Water Resources Planning 1 and Management: An Overviewpreserving natural ecosystems is essential to...

1Water Resources Planningand Management: An Overview

1.1 Introduction

Water resource systems have benefited bothpeople and their economies for many centuries.The services provided by such systems aremultiple. Yet in many regions of the world theyare not able to meet even basic drinking waterand sanitation needs. Nor can many of thesewater resource systems support and maintainresilient biodiverse ecosystems. Typical causesinclude inappropriate, inadequate and/or degra-ded infrastructure, excessive withdrawals of riverflows, pollution from industrial and agriculturalactivities, eutrophication resulting from nutrientloadings, salinization from irrigation returnflows, infestations of exotic plant and animals,excessive fish harvesting, flood plain and habitatalteration from development activities, andchanges in water and sediment flow regimes. Theinability of water resource systems to meet thediverse needs for water often reflect failures inplanning, management, and decision-making—and at levels broader than water. Planning,developing, and managing water resources toensure adequate, inexpensive, and sustainablesupplies and qualities of water for both humansand natural ecosystems can only succeed if werecognize and address the causal socioeconomicfactors, such as inadequate education, corruption,population pressures, and poverty.

Over the centuries, surface and ground watershave been a source ofwater supply for agricultural,municipal, and industrial consumers. Rivers haveprovided hydroelectric energy and inexpensive

ways of transporting bulk cargo. They have pro-vided people water-based recreational opportuni-ties and have been a source of water for wildlifeand their habitats. They have also served as ameans of transporting and transforming wasteproducts that are discharged into them. Thequantity and quality regimes of streams and rivershave been a major factor in governing the type,health, and biodiversity of riparian and aquaticecosystems. Floodplains have provided fertilelands for agricultural crop production and rela-tively flat lands for the siting of roads and railwaysand commercial and industrial complexes. Inaddition to the economic benefits that can bederived from rivers and their floodplains, the aes-thetic beauty of most natural rivers has made landsadjacent to them attractive sites for residential andrecreational development. Rivers and their flood-plains have generated, and, if managed properly,can continue to generate, substantial cultural,economic, environmental, and social benefits fortheir inhabitants.

Human activities undertaken to increase thebenefits obtained from rivers and their flood-plains may also increase the potential for costsand damages such as when the river is experi-encing periods of droughts, floods, and heavypollution. These costs and damages are physical,economic, environmental, and social. They resultbecause of a mismatch between what humansexpect or demand, and what nature offers orsupplies. Human activities tend to be based onthe “usual or normal” range of river flow con-ditions. Rare or “extreme” flow conditions

© The Author(s) 2017D.P. Loucks and E. van Beek, Water Resource Systems Planning and Management,DOI 10.1007/978-3-319-44234-1_1

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outside these normal ranges will continue tooccur, and possibly with increasing frequency asclimate change experts suggest. River-dependenthuman activities that cannot adjust to theseextreme flow conditions will incur losses.

The planning of human activities involvingrivers and their floodplains must consider certainhydrologic facts. One of these facts is that sur-face water flows and aquifer storage volumesvary over space and time. They are also finite.There are limits to the amounts of water that canbe withdrawn from them. There are also limits tothe amounts of pollutants that can be dischargedinto them. Once these limits are exceeded, theconcentrations of pollutants in these waters mayreduce or even eliminate the benefits that couldbe obtained from other users of the resource.

Water resources professionals have learnedhow to plan, design, build, and operate structuresthat together with nonstructural measuresincrease the benefits people can obtain from thewater resources contained in aquifers, lakes,rivers, and estuaries. However, there is a limit tothe services one can expect from these resources.Rivers, estuaries, and coastal zones under stressfrom over development and overuse cannot reli-ably meet the expectations of those depending onthem. How can these resources best be managedand used? How can this be accomplished in anenvironment of uncertain and varying suppliesand uncertain and increasing demands, and con-sequently of increasing conflicts among individ-uals having different interests in theirmanagement and use? The central purpose ofwater resources planning, management, andanalysis activities is to address, and if possibleanswer, these questions. These questions havescientific, technical, political (institutional), andsocial dimensions. Thus water resources plan-ning processes and products are must.

River basin, estuarine, and coastal zone man-agers—those responsible for managing theresources in those areas—are expected to managethose resources effectively and efficiently, meet-ing the demands or expectations of all users, andreconciling divergent needs. This is no small task,especially as demands increase, as the variability

of hydrologic and hydraulic processes becomemore pronounced, and as stakeholder expecta-tions of system performance increase in com-plexity. The focus or goal is no longer simply tomaximize economic net benefits while makingsure the distribution of those benefits is equitable.There are also environmental and ecologicalgoals to consider. Rarely are management ques-tions one-dimensional, such as how can we pro-vide, at acceptable costs, more high-quality waterto municipalities, industry, or to irrigation areas inthe basin. Now added to that question is howwould those withdrawals affect the downstreamhydrologic water quantity and quality regimes,and in turn the riparian and aquatic ecosystems.

Problems and opportunities change over time.Just as the goals of managing and using waterchange over time, so do the processes of plan-ning to meet these changing goals. Planningprocesses evolve not only to meet new demands,expectations, and objectives, but also in responseto new perceptions of how to plan and managemore effectively.

This chapter reviews some of the issuesrequiring water resources planning and manage-ment. It provides some context and motivationfor the following chapters that outline in moredetail our understanding of “how to plan” and“how to manage” and how computer-based pro-grams and models can assist those involved inthese activities. Additional information is avail-able in many of the references listed at the end ofthis chapter.

1.2 Planning and ManagementIssues: Some Case Studies

Managing water resources certainly requiresknowledge of the relevant physical sciences andtechnology. But at least as important, if not moreso, are the multiple institutional, social, orpolitical issues confronting water resourcesplanners and managers. The following briefdescriptions of some water resources planningand management studies at various geographicscales illustrate some of these issues.

2 1 Water Resources Planning and Management: An Overview

1.2.1 Kurds Seek Land, Turks WantWater

The Tigris and Euphrates Rivers (Fig. 1.1) cre-ated the “Fertile Crescent” where some of thefirst civilizations emerged. Today their waters arecritical resources, politically as well as geo-graphically. In one of the world’s largest publicworks undertakings, Turkey’s Southeast AnatoliaProject includes 13 irrigation and hydropowerschemes, and the construction of 22 dams and 19hydroelectric power plants on both the Tigris andthe Euphrates. Upon completion, it is expected toprovide up to 25% of the country’s electricity.

Its centerpiece, the Ataturk Dam (Fig. 1.2) onthe Euphrates River, is already completed. In thelake formed behind the dam, sailing and swim-ming competitions are being held on a spotwhere for centuries there was little more thandesert (Fig. 1.3).

When the multireservoir project is completedit is expected to increase the amount of irrigatedland in Turkey by 40% and provide up to a

quarter of the country’s electric power needs.Planners hope this can improve the standard ofliving of six million of Turkey’s poorest people,most of the Kurds, and thus undercut the appealof revolutionary separatism. It will also reducethe amount of water Syria and Iraq believe theyneed—water that Turkey fears might ultimatelybe used in anti-Turkish causes.

The region of Turkey where Kurd’s predom-inate is more or less the same region covered bythe Southeast Anatolia Project, encompassing anarea about the size of Austria. Giving that regionautonomy by placing it under Kurdish self-rulecould weaken the central Government’s controlover the water resource that it recognizes as akeystone of its future power.

In other ways also, Turkish leaders are usingtheir water as a tool of foreign as well as domesticpolicy. Among their most ambitious projectsconsidered is a 50-mile undersea pipeline to carrywater from Turkey to the parched Turkish enclaveon northern Cyprus. The pipeline, if actuallybuilt, will carry more water than northern Cyprus

Fig. 1.1 The Tigris and Euphrates Rivers in Turkey, northern Syria, and Iraq

1.2 Planning and Management Issues: Some Case Studies 3

Fig. 1.2 Ataturk Dam on the Euphrates River in Turkey (DSI)

Fig. 1.3 Water sports on Ataturk Reservoir on the Euphrates River in Turkey (DSI)


can use. Foreign mediators, frustrated by theirinability to break the political deadlock onCyprus, are hoping that the excess water can besold to the ethnic Greek republic on the southernpart of the island as a way of promoting peace.

As everyone knows, the Middle East is cur-rently (2016) witnessing considerable turmoil sowho knows the fate of any water resources projectin this region, including the one just described inTurkey and the following example in Jordan. Onecan only hope that the management and use ofthis scarce resource will lead to more peacefulresolutions of conflicts not only involving waterbut of other political issues as well.

1.2.2 Sharing the Water of theJordan River Basin: IsThere a Way?

A growing population—approximately 12 mil-lion people—and intense economic developmentin the Jordan River Basin (Fig. 1.4) are placingheavy demands on its scarce freshwater resour-ces. This largely arid region receives less than250 mm of rainfall each year, yet total water usefor agricultural and economic activities has beensteadily increasing. This plus encroaching urbandevelopment have degraded many sources ofhigh-quality water in the region.

The combined diversions by the riparian waterusers have changed the river in its lower courseinto little better than a sewage ditch. From the1300 million cubic meters (mcm) of water thatflowed into the Dead Sea in the 1950s only asmall fraction remains at present. In normal yearsthe flow downstream from Lake Tiberias (alsocalled the Sea of Galilee or Lake Kinneret) issome 60 million cubic meters (mcm)—about10% of the natural discharge in this section. Itmostly consists of saline springs and sewagewater. These flows are then joined by whatremains of the Yarmouk, by some irrigationreturn flows, and by winter runoff, adding up toan annual total of from 200–300 mcm. Both inquantity and quality this water is unsuitable forirrigation and does not sufficiently supply naturalsystems either. The salinity of the Jordan River

reaches up to 2000 parts per million (ppm) in thelowest section, which renders it unfit for cropirrigation. Only in flood years is fresh waterreleased into the lower Jordan Valley.

One result of this increased pressure on fresh-water resources is the deterioration of the region’swetlands. These wetlands are important for waterpurification and flood and erosion control. Asagricultural activities expand, wetlands are beingdrained, and rivers, aquifers, lakes, and streamsare being polluted with runoff containing fertiliz-ers and pesticides. Reversing these trends bypreserving natural ecosystems is essential to thefuture availability of fresh water in the region.

To ensure that an adequate supply of fresh,high-quality water is available for future gener-ations, Israel, Jordan, and the PalestinianAuthority will have to work together to preserveaquatic ecosystems (White et al. 1999). Withoutthese natural ecosystems, it will be difficult andexpensive to sustain high-quality water supplies.The role of ecosystems in sustaining water sup-plies has largely been overlooked in the contextof the region’s water supplies. Vegetation con-trols storm water runoff and filters polluted water,and it reduces erosion and the amount of sedi-ment that makes its way into water supplies.Streams assimilate wastewater, lakes store cleanwater, and surface waters provide habitat formany plants and animals.

The Jordan River Basin just like most riverbasins should be evaluated and managed as awhole system, to permit the comprehensiveassessment of the effects of water managementoptions on wetlands, lakes, the lower river, andthe Dead Sea coasts. Damage to ecosystems andloss of animal and plant species should beweighed against the potential benefits of devel-oping land and creating new water resources. Forexample, large river-management projects thatdivert water to dry areas have promoted intensiveyear-round farming and urban development, butavailable river water is declining and becomingincreasingly polluted. Attempting to meet currentdemands solely by withdrawing more groundand surface water could result in widespreadenvironmental degradation and depletion offreshwater resources.


There are policies that if implemented couldhelp preserve the capacity of the Jordan River tomeet future demands. Most of the options relateto improving the efficiency of water use—that is,they involve conservation and better use of pro-ven technologies. Also being considered arepolicies that emphasize economic efficiency andreduce overall water use. Charging higher ratesfor water use in peak periods, and surcharges forexcessive use, would encourage conservation. Inaddition, new sources of fresh water can beobtained by capturing rainfall through rooftopcisterns, catchment systems, and storage ponds.However before such measures are required, oneshould assess the impact on local aquiferrecharge, storage, and withdrawals.

Thus there are alternatives to a steady deteri-oration of the water resources of the Jordan Basin.They will require coordination and cooperation

among all those living in the basin. Will this bepossible?

1.2.3 Mending the “Mightyand Muddy” Missouri

Nearly two centuries after an epic expeditionthrough the Western US in search of a northwestriver passage to the Pacific Ocean, there is littleenchantment left to the Missouri River. Shown inFigs. 1.5 and 1.6, it has been dammed, diked,and dredged since the 1930s mainly to controlfloods and float cargo barges. The river nick-named the “Mighty Missouri” and the “BigMuddy” by its explorers is today neither mightynor muddy. The conservation group AmericanRivers perennially lists the Missouri among theUSA’s 10 most endangered rivers.

Fig. 1.4 The Jordan Riverbetween Israel and Jordan


Its wilder upper reaches are losing their cot-tonwood trees to dam operations and cattle thattrample seedlings along the river’s banks. Its vastmiddle contains multiple dams that hold backfloods, generate power, and provide pools forboats and anglers.

Its lower one-third is a narrow canal some-times called “The Ditch” that is deep enough for

commercial towboats. Some of the river’s banksare armored with rock and concrete retainingwalls that protect half a million acres of farmfields from flooding. Once those floods producedand maintained marshlands and side streams—habitats for a wide range of wildlife. Withoutthese habitats, many wild species are unable tothrive, and in some cases even survive.

Changes to restore at least some of the Missourito a more natural state are being implemented.These changes add protection of fish and wildlifehabitat to the list of objectives to be achieved by thegovernment agencies managing the Missouri. Theneeds of wildlife are now as important as othercompeting interests on the river including naviga-tion and flood control. This is in reaction, in part, tothe booming $115 million-a-year outdoor recre-ation industry. Just how much more emphasis willbe given to these back-to-nature goals depends onwhether the Missouri River Basin Association, anorganization representing eight states and 28NativeAmerican tribes, can reach a compromise with thetraditional downstream uses of the river.

Fig. 1.5 Major river basins in the continental US

Fig. 1.6 The Missouri Basin’s Reservoirs (not to scale)constructed for navigation and flood control


1.2.4 The Endangered Salmon

Greater Seattle in the northwestern US state ofWashington may be best known around theworld for Microsoft, but residents know it forsomething less flashy: its dwindling stock of wildsalmon. The Federal Government has placedseven types of salmon and two types of trout onits list of threatened or endangered species.Saving the fish from extinction could slow land

development in one of the fastest growingregions of the U.S.

Before the Columbia River and its tributaries inNWUS were blocked with dozens of dams, about10–16 million salmon made the annual run backup to their spawning grounds (Fig. 1.7). In 1996, alittle less than 1 million did. But the economy ofthe NW depends on the dams and locks that havebeen built in the Columbia that provide cheaphydropower production and navigation.

Fig. 1.7 The Snake and Columbia River reservoirs identified by the Columbia and Snake Rivers Campaign formodification or dismantling to permit salmon passage


For a long time, engineers tried to modify thesystem so that fish passage would be possible. Asshown in Fig. 1.8b, this included even the use oftrucks to transport captured juvenile salmonaround dams for release downstream. (It is notclear that the trucks will be there when the fishreturn to spawn upstream of the dams.) Thesemeasures have not worked all that well. Still toomany young fish enter the hydropower turbineson their way down the river. Now, as the debateover whether or not to remove some dams takes

place, fish are caught and trucked around theturbines. The costs of keeping these salmonalive, if not completely happy, are enormous.

Over a dozen national and regional environ-mental organizations have joined together tobring back salmon and steelhead by modifying orpartially dismantling five federal dams on theColumbia and Snake Rivers. Partial removal ofthe four dams on the lower Snake River inWashington State and lowering the reservoirbehind John Day dam on the Columbia bordering

Fig. 1.8 A salmonswimming upstream(a) and measures taken toprotect young juvenilesalmon pass byhydropower dams on theirway downstream (b) (USFish and Wildlife Serviceand US Army Corps ofEngineers, Pacific region)


Oregon and Washington (see Fig. 1.8) shouldhelp restore over 200 miles of vital river habitat.Running the rivers more like rivers may returnsalmon and steelhead to harvestable levels of the1960s before the dams were built.

Dismantling part of the four Lower Snakedams will leave most of each dam whole. Onlythe dirt bank connecting the dam to the riverbankwill be removed. The concrete portion of the damwill remain in place, allowing the river to flowaround it. The process is reversible and, theCampaign argues, it will actually save taxpayersmoney in planned dam maintenance, by elimi-nating subsidies to shipping industries andagribusinesses, and by ending current salmonrecovery measures that are costly. Only partiallyremoving the four Lower Snake River dams andmodifying John Day dam will help restore rivers,save salmon, and return balance to the North-west’s major rivers.

1.2.5 Wetland Preservation:A Groundswell of Supportand Criticism

The balmy beach community of Tiger Pointnear Pensacola, Florida, bordering the Gulf ofMexico, is booming with development. Newsubdivisions, a Wal-Mart discount retail storeand a recreation center dot the landscape.

Most—if not all—of this neighborhood wasonce a wetland that soaked up rain duringdownpours. Now, water runs off the parking lotsand the roofs and into resident’s living rooms.Some houses get flooded nearly every year.

A federal agency oversees wetland develop-ment. Critics say the agency is permitting in thisarea one of the highest rates of wetland loss in thenation. Obviously local developers wish they didnot have to deal with the agency at all. The ten-sion in Tiger Point reflects the debate throughoutthe US about whether the government is doingenough—or too much—to protect the nation’senvironment, and in this case, its wetlands.

Environmentalists and some homeownersvalue wetlands because they help reduce waterpollution and floods, as well as nurture a diversewildlife population. But many landowners anddevelopers see the open wetlands as prime ter-ritory for building houses and businesses, ratherthan for breeding mosquitoes. They view exist-ing federal wetland rules as onerous, illogical,and expensive.

While some areas such as Tiger Point haveresidents who want stricter laws to limit wetlandsdevelopment, others—such as the suburbsaround Seattle—have people who long for lessstrict rules.

Federal regulators had tried to quell the con-troversy with a solution known as wetlands miti-gation. Anyonewho destroys awetland is requiredto build or expand another wetland somewhereelse. Landowners and developers also see miti-gation as away out of the torturous arguments overwetlands. However, studies have shown manyartificial marshes do not perform as well as thosecreated by nature (NRC 2001). Many of the new,artificial wetlands are what scientists call the “ringaround the pond” variety: open water surroundedby cattails. Furthermore, the federal agency issu-ing permits for wetland replacement do not havethe resources to monitor them after they areapproved. Developers know this.

1.2.6 Lake Source Cooling:Aid to Environment,or Threat to Lake?

It seems to be an environmentalist’s dream: acost-effective system that can cool some10 million square feet of high school anduniversity buildings simply by pumping coldwater from the depths of a nearby lake (Fig. 1.9).No more chlorofluorocarbons, the refrigerantsthat can destroy protective ozone in the atmo-sphere and at a cost substantially smaller than forconventional air conditioners. The lake water isreturned to the lake, with a few added calories.


However, a group of local opponents insiststhat Cornell University’s $55 million lake-source-cooling plan that replaced its aging air condition-ers is actually an environmental threat. Theybelieve it could foster algal blooms. Pointing to 5years of studies, thousands of pages of data, andmore than a dozen permits from local and stateagencies, Cornell’s consultants say the systemcould actually improve conditions in the lake. Yetanother benefit, they say, is that the system wouldreduce Cornell’s contribution to global warmingby reducing the need to burn coal to generateelectricity.

For the most part, government officials agree.But a small determined coalition of critics fromthe local community argue over the expected

environmental impacts, and over the process thattook place in getting the required local, state, andfederal permits approved. This is in spite of thefact that the planning process, that took over5 years, requested and involved the participationof all interested stakeholders (that would partic-ipate) from the very beginning. Even the localSierra Club chapter and biology professors atother universities have endorsed the project.However, in almost every project where theenvironmental impacts are uncertain, there willbe debates among scientists as well as stake-holders. In addition, a significant segment ofsociety distrusts scientists anyway. “This is amajor societal problem,” wrote a professor andexpert in the dynamics of lakes. “A scientist says

Fig. 1.9 The cold deep waters of Lake Cayuga are being used to cool the buildings of a local school and university(Ithaca City Environmental Laboratory)


X and someone else says Y and you’re got chaos.In reality, we are the problem. Every time weflush our toilets, fertilize our lawns, gardens andfields, or wash our cars we contribute to thenutrient loading of the lake.”

The project has now been operating for over adecade, and so far no adverse environmentaleffects have been noticed at any of the manymonitoring sites.

1.2.7 Managing Water in the FloridaEverglades

The Florida Everglades (Fig. 1.10) is the largestsingle wetland in the continental United States.In the mid-1800s it covered a little over ninemillion acres, but since that time the historicalEverglades has been drained and half of the areadevoted to agriculture and urban development.The remaining wetland areas have been alteredby human disturbances both around and withinthem. Water has been diverted for human uses,flows have been lowered to protect againstfloods, nutrient supplies to the wetlands fromrunoff from agricultural fields and urban areashave increased, and invasions of nonnative orotherwise uncommon plants and animals haveout-competed native species. Populations ofwading birds (including some endangered spe-cies) have declined by 85–90% in the lasthalf-century, and many species of South Flor-ida’s mammals, birds, reptiles, amphibians, andplants are either threatened or endangered.

The present management system of canals,pumps, and levees (Fig. 1.11) will not be able toprovide adequate water supplies to agriculturaland urban areas, or sufficient flood protection,let alone support the natural (but damaged)ecosystems in the remaining wetlands. The sys-tem is not sustainable. Problems in the greaterEverglades ecosystem relate to both water qualityand quantity, including the spatial and temporal

distribution of water depths, flows, and floodingdurations—called hydroperiods. Issues arisebecause of variations from the natural/historicalhydrologic regime, degraded water quality, andthe sprawl from fast-growing urban areas.

To meet the needs of the burgeoning popula-tion and increasing agricultural demands forwater, and to begin the restoration of Everglades’aquatic ecosystem to a more natural regime, anambitious plan has been developed by the U.S.Army Corps of Engineers and its local sponsor,the South Florida Water Management District.The proposed Corps plan is estimated to cost over$8 billion. The plan and its EnvironmentalImpact Statement (EIS) have received input frommany government agencies and nongovernmentalorganizations, as well as from the public at large.

The plan to restore the Everglades is ambi-tious and comprehensive, involving change ofthe current hydrologic regime in the remnantEverglades to one that resembles a more naturalone, reestablishment of marshes and wetlands,implementation of agricultural best managementpractices, enhancements for wildlife and recre-ation, and provisions for water supply and floodcontrol.

Planning for and implementing the restorationeffort requires application of state-of-the-art largesystems analysis concepts, hydrological andhydroecological data and models incorporatedwithin decision support systems, integration ofsocial sciences, and monitoring for planning andevaluation of performance in an adaptive man-agement context. These large, complex chal-lenges of the greater Everglades restoration effortdemand the most advanced, interdisciplinary,and scientifically sound analysis capabilities thatare available. They also require the political willto make compromises and to put up with thelawsuits by anyone possibly disadvantaged bysome restoration measure.

Who pays for all this? The taxpayers ofFlorida and the taxpayers of the U.S.


Fig. 1.10 Scenes of theEverglades in southernFlorida (South FloridaWater ManagementDistrict)


1.2.8 Restoration of Europe’s Riversand Seas

1.2.8.1 North and Baltic SeasThe North and Baltic Seas (shown in Fig. 1.12)are the most densely navigated seas in the world.Besides shipping, military, and recreational uses,an offshore oil industry and telephone cablescover the seabed. The seas are rich and produc-tive with resources that include not only fish butalso crucial minerals (in addition to oil) such asgas, sand, and gravel. These resources andactivities play major roles in the economies of thesurrounding countries.

Being so intensively used and surrounded byadvanced industrialized countries, pollutionproblems are serious. The main pollution sourcesinclude various wastewater outfalls, dumping byships (of dredged materials, sewage sludge, andchemical wastes) and operational dischargesfrom offshore installations. Deposition of atmo-spheric pollutants is an additional major sourceof pollution.

Those parts of the seas at greatest risk frompollution are where the sediments come to rest,where the water replacement is slowest andwhere nutrient concentrations and biologicalproductivity are highest. A number of warningsignals have occurred.

Algal populations have changed in numberand species. There have been algal blooms,caused by excessive nutrient discharge from landand atmospheric sources. Species changes showa tendency toward more short-lived species ofthe opportunistic type and a reduction, some-times to the point of disappearance, of somemammals and fish species and the sea grasscommunity. Decreases of ray, mackerel, sand eel,and echinoderms due to eutrophication haveresulted in reduced plaice, cod, haddock and dab,mollusk and scoter.

The impact of fishing activities is also con-siderable. Sea mammals, sea birds, and Balticfish species have been particularly affected by thewidespread release of toxins and pollutantsaccumulate in the sediments and in the food web.

Fig. 1.11 Pump station on a drainage canal in southern Florida (South Florida Water Management District)


Fig. 1.12 Europe’s major rivers and seas


Some animals, such as the gray seal and the seaeagle, are threatened with extinction.

Particular concern has been expressed aboutthe Wadden Sea that serves as a nursery for manyNorth Sea species. Toxic PCB contamination, forexample, almost caused the disappearance ofseals in the 1970s. Also, the 1988 massive sealmortality in the North and Wadden Seas,although caused by a viral disease, is still thoughtby many to have a link with marine pollution.

Although the North Sea needs radical andlengthy treatment it is probably not a terminalcase. Actions are being taken by borderingcountries to reduce the discharge of wastes intothe sea. A major factor leading to agreements toreduce discharges of wastewaters has been theverification of predictive pollutant circulationmodels of the sea that identify the impacts ofdischarges from various sites along the seaboundary.

1.2.8.2 The RhineThe map of Fig. 1.13 shows the areas of the ninecountries that are part of river Rhine basin. In theDutch area of the Rhine basin, water is partlyrouted northward through the IJssel and west-ward through the highly interconnected riversystems of the Rhine, Meuse, and Waal.

About 55 million people live in the RhineRiver basin and about 20 million of those peopledrink the river water.

In the mid 1970s, some called the Rhine themost romantic sewer in Europe. In November1986, a chemical spill degraded much of theupper Rhine’s aquatic ecosystem. This damagingevent was reported worldwide. The Rhine wasagain world news in the first 2 months of 1995,when its water level reached a height that occurson average once in a century. In the Netherlands,some 200,000 people, 1,400,000 pigs and cows,and 1,000,000 chickens had to be evacuated.During the last 2 months of the same year therewas hardly enough water in the Rhine for navi-gation. It is fair to say these events have focusedincreased attention on what needs to be done to“restore” and protect the Rhine.

To address just how to restore the Rhine, it isuseful to look at what has been happening to the

river during the past 150 years. The Rhine wasoriginally a natural watercourse. It is the onlyriver connecting the Alps with the North Sea. Toachieve greater economic benefits from the river,it was engineered for navigation, hydropower,water supply, and flood protection. Flood plainsnow “protected” from floods, provided increasedland areas suitable for development. The mainstream of the Rhine is now considerably shorterand narrower and deeper than it was originally.

From an economic development point ofview, the engineering works implemented in theriver and its basin worked. The Rhine basin isnow one of the most industrialized regions in theworld. The basin is characterized by intensiveindustrial and agricultural activities. Some 20%of the world’s chemical industry is located in theRhine River basin. The River is reportedly thebusiest shipping waterway in the world, con-taining long canals with regulated water levels.These canals connect the Rhine and its tributarieswith the rivers of almost all the surrounding riverbasins including the Danube River. This provideswater transport to and from the North and BlackSeas.

From an environmental and ecological view-point, and from the viewpoint of flood control aswell, the economic development that has takenplace over the past two centuries has not workedperfectly. The concerns growing from the recenttoxic spill and floods as from a generallyincreasing interest by the inhabitants of the basinin environmental and ecosystem restoration andthe preservation of natural beauty, has resulted inbasin-wide efforts to rehabilitate the basin to amore “living” sustainable entity.

A Rhine Action Programme was created torevive the ecosystem. The goal of that program isthe revival of the main stream as the backbone ofthe ecosystem, particularly for migratory fish,and the protection, maintenance, and the revivalof ecologically important areas along the Rhine.The plan, implemented in the 1990s, was giventhe name “Salmon 2000”. The return of salmonto the Rhine is seen as a symbol of ecologicalrevival. A healthy salmon population will need toswim throughout the river length. This will posea challenge, as no one pretends that the


Fig. 1.13 The Rhine River Basin of Western Europe and its extension in The Netherlands


engineering works that provide navigation andhydropower benefits, but which also inhibit fishpassage, are no longer needed or desired.

1.2.8.3 The DanubeThe Danube River (shown in Fig. 1.14) is in theheartland of Central Europe. Its basin includes toa larger extent the territories of 15 countries. Itadditionally receives runoff from small catch-ments located in four other countries. About90 million people live in the basin. This riverencompasses perhaps more political, economic,and social variations than arguably any otherriver basin in Europe.

The river discharges into the Black Sea. TheDanube delta and the banks of the Black Seahave been designated a Biosphere Reserve byUNESCO. Over half of the Delta has beendeclared a “wet zone of international signifi-cance.” Throughout its length the Danube Riverprovides a vital resource for drainage, commu-nications, transport, power generation, fishing,

recreation, and tourism. It is considered to be anecosystem with irreplaceable environmentalvalues.

More than 40 dams and large barrages plusover 500 smaller reservoirs have been con-structed on the main Danube River and itstributaries. Flood control dikes confine most ofthe length of the main stem of the Danube Riverand the major tributaries. Over the last 50 yearsnatural alluvial flood plain areas have declinedfrom about 26,000 km2 to about 6000 km2.

There are also significant reaches with rivertraining works and river diversion structures.These structures trap nutrients and sediment inthe reservoirs. This causes changes in down-stream flow and sediment transport regimes thatreduce the ecosystems’ habitats both longitudi-nally and transversely, and decrease the effi-ciency of natural purification processes. Thuswhile these engineered facilities provide impor-tant opportunities for the control and use of theriver’s resources, they also illustrate the

Munich

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Germany CzechRepublic

Slovak Republic Ukraine

Moldava

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Fig. 1.14 The Danube River in Central Europe


difficulties of balancing these important eco-nomic activities with environmentally sound andsustainable management.

The environmental quality of the Danube Riveris also under intense pressure from a diverse rangeof human activities, including point source andnonpoint source agricultural, industrial, andmunicipal wastes. Because of the poor waterquality (sometimes affecting human health) theriparian countries of the Danube river basin havebeen participating in environmental managementactivities on regional, national, and local levels forseveral decades. All Danube countries signed aformal Convention on Cooperation for the Pro-tection and Sustainable Use of theDanubeRiver inJune 1994. The countries have agreed to take “…all appropriate legal, administrative and technicalmeasures to improve the current environmentaland water quality conditions of the Danube Riverand of the waters in its catchment area and toprevent and reduce as far as possible adverseimpacts and changes occurring or likely to becaused.”

1.2.9 Flood Managementon the Senegal River

As on many rivers in the tropical developingworld, dam constructions on the Senegal (andconventional dam management strategies) canchange not only the riverine environment but also

the social interactions and economic productivityof farmers, fishers, and herders whose livelihoodsdepend on the annual flooding of valley bottom-lands. Although much of the Senegal River flowsthrough a low rainfall area, the naturally occur-ring annual flooding supported a rich and bio-logically diverse ecosystem. Living in asustainable relationship with their environment,small-land holders farmed sandy uplands duringthe brief rainy season, and then cultivated the clayplains as floodwaters receded to the main channelof the river. Livestock also benefited from thesuccession of rain-fed pastures on the uplands andflood-recession pastures on the plains. Fish wereabundant. As many as 30,000 tons were caughtyearly. Since the early 1970s, small irrigated riceschemes added a fifth element to the productionarray: rain-fed farming, recession farming, herd-ing, fishing, and irrigation.

Completion of the Diama salt intrusion barragenear the mouth of the river between Senegal andMauritania and Manantali High Dam more than1000 km upstream in Mali (Fig. 1.15), and thetermination of the annual flood have had adverseeffects on the environment. Rather than insulatingthe people from the ravages of drought, the damrelease policy can accelerate desertification andintensify food insecurity. Furthermore, anticipa-tion of donor investments in huge irrigationschemes has, in this particular case, lead to theexpulsion of non-Arabic-speaking black Mauri-tanians from their floodplain lands.

Fig. 1.15 Senegal Riverand its Manantali Reservoirmore than 1000 kmupstream in Mali


This is a common impact of dam construction:increased hardships of generally politically pow-erless people in order that urban and industrialsectors may enjoy electricity at reduced costs.

Studies in the Senegal Valley by anthropolo-gists, hydrologists, agronomists, and others sug-gest that it may be entirely economically feasibleto create a controlled annual “artificial flood,”assuring satisfaction of both urban, industrial,and rural demands for the river’s water andsupporting groundwater recharge, reforestation,and biodiversity.

Because of these studies, the government ofSenegal ended its opposition to an artificial flood,and its development plans for the region are nowpredicated on its permanence. However, due tothe common belief that releasing large quantitiesof water to create an artificial flood is incompat-ible with maximum hydropower production, theother members of the three-country consortiummanaging the dams—Mali and Mauritania—haveresisted accepting this policy.

1.2.10 Nile Basin Countries Strivingto Share Its Benefits

The Nile River (Fig. 1.16) is one of the majorrivers of the world, serving millions and givingbirth to entire civilizations. It is one of the world’slongest rivers, traversing about 6695 km from thefarthest source of its headwaters in Rwanda andBurundi through Lake Victoria, to its delta inEgypt on the Mediterranean Sea. Its basinincludes 11 African countries (Burundi, DRCongo, Egypt, Eritrea, Ethiopia, Kenya, Rwanda,South Sudan, The Sudan, and Tanzania) andextends for more than 3 million square kilometerswhich represents about 10% of Africa’s land massarea. The basin includes the Sudd wetland systemin South Sudan.

Nile Basin countries are today home to morethan 437 million people and of these, 54%(238 million) live within the basin and expectbenefits from the management and use of theshared Nile Basin water resources.

Notwithstanding the basin’s natural andenvironmental endowments and rich culturalhistory, its people face considerable challengesincluding persistent poverty with millions livingon less than a dollar a day; extreme weatherevents associated with climate variability andchange such as floods and droughts; low accessto water and sanitation services; deterioratingwater quality; and very low access rate to modernenergy with most countries below 20% accesslevel. The region also has a history of tensionsand instability both between states and internal tostates.

Cooperative management and developmentcould bring a vast range of benefits includingincreased hydropower and food production; bet-ter access to water for domestic use; improvedmanagement of watersheds and reduced envi-ronmental degradation; reduced pollution andmore control over damage from floods anddroughts. Recognizing this the Nile Basin Ini-tiative was created as a regional intergovern-mental partnership that seeks to develop theRiver Nile in a cooperative manner, share sub-stantial socioeconomic benefits, and promoteregional peace and security. The partnershipincludes 10 Member States namely Burundi, DRCongo, Egypt, Ethiopia, Kenya, Rwanda, SouthSudan, The Sudan, Tanzania, and Uganda. Eri-trea participates as an observer. NBI was con-ceived as a transitional institution until apermanent institution can be created.

The partnership is guided by a SharedVision: “To achieve sustainable socio-economicdevelopment through equitable utilization of,and benefit from, the common Nile Basin Waterresources.” The shared belief is that countriescan achieve better outcomes for all the peoplesof the Basin through cooperation rather thancompetition. It is supported by a “Shared VisionPlanning Model” built by experts from all thebasin countries. The model is designed to rundifferent scenarios and assess the basin-wideimpacts of different management policies andassumptions that any country may wish toperform.


0 300 km

E030

127n

Mediterranean Sea

Nile

Lake Nasser

Khartoum

Addis Ababa

Sudan

Ethiopia

Uganda

Blue Nile

Egypt

2 001 00

Cairo

High Aswan Dam

Kampala

Jebel Aulia Khashm El Girba

Sennar

Owen Falls

Lake Tana

Sobat

LakeKyoga

LakeAlbert

LakeEdward

Macharswamp

Suddswamp

Ghazalswamp

Libya

ChadEritrea

CentralAfricanRepublic

KenyaDemocraticRepublic of Congo

Tanzania

Rwanda

Burundi

LakeVictoria

Gha

Bahr

z

BahrElArab

Elal

Jordan

Saudi Arabia

Israel/Palestine

WhiteNile

JongleiCanal

Africa

Atbara

Tekeze

Rumela/Burdana

Merowe

existing damdam underconstruction

SyriaIraq

Lebanon

Malakal

Red Sea

IndianOcean

Renaissance

Roseires

Fig. 1.16 The Nile River Basin


1.2.11 Shrinking Glaciers at Topof the World

As shown in Fig. 1.17, Tibet lies north of India,Nepal, Bhutan, and Myanmar, west of China, andsouth of East Turkistan. The highest and largestplateau on Earth, it stretches some 1500 miles(2400 km) from east to west, and 900 miles(1448 km) north to south, an area equivalent insize to the United States region east of the Mis-sissippi River. The Himalayas form much of itssouthern boundary, and Tibet’s average altitude isso high—11,000 feet (3350 km) above sealevel—that visitors often need weeks to acclimate.

The Tibetan Plateau serves as the headwatersfor many of Asia’s largest rivers, including theYellow, Yangtze, Mekong, Brahmaputra, Sal-ween, and Sutlej, among others. A substantialportion of the world’s population lives in thewatersheds of the rivers whose sources lie on theTibetan Plateau.

Recent studies—including several by theChinese Academy of Sciences—have docu-mented a host of serious environmental chal-lenges involving the quantity and quality ofTibet’s freshwater reserves, most of them causedby industrial activities. Deforestation has led tolarge-scale erosion and siltation. Mining, manu-facturing, and other human and industrial activ-ities are producing record levels of air and waterpollution in Tibet, as well as elsewhere in China

(Wong 2013). Together, these factors portendfuture water scarcity that could add to theregion’s political volatility.

Most important is that the region’s glaciers arereceding at one of the fastest rates anywhere inthe world, and in some regions of Tibet by three3 m per year (IPPC 2007). The quickeningmelting and evaporation is raising serious con-cerns in scientific and diplomatic communities,in and outside China, about Tibet’s historiccapacity to store more freshwater than anyplaceon earth, except the North and South Poles.Tibet’s water resources, they say, have becomean increasingly crucial strategic political andcultural element that the Chinese are intent onmanaging and controlling.

1.2.12 China, a Thirsty Nation

Why does China care about the freshwater inTibet? With more than a quarter of its landclassified as desert, China is one of the planet’smost arid regions. Beijing is besieged each springby raging dust storms born in Inner Mongoliawhere hundreds of square miles of grasslands areturning to desert each year. In other parts of thenation, say diplomats and economic developmentspecialists, Chinese rivers are either too pollutedor too filled with silt to provide all of China’speople with adequate supplies of freshwater.

Fig. 1.17 China, India,and Southeast Asia,highlighting the TibetanPlateau


Chinese authorities have long had their eyeson Tibet’s water resources. They have proposedbuilding dams for hydropower and spendingbillions of dollars to build a system of canals totap water from the Himalayan snowmelt andglaciers and transport it hundreds of miles northand east to the country’s farm and industrialregions.

But how long that frozen reservoir will last isin doubt. In attempting to solve its own watercrisis, China could potentially create widespreadwater shortages among its neighbors.

While the political issues involving Tibet arecomplex, there is no denying that water plays arole in China’s interest in the region. The waterof Tibet may prove to be one of its mostimportant resources in the long run—for China,and for much of southern Asia. Figuring out howto sustainably manage that water will be a key toreducing political conflicts and tensions in theregion.

1.2.13 Managing Sediment in China’sYellow River

The scarcity of water is not the only issue Chinahas to address. So is sediment, especially in theYellow River (Fig. 1.18). The Yellow River basinis the cradle of Chinese civilization, with agri-cultural societies appearing on the banks of theriver more than 7000 years ago. The YellowRiveroriginates in the Qinghai–Tibetan plateau anddischarges into the Bohai Gulf in the Yellow sea.The basin is traditionally divided into the upper,middle, and lower reaches, which can be descri-bed as three down-sloping steps: the TibetanPlateau, the Loess Plateau, and the alluvial plain.Key management issues are many, but the mostvisible one is sediment (Figs. 1.19 and 1.20).

The high sediment load of the Yellow River isa curse if the sediment deposits on the bed of thechannel and reduces its capacity, therebyincreasing the risk of flooding. Also, rapiddeposition of sediment in reservoirs situatedalong the river is a problem as it reduces theireffectiveness for flood control and water storage.

Another major management issue is theecosystem health of the river. The relative scar-city of water creates a tension between allocatingwater for the benefit of river health, and for directsocial and economic benefit. Irrigation uses 80%of the water consumed from the river, with therest supplying industry, and drinking water forcities along the river and outside of the basin(Tianjin, Cangzhou and Qingdao). During the1980s and 1990s the lower river dried up nearlyevery year, resulting in lost cereal production,suspension of some industries, and insufficientwater supplies for more than 100,000 residents,who had to queue daily for drinking water. Aswell as costing around RmB40 billion in lostproduction, there was a serious decline in theecological health of the river.

The diversity of habitat types and extensiveareas of wetlands within the Ramsar-listed Yel-low River Delta support at least 265 bird species.The birds, fish, and macroinvertebrates in thedelta rely on healthy and diverse vegetationcommunities, which in turn depend upon onannual freshwater flooding and the associatedhigh sediment loads. Degradation of theecosystem of the Delta has been documented,especially from the late-1990s, due to increasedhuman activities and a significant decrease in theflow of freshwater to the Delta wetlands. This hasled to saltwater intrusion and increased soilsalinity. Restoration activities involving theartificial delivery of freshwater to the wetlandsbegan in 2002.

1.2.14 Damming the Mekong(S.E. Asia), the Amazon,and the Congo

The world’s most biodiverse river basins—theAmazon, Congo, and Mekong—are attractinghydropower developers. While hydropower pro-jects address energy needs and offer the potentialof a higher standard of living, they also canimpact the river’s biodiversity, especially fish-eries. The Amazon, Congo, and Mekong basinshold roughly one-third of the world’s freshwater


fish species, most of which are not found else-where. Currently more than 450 additional damsare planned for these three rivers (see Figs. 1.22and 1.23) (Winemiller et al. 2016). Many of thesites most appropriate for hydropower productionalso are the habitats of many fish species. Givenrecent escalation of hydropower development inthese basins, planning is needed to reduce bio-diversity loss, as well as other adverse environ-mental, social, and economic impacts whilemeeting the energy needs of the basins.

The Mekong River (Fig. 1.21) flows some4200 km through Southeast Asia to the SouthChina Sea through Tibet, Myanmar (Burma),Vietnam, Laos, Thailand, and Cambodia. Its“development” has been restricted over the past

several decades due to regional conflicts, indeedconflicts that have altered the history of the world.Now that these conflicts are not resulting in mil-itary battles (at this writing), investment capital isbecoming available to develop the Mekong’sresources for improved fishing, irrigation, floodcontrol, hydroelectric power, tourism, recreation,and navigation. The potential benefits are sub-stantial, but so are the environmental, ecological,and social risks (Orr et al. 2012).

The economic value of hydroelectric powercurrently generated from the Mekong brings inwelcome income however the environmentalimpacts are harder to quantify. Today some60 million people (12 million households) live inthe Lower Mekong Basin, and 80% rely directly

Fig. 1.18 The Yellow River Basin in China


on the river system for their food and livelihoods.Most of these households would be affected byalterations to fish availability since fish is theirmain source of dietary protein. The food securityimpacts on these people due to the existing andproposed dam building and operation in Cam-bodia, Laos, Thailand, and Vietnam remain rel-atively unexplored. Dam builders have oftenfailed to recognize, or wish to ignore, the crucialrole of inland fisheries in meeting food securityneeds.

During some months of the year the lack ofrainfall causes the Mekong to fall dramatically.Salt water may penetrate as much as 500 kminland. In other months the flow can be up to30 times the low flows, causing the water in theriver to back up into wetlands and flood some12,000 km2 of forests and paddy fields in the

Vietnamese delta region alone. The ecology of amajor lake, Tonle Sap, in Cambodia depends onthese backed up waters.

While flooding imposes risks on the inhabi-tants of the Mekong flood plain, there are alsodistinct advantages. High waters depositnutrient-rich silts on the low-lying farmlands,thus sparing the farmers from having to transportand spread fertilizers on their fields. Also, shal-low lakes and submerged lands provide spawn-ing habitats for about 90% of the fish in theMekong basin. Fish yield totals over half a mil-lion tons annually.

What will happen to the social fabric and to thenatural environment if the schemes to build bigdams (see Fig. 1.22a) across the mainstream ofthe Mekong are implemented? Depending ontheir design, location, and operation, they could

Fig. 1.19 Sediment flows in China’s Yellow River. http://yellowriver-china.blogspot.com/2011/09/book-review-on-flood-discharge-and.html


http://yellowriver-china.blogspot.com/2011/09/book-review-on-flood-discharge-and.html

http://yellowriver-china.blogspot.com/2011/09/book-review-on-flood-discharge-and.html

disrupt the current fertility cycles and the habitatsand habits of the fish in the river resulting fromthe natural flow and sediment regimes. Increasederosion downstream from major reservoirs is alsoa threat. Add to these possible adverse impactsthe need to evacuate and resettle thousands ofpeople displaced by the lake behind the dams.How will they be resettled? And how long will ittake them to adjust to new farming conditions?And will there even be a Delta? Together with sealevel rise and a blockage of Mekong’s sediment to

the Delta, its survival as a geologic feature, and asa major source of food, is in doubt.

There have been suggestions that a proposeddam in Laos could cause deforestation in awilderness area of some 3000 km2. Much of thewildlife, including elephants, big cats, and otherrare animals, would have to be protected if theyare not to become endangered. Malaria-carryingmosquitoes, liver fluke, and other disease bearersmight find ideal breeding grounds in the mudflats of the shallow reservoir. These are among

Fig. 1.20 Dams can bedesigned and operated toremove some of thesediment that is trapped inthe upstream reservoir


Fig. 1.21 The Lower Mekong River Basin including Tonle Sap Lake in Cambodia and the Mekong Delta in Vietnam


the types of issues that need to be considerednow that increased development seems likely.

Similar issues face those who are planningsimilar hydropower dam developments in the othertwo most biodiverse river basins in the world—theAmazon and the Congo (Fig. 1.23). Clarifying thetrade-offs between energy (economic), environ-mental, and social goals can inform governmentsand funding institutions as they make their damsiting, design, and operating decisions.

Hydropower accounts for more thantwo-thirds of Brazil’s energy supply, and over300 new Amazon dams have been proposed.Impacts of these dams would extend beyonddirect effects on rivers to include relocation of

human populations and expanding deforestationassociated with new roads. Scheduled for com-pletion in 2016, Brazil’s Belo Monte hydropowercomplex was designed with installed capacity of11,233 MW, ranking it the world’s third largest.But it could also set a record for biodiversity lossowing to selection of a site that is the sole habitatfor many species. The Congo has far fewer damsthan the Amazon or Mekong, yet most powergenerated within the basin is from hydropower.Inga Falls, a 14.5-km stretch of the lower Congothat drops 96 m to near sea level, has greaterhydropower potential than anywhere else. TheInga I and II dams, constructed in the 1970s and1980s, currently yield 40% of the 2132-MWinstalled capacity. Planned additional dams (IngaIII and Grand Inga) would harness as much as83% of the Congo’s annual discharge, with mostof the energy to be exported. Grand Inga woulddivert water and substantially reduce flow for atleast 20 km downstream from the falls. Again,many trade-offs involved with dam building, andall calling for comprehensive systems planningand analyses to identify them.

1.3 So, Why Plan, Why Manage?

Water resources planning and managementactivities are usually motivated, as they were ineach of the previous section’s case examples, bythe realization that there are problems to solveand/or opportunities to obtain increased benefitsby changing the management and use of waterand related land resources. These benefits can bemeasured in many different ways. The best wayto do it is often not obvious. Whatever way isproposed may provoke conflict. Hence there isthe need for careful study and research, as well asfull stakeholder involvement, in the search forthe best compromise plan or management policy.

Reducing the frequency and/or severity of theadverse consequences of droughts, floods, andexcessive pollution are common goals of manyplanning and management exercises. Other rea-sons include the identification and evaluation ofalternative measures that may increase theavailable water supplies, hydropower, improve

Fig. 1.22 Lancang/Mekong River where reservoirs arebeing planned on the river itself (a) and on many of itstributaries (b). a http://khmerization.blogspot.com/2013/10/wwf-expresses-alarm-over-laos-decision.html, 6/10/13, and b reprinted from Wild and Loucks 2014, withpermission. © 2014. American Geophysical Union


http://khmerization.blogspot.com/2013/10/wwf-expresses-alarm-over-laos-decision.html

http://khmerization.blogspot.com/2013/10/wwf-expresses-alarm-over-laos-decision.html

Fig. 1.22 (continued)

1.3 So, Why Plan, Why Manage? 29

recreation and/or navigation, and enhance waterquality and aquatic ecosystems. Quantitativesystem performance criteria can help one judgethe relative net benefits, however measured, ofalternative plans and management policies.

System performance criteria of interest haveevolved over time. They have ranged from beingprimarily focused on safe drinking water just acentury ago to multipurpose economic develop-ment a half-century ago to goals that now includeenvironmental and ecosystem restoration andprotection, aesthetic and recreational experi-ences, and more recently, sustainability (ASCE1998; GTT 2014).

Some of the multiple purposes served by ariver can be conflicting. A reservoir used solelyfor hydropower, or water supply, is better able tomeet its objectives when it is full of water. On theother hand, a reservoir used solely for down-stream flood control is best left empty so it canstore more of the flood flows when they occur.A single reservoir serving all three purposesintroduces conflicts over how much water tostore in it and discharge from it, i.e., how itshould be operated. In basins where diversion

demands exceed the available supplies, conflictswill exist over water allocations. Finding the bestway to manage, if not resolve, these conflicts arereasons for planning.

1.3.1 Too Little Water

Issues involving inadequate supplies to meetdemands can result from too little rain or snow.They can also result from patterns of land andwater use. They can result from growing urban-ization, the growing needs to meet instream flowrequirements, and conflicts over private propertyand public rights regarding water allocations.Other issues can involve transbasin water trans-fers and markets, objectives of economic effi-ciency versus the desire to keep nonefficientactivities viable, and demand management mea-sures, including incentives for water reuse andwater reuse financing.

Measures to reduce the demand for water intimes of supply scarcity should be identified andagreed upon before everyone must cope with anactual water scarcity. The institutional authority

Fig. 1.23 Fish diversity and dam locations in theAmazon and Congo basins. In addition to basin-widebiodiversity summaries (upper left), each basin can bedivided into ecoregions (white boundaries). Approximate

number of species (black numbers) and the total speciesrichness (shades of green) found in ecoregions differwidely (Winemiller et al. 2016)


to implement drought measures when their des-ignated “triggers”—such as storage volumes inreservoirs—have been met should be establishedbefore they are needed. Such management mea-sures may include increased groundwaterabstractions to supplement low-surface waterflows and storage volumes. Conjunctive use ofground and surface waters can be sustainable aslong as the groundwater aquifers are rechargedduring conditions of high flow and surface stor-age volumes. Many aquifers are subject to with-drawals exceeding recharge, and hence continuedwithdrawals from them cannot be sustained.

1.3.2 Too Much Water

Damage due to flooding is a direct result offloodplain development that is incompatible withfloods. This is a risk many take, and indeed onaverage it may result in positive private netbenefits, especially when public agencies subsi-dize these private risk takers who incur losses intimes of flooding. In many river basins ofdeveloped regions, annual expected flood dam-ages are increasing over time, in spite ofincreased expenditures in flood damage reduc-tion measures. This is in part due to increasedeconomic development taking place on riverflood plains, not only of increased frequenciesand magnitudes of floods.

The increased economic value of developmentson floodplains often justifies increased develop-ment and increased expenditures on flood damagereduction measures. Flood protection worksdecrease the risks of flood damage, creating aneven larger incentive for increased economicdevelopment. Then when a flood exceeding thecapacity of existing flood protectionworks occurs,and itwill, evenmore damage results. This cycle ofincreasingflood damages and costs of protection isa natural result of increasing values of flood plaindevelopment. Just what is the appropriate level ofrisk? It may depend, as Fig. 1.24 illustrates, on thelevel offlood insurance or subsidy provided whenflooding occurs.

Flood damages will decrease only if there arerestrictions placed on floodplain development.

Analyses carried out during planning can helpidentify the appropriate level of development andflood damage protection works based on thebeneficial as well as adverse economic, envi-ronmental, and ecological consequences of floodplain development. People are increasingly rec-ognizing the economic as well as environmentaland ecological benefits of allowing floodplains todo what they were formed to do—store floodwaters when floods occur.

Industrial development and related portdevelopment may result in the demand for deeperand wider rivers to allow the operation of largerdraft cargo vessels in the river. River channelimprovement cannot be detached from functionssuch as water supply and flood control. Wideningand deepening a river channel for shipping pur-poses may also decrease flood water levels.

1.3.3 Too Polluted

Wastewater discharges by industry and house-holds can have considerable detrimental effectson water quality and hence on public andecosystem health. Planning and managementactivities should pay attention to these possiblenegative consequences of industrial developmentand the intensive use and subsequent runoff ofpesticides and fertilizers in urban as well as inagricultural areas.

Issues regarding the environment and waterquality include:

Fig. 1.24 The lowest risk of flooding on a floodplaindoes not always mean the best risk, and what risk isacceptable may depend on the amount of insurance orsubsidy provided when flood damage occurs


• Upstream versus downstream conflicts onmeeting water quality standards,

• Threats from aquatic nuisance species,• Threats from the chemical, physical, and

biological water quality of the watershed’saquatic resources,

• Quality standards for recycled water,• Nonpoint source pollution discharges includ-

ing sediment from erosion, and• Inadequate groundwater protection, compacts,

and concerned institutions.

We still know too little about the environ-mental and health impacts of many of thewastewater constituents found in river waters. Asmore is learned about, for example, the harmfuleffects of heavy metals and dioxins, pharma-ceutical products, and micropollutants andnanoparticles in our water supplies, water qualitystandards, plans and management policies shouldbe adjusted accordingly. The occurrence of majorfish kills and algae blooms also point to the needto manage water quality as well as quantity.

1.3.4 Too Expensive

Too many of the world’s population do not haveadequate water to meet all of their drinking andsanitation needs. Much of this is not due to thelack of technical options available to providewater to meet those needs. Rather those optionsare deemed to be too expensive. Doing so isjudged to be beyond the ability of those living inpoverty to pay and recover the costs of imple-menting, maintaining, and operating the neededinfrastructure. Large national and internationalaid grants devoted to reducing water stress—demands for clean water exceeding usable sup-plies—in stressed communities have not beensustainable in the long run where recipients havebeen unable to pay for the upkeep of whateverwater resource systems are developed and pro-vided. If financial aid is to be provided, to be

effective it has to address all the root causes ofsuch poverty, not only the need for clean water.

1.3.5 Ecosystem Too Degraded

Aquatic and riparian ecosystems may be subjectto a number of threats. The most important onesinclude habitat loss due to river training andreclamation of floodplains and wetlands forurban and industrial development, poor waterquality due to discharges of pesticides, fertilizersand wastewater effluents, and the infestation ofaquatic nuisance species.

Exotic aquatic nuisance species can be majorthreats to the chemical, physical, and biologicalwater quality of a river’s aquatic resources and amajor interference with other uses. The destruc-tion and/or loss of the biological integrity ofaquatic habitats caused by introduced exoticspecies is considered by many ecologists to beamong the most important problems facing nat-ural aquatic and terrestrial ecosystems. Biologi-cal integrity of natural ecosystems is controlledby habitat quality, water flows or discharges,water quality, and biological interactionsincluding those involving exotic species.

Once exotic species are established, they areusually difficult to manage and nearly impossibleto eliminate. This creates a costly burden forcurrent and future generations. The invasion inNorth America of nonindigenous aquatic nui-sance species such as the sea lamprey, zebramussel, purple loosestrife, European green crab,and various aquatic plant species, for example,has had pronounced economic and ecologicalconsequences for all who use or otherwise ben-efit from aquatic ecosystems.

Environmental and ecological effectiveness aswell as economic efficiency should be a guidingprinciple in evaluating alternative solutions toproblems caused by aquatic nuisance organisms.Funds spent in prevention and early detectionand eradication of aquatic nuisance species may


reduce the need to spend considerably morefunds on management and control once suchaquatic nuisance species are well established.

1.3.6 Other Planningand Management Issues

1.3.6.1 NavigationDredging river beds is a common practice tokeep river channels open for larger draft cargoships. The use of jetties as a way to increase theflow in the main channel and hence increasebottom scour is a way to reduce the amount ofdredging that may be needed, but any modifica-tion of the width and depth of a river channel canimpact its flood carrying capacity. It can alsoalter the periodic flooding of the floodplain thatin turn can have ecological impacts.

1.3.6.2 River Bank ErosionBank erosion can be a serious problem wheretowns are located close to morphologically active(eroding) rivers. Predictions of changes in rivercourses due to bank erosion and bank accretionare important inputs to land use planning in rivervalleys and the choice of locations for bridges,buildings, and hydraulic structures.

1.3.6.3 Reservoir Related IssuesDegradation of the riverbeds upstream of reser-voirs may increase the risks of flooding in thoseareas. Reservoir construction inevitably results inloss of land and forces the evacuation of resi-dents due to impoundment. Reservoirs can beecological barriers for migrating fish species suchas salmon. The water quality in the reservoir maydeteriorate and the inflowing sediment may settleand accumulate, reducing the active (useful)water storage capacity of the reservoir andcausing more erosion downstream. Other poten-tial problems may include those stemming fromstratification, water-related diseases, algaegrowth, and abrasion of hydropower turbines.

Environmental and morphological impactsdownstream of the dam are often due to achanged river hydrograph and decreased

sediment load in the water released from thereservoir. Lower sediment concentrations resultin higher risks of scouring of downstream riv-erbeds and consequently a lowering of theirelevations. Economic as well as social impactsinclude the risk of a dam break. Environmentalimpacts may result from sedimentation controlmeasures (e.g., sediment flushing as shown inFig. 1.19) and reduced oxygen content of theoutflowing water.

1.4 System Planning Scales

1.4.1 Spatial Scales for Planningand Management

Watersheds or river basins are usually consideredlogical regions for water resources planning andmanagement. This makes sense if the impacts ofdecisions regarding water resources managementare contained within the watershed or basin. Howland and water are managed in one part of a riverbasin can impact the land and water in other partsof the basin. For example, the discharge of pol-lutants or the clearing of forests in the upstreamportion of the basin may degrade the quality andincrease the variability of the flows and sedi-mentation downstream. The construction of adam or weir in the downstream part of a rivermay block vessels and fish from traveling up- ordownstream through the dam site. To maximizethe economic and social benefits obtained fromthe entire basin, and to insure that these benefitsand accompanying costs are equitably dis-tributed, planning and management on a basinscale is often undertaken.

While basin boundaries make sense from ahydrologic point of view, they may be inade-quate for addressing particular water resourcesproblems that are caused by events taking placeoutside the basin. What is desired is the highestlevel of performance, however defined, of theentire physical, social-economic, and adminis-trative water resource system. To the extent thatthe applicable problems, stakeholders, andadministrative boundaries extend outside the


river basin, then the physically based “riverbasin” focus of planning and management shouldbe expanded to include the entire applicable“problem-shed.” Hence consider the term “riverbasin” used in this book to mean problem-shedwhen appropriate.

1.4.2 Temporal Scales for Planningand Management

Planning is a continuing iterative process. Waterresources plans need to be periodically updatedand adapt to new information, new objectives,and updated forecasts of future demands, costs,and benefits. Current decisions should not pre-clude future generations from options they maywant to consider, but otherwise current decisionsshould be responsive to current needs andopportunities, and have the ability to be adapt-able in the future to possible changes in thoseneeds and opportunities.

The number and duration of within-year timeperiods explicitly considered in the planningprocess will depend in part on the need to con-sider the variability of the supplies of anddemands for water resources and on the purposesto be served by the water resources. Irrigationplanning and summer season water recreationplanning may require a greater number ofwithin-year periods during the summer growingand recreation season than might be the case ifone were considering only municipal watersupply planning, for example. Assessing theimpacts of alternatives for conjunctive surfaceand groundwater management, or for waterquantity and quality management, require atten-tion to processes that typically take place ondifferent spatial and temporal scales.

1.5 Planning and ManagementApproaches

There are two general approaches to planning andmanagement. One is from the top-down, oftencalled command and control. The other is from thebottom-up, often called the grassroots approach.

Both approaches, working together, can lead to anintegrated plan and management policy.

1.5.1 Top-Down Planningand Management

Over much of the past half-century waterresources professionals have been engaged inpreparing integrated, multipurpose “master”development plans for many of the world’s riverbasins. These plans typically consist of a series ofreports, complete with numerous appendices,describing all aspects of water resources man-agement and use. In these documents alternativestructural and nonstructural management optionsare identified and evaluated. Based on theseevaluations, the preferred plan is recommended.

This master planning exercise has typicallybeen a top-down approach. Professionals havedominated the top-down approach. Using thisapproach there is typically little if any activeparticipation of interested stakeholders. Theapproach assumes that one or more institutionshave the ability and authority to develop andimplement the plan, i.e., to oversee and managethe coordinated development and operation ofthe basin’s activities impacting the surface andground waters of the basin. In today’s environ-ment where publics are calling for less govern-ment oversight, regulation and control, andincreasing participation in planning and man-agement activities, strictly top-down approachesare becoming less desirable or acceptable.

1.5.2 Bottom-Up Planningand Management

Within the past several decades water resourcesplanning and management processes haveincreasingly involved the active participation ofinterested stakeholders—those potentially affec-ted by the decision being considered. Plans arebeing created from the bottom-up ratherthan top-down through a process of consensusbuilding. Concerned citizens, nongovernmen-tal organizations, as well as professionals in


governmental agencies are increasingly workingtogether toward the creation of adaptive com-prehensive water management programs, poli-cies, and plans.

Experiences trying to implement plansdeveloped primarily by professionals withoutsignificant citizen involvement have shown thateven if such plans are technically sound theyhave little chance of success if they do not takeinto consideration the concerns and objectives ofaffected stakeholders. To gain their support,concerned stakeholders must be included in thedecision-making process as early as possible.They must become part of the decision-makingprocess, not merely spectators, or even advisors,to it. This will help gain their cooperation andcommitment to the plans eventually adopted.Participating stakeholders will consider theresulting plans as their plans as much as someoneelse’s. They will have a sense of ownership, andas such will strive to make them work. Suchadopted plans, if they are to be successfullyimplemented, must fit within existing legislative,permitting, enforcement, and monitoring pro-grams. Stakeholder participation improves thechance that the system being managed will besustainable.

Successful planning and managementinvolves motivating all potential stakeholdersand sponsors to join and participate in the waterresources planning and management process. Itwill involve building a consensus on goals andobjectives and on how to achieve them. Ideallythis should occur before addressing conflictingissues so that all involved know each other andare able to work together more effectively.Agreements on goals and objectives and on theorganization (or group formed from multipleorganizations) that will lead and coordinate thewater resources planning and management pro-cess should be reached before stakeholders bringtheir individual priorities or problems to the

table. Once the inevitable conflicts becomeidentified, the settling of administrative mattersdoes not get any easier.

Bottom-up planning must strive to achieve acommon or “shared” vision among all stake-holders. It must either comply with all applicablelaws and regulations, or propose changes tothem. It should strive to identify and evaluatemultiple alternatives and performance criteria—including sustainability criteria, and yet keep theprocess from producing a wish list of everythingeach stakeholder wants. In other words, it mustidentify trade-offs among conflicting goals ormeasures of performance, and prioritizingappropriate strategies. It must value and com-pare, somehow, the intangible and nonmonetaryimpacts of environmental and ecosystem pro-tection and restoration with other activitieswhose benefits and costs can be expressed inmonetary units. In doing all this, planners shoulduse modern information technology, as available,to improve both the process and product. Thistechnology, however, will not eliminate the needto reach conclusions and make decisions on thebasis of incomplete and uncertain data and sci-entific knowledge.

These process issues emphasize the need tomake water resources planning and managementas efficient and effective as possible and remainparticipatory. Many issues will arise in terms ofevaluating alternatives and establishing perfor-mance criteria (prioritizing issues and possibleactions), performing incremental cost analysis,and valuing monetary and nonmonetary benefits.Questions must be answered as to how muchdata must be collected and with what precision,and what types of modern information technol-ogy (e.g., geographic information systems (GIS),remote sensing, Internet and mobile Internetnetworks, decision support systems, etc.) can bebeneficially used both for analyses as well ascommunication.

1.5 Planning and Management Approaches 35

1.5.3 Integrated Water ResourcesManagement

The concept of integrated water resources man-agement (IWRM) has been developing over thepast several decades. IWRM is the response tothe growing pressure on our water resourcessystems caused by growing populations andsocioeconomic developments. Water shortagesand deteriorating water quality have forced manycountries in the world to reconsider their devel-opment policies with respect to the managementof their water resources. As a result waterresources management (WRM) has been under-going a change worldwide, moving from amainly supply-oriented, engineering-biasedapproach toward a demand-oriented, multisec-toral approach, often labeled integrated waterresources management.

The concept of IWRM moves away fromtop-down “water master planning” that usuallyfocuses onwater availability and development, andtoward “comprehensive water policy planning”that addresses the interaction between differentsubsectors (Fig. 1.25), seeks to establish priorities,considers institutional requirements, and deals withthe building of management capacity.

Box 1.1 Definition of IWRMIWRM is a process which promotes thecoordinated development and managementof water, land, and related resources, inorder to maximize the resultant economicand social welfare in an equitable mannerwithout compromising the sustainability ofvital ecosystems.(GWP 2000)

IWRM (Box 1.1) considers the use of theresources in relation to social and economicactivities and functions. These determine theneed for laws and regulations pertaining to thesustainable and beneficial use of the waterresources. Infrastructure together with regulatorymeasures allows more effective use of theresource including meeting ecosystem needs.

1.5.4 Water Securityand the SustainableDevelopment Goals(SDGs)

While IWRM focuses on the process to improvewater management (the how), the term “watersecurity” focuses on the output (the what). TheWorld Economic Forum has identified WaterSecurity as one of the biggest global economicdevelopment issues. Water Security is defined byUN-Water (2013) as

the capacity of a population to safeguard sustain-able access to adequate quantities of acceptablequality water for sustaining livelihoods, humanwell-being, and socio-economic development, forensuring protection against water-borne pollutionand water-related disasters, and for preservingecosystems in a climate of peace and politicalstability.

Attempts are being made to identify the manydimensions of water security and to quantifythem (van Beek and Arriens 2014; ADB 2016).In 2015 the UN adopted the Sustainable Devel-opment Goals 2015–2030 that specify specific

Fig. 1.25 Interactions among the natural, administrative,and socioeconomic water resource subsectors andbetween them and their environment


targets for various goals such as the provision ofwater for drinking and sanitation, water produc-tivity in agriculture, industry and energy, envi-ronment, and reduction of floods and droughts. Itis expected that many countries will expect theirwater managers to use the SDGs as objectives inwater resources planning. This means that ourplanning and management proposals need to beable to quantify the impacts of possible plans andpolicies in terms of the SDG targets.

1.5.5 Planning and ManagementAspects

1.5.5.1 TechnicalTechnical aspects of planning include hydrologicassessments. Hydrologic assessments identifyand characterize the properties of, and interac-tions among, the resources in the basin or region.This includes the land, the rainfall, the runoff, thestream and river flows, and the groundwater.

Existing watershed land use and land cover,and future changes in this use and cover, result inpart from existing and future changes in regionalpopulation and economy. Planning involvespredicting changes in land use/covers and eco-nomic activities at watershed and river basinlevels. These will influence the amount of runoff,and the concentrations of sediment and otherquality constituents (organic wastes, nutrients,pesticides, etc.) in the runoff resulting from anygiven pattern of rainfall over the land area. Thesepredictions will help planners estimate thequantities and qualities of flows throughout awatershed or basin, associated with any land useand water management policy. This in turn pro-vides the basis for predicting the type and healthof terrestrial and aquatic ecosystems in the basin.All of this may impact the economic develop-ment of the region, which is what, in part,determines the future demands for changes inland use and land cover.

Technical aspects also include the estimationof the costs and benefits of any measures taken tomanage the basin’s water resources. These mea-sures might include:

• Engineering structures for making better useof scarce water.

• Canals and water-lifting devices.• Dams and storage reservoirs that can retain

excess water from periods of high flow foruse during the periods of low flow. By stor-age of floodwater they may also reduce flooddamage below the reservoir.

• Open channels that may take the form of acanal, flume, tunnel, or partly filled pipe.

• Pressure conduits.• Diversion structures, ditches, pipes, checks,

flow dividers, and other engineering facilitiesnecessary for the effective operation of irri-gation and drainage systems.

• Municipal and industrial water intakes,including water purification plants and trans-mission facilities.

• Sewerage and industrial wastewater treatmentplants, including waste collection and ulti-mate disposal facilities.

• Hydroelectric power storage, run-of-river, orpumped storage plants.

• River channel regulation works, bank stabi-lization, navigation dams and barrages, navi-gation locks, and other engineering facilitiesfor improving a river for navigation.

• Levees and floodwalls for confining flowswithin predetermined channels.

Not only must the planning process identifyand evaluate alternative management strategiesinvolving structural and nonstructural measuresthat will incur costs and bring benefits, but itmust also identify and evaluate alternative timeschedules for implementing those measures. Theplanning of development over time involvinginterdependent projects, uncertain future suppliesand demands as well as costs, benefits, and in-terest (discount) rates is part of all waterresources planning and management processes.

With increasing emphasis placed on ecosystempreservation and enhancement, planning mustinclude ecologic impact assessments. The mix ofsoil types and depths and land covers together withthe hydrological quantity and quality flow andstorage regimes in rivers, lakes, wetlands, and


aquifers all impact the riparian and aquatic ecol-ogy of the basin. Water managers are being askedto consider ways of improving or restoringecosystems by, for example, reducing the

• destruction and/or loss of the biologicalintegrity of aquatic habitats caused by intro-duced exotic species or changes in flow andsediment patterns due to upstream reservoiroperation.

• decline in number and extent of wetlands andthe adverse impacts to wetlands of proposedland and water development projects.

• conflicts between the needs of people forwater supply, recreational, energy, floodcontrol, and navigation infrastructure and theneeds of ecological communities, includingendangered species.

And indeed there are and will continue to beconflicts among alternative objectives and pur-poses of water management. Planners and man-agers must identify the trade-offs amongenvironmental, ecologic, economic, and socialimpacts, however measured, and the managementalternatives that balance these often-conflictinginterests.

1.5.5.2 Financial and EconomicThe overriding financial component of any plan-ning process is to make sure that the recom-mended plans and projects will be able to pay forthemselves. Revenues are needed to recoverconstruction costs, if any, and to maintain, repair,and operate any infrastructure designed to man-age the basin’s water resources. This may requirecost-recovery policies that involve pricing theoutputs of projects. Recognizing water as aneconomic good does not always mean that fullcosts should be charged. Poor people have theright to safe water and how this is to be achievedshould be taken into account. Yet beneficiariesshould be expected to pay at least something forthe added benefits they get. Planning must iden-tify equitable cost and risk-sharing policies andimproved approaches to risk/cost management.

Financial viability is often viewed as a con-straint that must be satisfied. It is not viewed asan objective whose maximization could result ina reduction in economic efficiency, equity, orother nonmonetary objectives. In many devel-oping countries a distinction is made between therecovery of investment costs and the recovery ofO&M costs. Recovery of O&M costs is a mini-mum condition for a sustainable project. Withoutthat, it is likely that the performance of the pro-ject will deteriorate over time.

Many past failures in water resources man-agement are attributable to the fact that water—itsquantity, reliability, quality, pressure, location—has been and still is viewed as a free good. Pricespaid for irrigation and drinking water are in manycountries well below the full cost of the infras-tructure and personnel needed to provide thatwater, which comprises the capital chargesinvolved, the operation and maintenance (O&M)costs, the opportunity cost, economic and envi-ronmental externalities (see GWP 2000). Charg-ing for water at less than full cost means that thegovernment, society, and/or environment “subsi-dizes” water use and leads to an inefficient use ofthe resource.

1.5.5.3 Institutional and GovernanceThe first condition for the successful implemen-tation of plans and policies is to have an enablingenvironment. There must exist national, provin-cial, and local policies, legislation and institu-tions that make it possible for the desireddecisions to be taken and implemented. The roleof the government is crucial. The reasons forgovernmental involvement are manifold:

• Water is a resource beyond property rights: itcannot be “owned” by private persons. Waterrights can be given to persons or companies,but only the rights to use the water and not toown it. Conflicts between users automaticallyturn up at the table of the final owner of theresource—the government.

• Water is a resource that often requires largeinvestments to develop, treat, store, distribute,


and use, and then to collect, treat, and disposeor reuse. Examples are multipurpose reser-voirs and the construction of dykes alongcoasts and rivers. The required investmentsare large and typically can only be made bygovernments or state-owned companies.

• Water is a medium that can easily transferexternal effects. The use of water by oneactivity often has negative effects on otherwater using activities (externalities). Theobvious example is the discharge of wastew-ater into a river may save the dischargermoney but it may have negative effects ondownstream users requiring cleaner water.

Only the government can address many ofthese issues and hence “good governance” isnecessary for good water management. Aninsufficient institutional setting and the lack of asound economic base are the main causes ofwater resources development project failure, nottechnical inadequacy of design and construction.This is also the reason why at present muchattention is given to institutional developmentsand governance in both developed and develop-ing regions and countries.

In Europe, various types of water agencies areoperational (e.g., the Agence de l’Eau in Franceand the water companies in England), eachhaving advantages and disadvantages. The WaterFramework Directive of the European Unionrequires that water management be carried out atthe scale of a river basin, particularly when thisinvolves transboundary management. It is verylikely that this will result in a shift in responsi-bilities of the institutions involved and theestablishment of new institutions. In other partsof the world experiments are being carried outwith various types of river basin organizations,combining local, regional, and sometimesnational governments.

1.5.5.4 Models for Impact Predictionand Evaluation

Planning processes have undergone a significanttransformation over the past five decades, mainlydue to the continuing development of improvedcomputational technology. Planning today is

heavily dependent on the use of computer-basedimpact prediction models. Such models are usedto assist in the identification and evaluation ofalternative ways of meeting various planning andmanagement objectives. They provide an effi-cient way of using spatial and temporal data in aneffort to predict the interaction and impacts, overspace and time, of various river basin compo-nents under alternative designs and operatingpolicies.

Many of the systems analysis approaches andmodels discussed in the following chapters ofthis book have been, and continue to be, centralto the planning and management process. Theirusefulness is directly dependent on the quality ofthe data and models being used. Models canassist planning and management at differentlevels of detail. Some models are used for pre-liminary screening of alternative plans and poli-cies, and as such do not require major datacollection efforts. Screening models can also beused to estimate how significant certain data andassumptions are to the decisions being consid-ered, and hence can help guide additional datacollection activities. At the other end of theplanning and management spectrum, much moredetailed models can be used for engineering de-sign. These more complex models are more datademanding, and typically require higher levels ofexpertise for their proper use.

The integration of modeling technology intothe social and political components of the plan-ning and management processes in a way thatenhances those processes continues to be themain challenge of those who develop planningand management models. Efforts to build andapply interactive generic modeling programs or“shells” into which interested stakeholders can“draw in” their system, enter their data and op-erating rules at the level of detail desired, simu-late it, and discover the effect of alternativeassumptions and operating rules, has in manycases helped to create a common or sharedunderstanding among these stakeholders. Gettingstakeholders involved in developing and experi-menting with their own interactive data-drivenmodels has been an effective way of building aconsensus—a shared vision.


1.5.5.5 Models for Shared Visionor Consensus Building

Participatory planning involves conflict man-agement. Each stakeholder or interest group hasits objectives, interests, and agendas. Some ofthese may be in conflict. The planning andmanagement process is one of negotiation andcompromise. This takes time but from it cancome decisions that have the best chance ofbeing considered the right decisions by mostparticipants. Models can assist in this process ofreaching a common understanding and agree-ment among different stakeholders. This has agreater chance of happening if the stakeholdersthemselves are involved in the modeling process.

Involving stakeholders in collaborative modelbuilding accomplishes a number of things. Itgives them a feeling of ownership. They willhave a much better understanding of just whattheir model can do and what it cannot do. If theyare involved in model building, they will knowthe assumptions built into their model.

Being involved in a modeling exercise is away to understand better the impacts of variousassumptions one must make when developingand running models. While there may be noagreement on the best of various assumptions tomake, stakeholders can learn which of thoseassumptions matter and which do not. In addi-tion, the involvement of stakeholders in theprocess of model development will create dis-cussions that will lead toward a better under-standing of everyone’s interests and concerns.Though such model building exercises, it is justpossible those involved will reach not only abetter understanding of everyone’s concerns, butalso a common or “shared” vision of at least howtheir system (as represented by their model, ofcourse) works.

1.5.5.6 Models for AdaptiveManagement

Recent emphasis has shifted from structuralengineering solutions to more nonstructural al-ternatives, especially for environmental andecosystem restoration. Part of this shift reflectsthe desire to keep more options open for futuregenerations. It reflects the desire to be adaptive to

new information and to respond to surprises—impacts not forecasted. As we learn more abouthow river basins, estuaries, and coastal zoneswork, and how humans can better manage thoseresources, we do not want to regret what we havedone in the past that may preclude thisadaptation.

In some situations, it may be desirable tocreate a “rolling” plan—one based on the resultsof an optimization or simulation model of aparticular water resource system that can beupdated at any time. This permits responses toresource management and regulatory questionswhen they are asked, not just at times when newplanning and management exercises take place.While this appears to be desirable, will planningand management organizations have the financ-ing and support to maintain and update themodeling software used to estimate variousimpacts, collect and analyze new data, andmaintain the expertise, all of which are necessaryfor continuous planning (rolling plans)?

1.6 Planning and ManagementCharacteristics

1.6.1 Integrated Policiesand Development Plans

Clearly, a portion of any water resources plan-ning and management study report should con-tain a discussion of the particular site-specificwater resource management issues and options.Another part of the report might include a pri-oritized list of strategies for addressing existingproblems and available development or man-agement opportunities in the basin.

Recent emphasis has shifted from structuralengineering solutions to more nonstructural al-ternatives, especially for environmental andecosystem restoration. Part of this shift reflectsthe desire to keep more options open for futuregenerations. It reflects the desire to be adaptive tonew information and to respond to surprises—impacts not forecasted. As we learn more abouthow river basins, estuaries, and coastal zoneswork, and how humans can better manage their


water resources, we do not want to be regrettingwhat we have done in the past that may precludethis adaptation.

Consideration also needs to be given toimproving the quality of the water resourcesplanning and management review process andfocusing on outcomes themselves rather thanoutput measures. One of the outcomes should bean increased understanding of some of the rela-tionships between various human activities andthe hydrology and ecology of the basin, estuary,or coastal zone. Models developed for predictingthe economic as well as ecologic interactions andimpacts due to changes in land and water man-agement and use could be used to addressquestions such as:

• What are the hydrologic, ecologic, and eco-nomic consequences of clustering or dis-persing human land uses such as urban andcommercial developments and large residen-tial areas? Similarly, what are the conse-quences of concentrated versus dispersedpatterns of reserve lands, stream buffers, andforestland?

• What are the costs and ecological benefits of aconservation strategy based on near-streammeasures (e.g., riparian buffers) versusnear-source (e.g., upland/site edge) measures?What is the relative cost of forgone uplanddevelopment versus forgone valley or ripariandevelopment? Do costs strongly limit the useof stream buffer zones as mitigating foragriculture, residential, and urbandevelopments?

• Should large intensive developments be bestlocated in upland or valley areas? Does theanswer differ depending on economic, envi-ronmental, or aquatic ecosystem perspec-tives? From the same perspectives, is themost efficient and desirable landscape highlyfragmented or highly zoned with centers ofeconomic activity?

• To what extent can riparian conservation andenhancement mitigate upland human land useeffects? How do the costs of upland controls

compare with the costs of riparian mitigationmeasures?

• What are the economic and environmentalquality trade-offs associated with differentareas of different classes of land use such ascommercial/urban, residential, agriculture,and forest?

• Can adverse effects on hydrology, aquaticecology, and water quality of urban areas bebetter mitigated with upstream or downstreammanagement approaches? Can land controlslike stream buffers be used at reasonable costwithin urban areas, and if so, how effectiveare they?

• Is there a threshold size for residential/commercial areas that yield marked ecologi-cal effects?

• What are the ecological states at the land-scape scale that once attained become irre-versible with reasonable mitigation measures?For example, once stream segments in anurban setting become highly altered by directand indirect effects (e.g., channel bank pro-tection and straightening and urban runoff),can they be restored with feasible changes inurban land use or mitigation measures?

• Mitigating flood risk by minimizing flood-plain developments coincides with conserva-tion of aquatic life in streams. What arethe economic costs of this type of riskavoidance?

• What are the economic limitations and eco-logic benefits of having light residential zonesbetween waterways and commercial, urban,or agriculture lands?

• What are the economic development deci-sions that are irreversible on the landscape?For example, once land is used for commer-cial development, it is normally too costly toreturn it to agricultural land. This wouldidentify limits on planning and managementfor conservation and development.

• What are the associated ecological and eco-nomic impacts of the trend in residential,commercial and forests lands replacing agri-cultural lands?

1.6 Planning and Management Characteristics 41

The answers to these and similar questionsmay well differ in different regions. However, ifwe can address them on a regional scale, i.e., inmultiple river basins, we just might begin tounderstand and predict better the interactionsamong economy, environment ecology, andpeople as a function of how we manage and useits land and water. This in turn may help us bettermanage and use our land and water resources forthe betterment of all—now and on into the future.

1.6.2 Sustainability

Sustainable water resource systems are thosedesigned and managed to best serve people livingin the future as well as those of us living today.The actions that we as a society take now tosatisfy our own needs and desires should notonly depend on what those actions will do for usbut also on how they will affect our descendants.This consideration of the long-term impacts onfuture generations of actions taken now is theessence of sustainable development. While theword “sustainability” can mean different thingsto different people, it always includes a consid-eration of the welfare of those living in thefuture. While the debate over a more precisedefinition of sustainability will continue, andquestions over just what it is that should besustained may remain unanswered, this shouldnot delay progress toward achieving waterresource systems that we judge best serves thoseof us living today as well as our children andtheir children living in the future.

The concept of environmental and ecologicalsustainability has largely resulted from a growingconcern about the long-run health of our planet.There is increasing evidence that our presentresource use and management activities andactions, even at local levels, can significantlyaffect the welfare of those living within muchlarger regions in the future. Water resourcemanagement problems at a river basin level arerarely purely technical and of interest only tothose living within the individual river basinswhere those problems exist. They are

increasingly related to broader societal structures,demands, and goals.

What would future generations like us to dofor them? We do not know, but we can guess. Asuncertain as these guesses will be, we shouldtake them into account as we act to satisfy ourown immediate needs, demands, and desires.There may be trade-offs between what we wishto do for ourselves in our current generationversus what we think future generations mightwish us to do for them. These trade-offs, if any,between what present and future generationswould like should be considered. Once identified,or at least estimated, just what decisions to makeshould be debated and decided in the politicalarena. There is no scientific theory to help usidentify which trade-offs, if any, are optimal.

The inclusion of sustainability criteria alongwith the more common economic, environmen-tal, ecological, and social criteria used to evaluatealternative water resources development andmanagement strategies may identify a need tochange how we commonly develop and use ourwater resources. We need to consider the impactsof change itself. Change over time is certain; justwhat it will be is uncertain. These changes willimpact the physical, biological, and socialdimensions of water resource systems. Anessential aspect in the planning, design andmanagement of sustainable systems is the antic-ipation of change. This includes change due togeomorphologic processes, to aging of infras-tructure, to shifts in demands or desires of achanging society, and even due to increasedvariability of water supplies, possibly because ofa changing climate. Change is an essential fea-ture of sustainable water resources developmentand management.

Sustainable water resource systems are thosedesigned and operated in ways that make themmore adaptive, robust, and resilient to an uncer-tain and changing future. Sustainable waterresource systems must be capable of effectivelyfunctioning under conditions of changing sup-plies, management objectives, and demands.Sustainable systems, like any others, may fail,but when they fail they must be capable of


recovering and operating properly without unduecosts.

In the face of certain changes, but withuncertain impacts, an evolving and adaptivestrategy for water resources development, man-agement, and use is a necessary condition ofsustainable development. Conversely, inflexibil-ity in the face of new information and new ob-jectives and new social and politicalenvironments is an indication of reduced systemsustainability. Adaptive management is a processof adjusting management actions and directions,as appropriate, in light of new information on thecurrent and likely future condition of our totalenvironment and on our progress toward meetingour goals and objectives. Water resourcesdevelopment and management decisions can beviewed as experiments, subject to modification—but with goals clearly in mind. Adaptive man-agement recognizes the limitations of currentknowledge and experience and that we learn byexperimenting. It helps us move toward meetingour changing goals over time in the face of thisincomplete knowledge and uncertainty. It acceptsthe fact that there is a continual need to reviewand revise management approaches because ofthe changing as well as uncertain nature of oursocioeconomic and natural environments.

Changing the social and institutional compo-nents of water resource systems are often themost challenging because they involve changingthe way individuals think and act. Any processinvolving change will require that we change ourinstitutions—the rules under which we as asociety function. Individuals are primarilyresponsible for, and adaptive to, changing polit-ical and social situations. Sustainability requiresthat public and private institutions also changeover time in ways that are responsive to the needsof individuals and society.

Given the uncertainty of what future genera-tions will want, and the economic, environmental,and ecological problems they will face, a guidingprinciple for the achievement of sustainable waterresource systems is to provide options that allowfuture generations to alter such systems. One ofthe best ways to do this is to interfere as little aspossible with the proper functioning of natural

life cycles within river basins, estuaries, andcoastal zones. Throughout the water resourcesystem planning and management process, it isimportant to identify all the beneficial and adverseecological, economic, environmental, and socialeffects—especially the long-term effects—asso-ciated with any proposed planning and manage-ment project.

1.7 Meeting the Planningand ManagementChallenges—A Summary

Planning (the formulation of development andmanagement plans and policies) is an importantand often indispensable means to support andimprove operational management. Planning pro-vides an opportunity to:

• assess the current state of the water resourcesand the conflicts and priorities over their use,formulate visions, set goals and targets, andthus orient operational management,

• provide a framework for organizing policyrelevant research and public participation,

• increase the legitimacy, public acceptance of,or even support for how the resources are tobe allocated or controlled, especially in timesof stress, and

• facilitate the interaction, discussion, andcoordination among managers and stake-holders, and generate a common point ofreference—a management plan or policy.

Many of the concerns and issues beingaddressed by water resources planners andmanagers today are similar to those faced byplanners and managers in the past. But some aredifferent. Most of the new ones are the result oftwo trends: (1) a growing concern for the sus-tainability of natural ecosystems and (2) anincreased recognition for the need of thebottom-up “grassroots” participatory approach toplanning, managing, and decision-making.

Today planners work for economic develop-ment and prosperity as they did in the past,keeping in mind environmental impacts and

1.6 Planning and Management Characteristics 43

goals as they have done in the past, but nowrecognizing ecological impacts and values aswell. Water resources management may still befocused on controlling and mitigating the adverseimpacts of floods and droughts and water pollu-tion, on producing hydropower, on developingirrigation, on controlling erosion and sediment,and on promoting navigation, but only as theseand similar activities are compatible with healthyecosystems. Natural ecosystems generally benefitfrom the variability of natural hydrologicregimes. Other users prefer less variability. Muchof our engineering infrastructure is operated so asto reduce hydrologic variability. Today waterresource systems are increasing, required toprovide rather than reduce hydrologic (andaccompanying sediment load) variability.Reservoir operators, for example, can modifytheir water release policies to increase this vari-ability. Farmers and land use developers mustminimize rather than encourage land-disturbingactivities. Floodplains may need to get wetoccasionally. Rivers and streams may need tomeander and fish species requiring habitats alongthe full length of rivers to complete their lifecycles must have access to those habitats. Clearlythese ecological objectives, added to all the othereconomic and environmental ones, can onlycompound the conflicts and issues with respect toland and water management and use.

So, how can we manage all this conflict anduncertainty? We know that water resourcesplanning and management should be founded onsound science, efficient public program adminis-tration, and broad participation of stakeholders.Yet obtaining each of these three conditions is adifficult challenge. While the natural and socialsciences can help us predict the economic, envi-ronmental, and ecological impacts of alternativedecisions, those predictions are never certain. Inaddition, these sciences offer no help in deter-mining the best decision to make in the face ofmultiple conflicting goals held by multiplestakeholders—goals that have changed, and nodoubt will continue to change. Water resourcesplanning and management and decision-makingare not as easy as “we professionals can tell youwhat to do. All you need is the will to do it.” Very

often it is not clear what should be done. Pro-fessionals administering the science, often frompublic agencies, nongovernmental organizations,or even from universities, are merely among allthe stakeholders having an interest in and con-tributing to the management of water.

Each governmental agency, consulting firm,environmental interest group, and citizen typi-cally has its own limitations, authorities, exper-tise and conflicts with other people, agencies andorganizations, all tending to detract fromachieving a fully integrated approach to waterresources planning and management. But justbecause of this, the participation and contribu-tions of all these stakeholders are needed. Theymust come together in a partnership if indeed anintegrated approach to water resources planningand management is to be achieved and sustained.All views must be heard, considered, and actedupon by all involved in the water resourcesplanning and management process.

Water resources planning and management isnot simply the application and implementation ofscience. It is creating a social environment thatgets all of us who should be involved, from thebeginning, in a continuing planning process. Thisprocess is one of

• educating ourselves about how our systemswork and function,

• identifying existing or potential options andopportunities for enhancement and resourcedevelopment and use,

• resolving the inevitable problems and con-flicts that will result over who gets what andwhen and who pays who for what and when,

• making and implementing decisions, andfinally of

• monitoring the impacts of those decisions.

This process is repeated as surprises or newopportunities or new knowledge dictates.

Successful water resources planning andmanagement requires the active participation ofall community institutions involved in economicdevelopment and resource management. Howcan this begin at the local stakeholder level? Howdoes anyone get others interested in preventing


problems before those problems are apparent, orespecially before “unacceptable” solutions areoffered to deal with them? And how do you dealwith the inevitable group or groups of stake-holders who see it in their best interest not toparticipate in the planning process, but to justcriticize it from the outside? Who is in a positionat the local level to provide that leadership andneeded financial support? In some regions, non-governmental institutions have been instrumentalin initiating and coordinating this process at localgrassroot levels.

Water resources planning and managementprocesses should identify a vision that guidesdevelopment and operational activities in theaffected region. Planning and management pro-cesses should

• recognize and address the goals and expec-tations of the region’s stakeholders,

• identify and respond to the region’swater-related problems,

• function effectively within the region’slegal/institutional frameworks,

• accommodate both short- and long-term issues,• generate a diverse menu of alternatives,• integrate the biotic and abiotic parts of the

basin,• take into account the allocation of water for

all needs, including those of natural systems,• be stakeholder-driven,• take a global perspective,• be flexible and adaptable,• drive regulatory processes, not be driven by them,• be the basis for policy making,• foster coordination among planning partners

and consistency among related plans,• be accommodating of multiple objectives,• be a synthesizer, recognize and deal with

conflicts, and• produce recommendations that can be

implemented.

All too often integrated planning processes arehampered by the separation of planning, manage-ment and implementing authorities, turf-protectionattitudes, shortsighted focusing of efforts, lack of

objectivity on the part of planners, and inadequatefunding. These deficiencies need addressing ifintegrated holistic planning and management is tobe more than just something to write about.

Effective water resources planning and man-agement is a challenge today, and will be anincreasing challenge into the foreseeable future.This book introduces some of the tools that arebeing used to meet these challenges. We considerit only a first step toward becoming an accom-plished planner or manager.

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Exercises

1:1 How would you define “Integrated WaterResources Management” and what distin-guishes it from “Sustainable WaterResources Management”?

1:2 Can you identify some common watermanagement issues that are found in manyparts of the world?

1:3 Comment on the common practice of gov-ernments giving aid to those in drought orflood areas without any incentives to alterland use management practices in anticipa-tion of the next drought or flood.

1:4 What tools and information are available fordeveloping integrated water resources plansand management policies?

1:5 What structural and nonstructural measurescan be taken to address water resourcesissues?

1:6 Find the following statistics:• Percent of all freshwater resources

worldwide available for drinking;


• Number of people who die each yearfrom diseases associated with unsafedrinking water;

• Percent of total freshwater resources inpolar regions;

• Per capita annual withdrawal of cubicmeters of freshwater in various countries;

• Average world per capita annual with-drawal of cubic meters of freshwater;

• Tons of pollutants entering lakes andrivers daily in various regions;

• Average number of gallons of waterconsumed by humans in a lifetime;

• Average number of kilometers per day awoman in a developing country mustwalk to fetch fresh water.

1:7 Identify and briefly describe the six greatestrivers in the world.

1:8. Identify some of the major water resourcemanagement issues in the region where youlive. What management alternatives mighteffectively reduce some of the problems or

provide additional economic, environmen-tal, or social benefits.

1:9. Describe some water resource systems con-sisting of various interdependent natural,physical, and social components. What arethe inputs to the systems and what are theiroutputs? How did you decide what to includein the system and what not to include?

1:10. Sustainability is a concept applied torenewable resource management. In yourwords define what that means and how itcan be used in a changing and uncertainenvironment both with respect to watersupplies and demands. Over what space andtimescales is it applicable, and how can onedecide whether or not some plan or man-agement policy will be sustainable? Howdoes this concept relate to the adaptivemanagement concept?

1:11. Identify and discuss briefly some of themajor issues and challenges facing watermanagers today.

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