Washington Department of Forestry, Stream Habitat Restoration Guidelines, 2004 Ryan Johnson.
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Transcript of Washington Department of Forestry, Stream Habitat Restoration Guidelines, 2004 Ryan Johnson.
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Fish Passage and Sediment Control
Washington Department of Forestry, Stream Habitat Restoration Guidelines, 2004
Ryan Johnson
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OverviewFish passage restoration
Spawning gravel cleaning and placement
Instream Sediment Detention Basins
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Washington Fish SpeciesAnadromous
o Steelheado Coho, Chinook, Pink, Chum, and Sockeye Salmono Cutthroat Trouto Pacific and River Lampreyo Green and White Sturgeono American Shado Dolly Varden/Bull Trouto Longfin Smelto Eulachon
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Washington Fish SpeciesFreshwater
o Juveille Coho, Chinook, and Steelheado Kokaneeo Rainbow and Cutthroat Trouto Brown and Brook Trouto Bull Trout/Dolly Vardeno Olympic Mudminnowo Sticklebacko Sculpino Pygmy and Mountain Whitefisho Cyprinidso Catostomidso Sturgeono Western Brook Lamprey
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Fish PassageAll listed fish require unimpeded access
up and downstreamoSafe, effective passage between reproduction, feeding, and refuge habitats
Passage timing, frequency, and duration varies with each species
Passage not limited to mainstreamoLateral movement
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Blockage of Passage2,256 road crossings of fish bearing
streamso1,036 identified as barriersoPotential for >33,000 salmonid blockages
Coincides with blockage of downstream transport of habitat elementsoSediment, water, wood
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Fish Passage RestorationPotential for greatest return on valueoAs simple as retrofitting a culvert
Can restore fish population, and habitats downstream
Best used in vertically and laterally stable streamsoPassage structures can become buried
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Risk & UncertaintyRisk to resident fish
o Can create competition with established species
o Can introduce species historically not ever present
Structures can fill with sedimento If not maintained, possible catastrophic failure
of road fill
With relevant data and proper analysis, uncertainty is minimal
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Spawning Gravel Cleaning and Placement
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Salmonid Spawning HabitatControlling factorsoSize, permeability, and compaction of substrate
oVelocity, depth, direction, and dissolved oxygen content of flow
oProximity to cover and rearing habitat
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Excessive Fine SedimentBuries spawning gravelReduces availability of dissolved oxygen
to eggsReduces removal rate of metabolic wastes
from the reddDisplaces aquatic invertebrates from
gravel pore spacesoPrimary source of food for juvenile
salmonids
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Gravel CleaningMechanized removal of fine materialoOccasionally hydraulic removal
Temporary if source of fines not tended to
Should only be used where excessive fines are the limiting factor for salmonids
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Gravel PlacementSpawning gravel added to replace identified loss
of gravelConstruction of discrete spawning pads
o Typically created by channel constriction or streambed control structures
Must be careful with placemento High flows can wash away eggs
Appropriate if stream’s capacity to retain gravel is restored
May be used in fines-dominated stream if there is no continuing source of fines
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Sediment SizeOptimal sediment size for most salmonid specieso80% of 10-50 mm gravelo20% up to 100 mm graveloTrace coarse sand (2-5 mm)
No angular or crushed gravel
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Risk & UncertaintyRelatively low risk for both methods
oTemporary destabilization of habitatoTargeting benefits toward one species
may hurt other speciesoPlacing gravel may cause aggradation in
unwanted placesSignificant uncertainty
oStream-specific and species-specificoObservation and evaluation important
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Data and AssessmentMust understand requirements of involved species
and habitatGravel cleaning questions (lots of fines):
o Single event or chronic source of sediment?o Fines increased by land use?
o If yes, watershed and riparian restoration viable?
Gravel placement questions (no gravel):o Gravel recruitment problem?o Limits by transport conditions?o Anthropogenic or natural?
o If natural, should the habitat be altered?o If human, can the source be addressed?
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VariationVariation in redd creation from different
specieso Substrate size, water depth, and water velocity
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CostCan be costly and vary from project to
project, depending on specific needs
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MaintenanceGravel cleaning should require no maintenance
Gravel placement should be monitored regularlyoGravel moves slowly downstreamoPeriodic replenishment
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Instream Sediment Detention Basins
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Gravel TrapsPools built to capture and store sediment
for removalUseful for curbing excessive aggradation
in a pinchoTreats only the symptom, not the source
Should only be used after developing a full understanding of sediment source(s) and patterns of depositionoMust allow appropriate types of
sediment to continue
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ConsiderationsBuilding structures of this nature
disrupt the habitat on a local scaleCauses discontinuity in sediment
and debris flowsCan interfere with organism survival
requirements
All-in-all, very invasive
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GoalShort-term solution for removal of excess sediment
Used before long-term measures can be implemented or before they become effective
Most effective for gravels, cobbles, and boulders
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Risks & UncertaintyImpedance of fish passage up and downstreamMay strand fish during low or no-flow periodsCleanout requires fish relocation
o High stress, injury, or deathIf unmonitored, lateral channel migration can
occurCan increase flood levels
High natural variability causes high uncertainty in efficacy of trap and size of particle trapped
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PlanningMake sure there is no alternativeIs mitigation necessary? Is the obligation
worth it?Starvation of downstream spawning
habitats of gravel?Downstream incision or scour?How often will inspection, maintenance,
and cleanout be necessary?Where will the sediment be dumped?How will the trap be decommissioned?
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LocationShould be placed at a natural grade break or constrictionoLow velocityoIncrease natural tendency for sediment to accumulate
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ConstructionTwo major componentsoExcavation of the basinoConstruction of the flow control structures
Off-site assembly reduces time stream is impacted
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Flow Control StructuresWeirs
oControlled by shape, elevation, and length of weir crest
oFlow passes over weir crestSlots
oConfigured in vertical orientationoFlow passes through slot
Flashboard risers and gatesoAllows isolation of active working area
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Slot & Weir
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Sediment RemovalBasin design should include bypass ditch or pipeoDiverts stream flow while removal occurs
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Cost and MaintenanceIncludes excavation and hauling, and
construction of structures, includingoFlow control devices and bypass
channelsMaintenance costs for sediment removal
Frequent monitoring importantoSediment removal can be initiated near
operating capacityoShould be checked after each flood
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DecommissioningShort-term projectShould be as simple as removing the flow control devices
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SummaryFish passage restoration
o Simple and cost-effectiveo Must consider needs of different species
Gravel cleaningo Removal of fines, which can negatively impact
salmon spawningGravel placement
o Creation of spawning pads where gravel deposition is minimal
Gravel trapso Short-term solution to excessive sediment
transportation