The Isar -Plan Project in Munich Great (Un) expectations. · · 2013-09-16The Isar -Plan Project...
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State Office for Water Management Munich The Isar -Plan Project in Munich Great (Un) expectations. European River Restoration Conference Session 5- Enhancement of Multi-Use Landscapes 11-13 September 2013
Transcript of The Isar -Plan Project in Munich Great (Un) expectations. · · 2013-09-16The Isar -Plan Project...
State Office for Water ManagementMunich
The Isar -Plan Project in Munich Great (Un) expectations.
European River Restoration Conference
Session 5- Enhancement of Multi-Use Landscapes
11-13 September 2013
State Office for Water ManagementMunich
N. Mahida27.06.2012
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The Isar-Plan Project: Basic Facts
Approximate length of the project= 8 km Planning start 1995 Construction start 2000 Project completed 2011 Successful cooperation between the Free State of Bavaria and the
City of Munich Approximate costs= 35 Mio. € High public acceptance and (ab)use
Présentateur
Commentaires de présentation
Here I will highlight the downside that we currently face with ‚over-use‘ of the restored Isar Floodplains for recreation. Waste production, glass pieces, flattened vegetation, noise, campers, bbq, facilities such as toilets and parking
State Office for Water ManagementMunich
N. Mahida27.06.2012
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Content of this Presentation
Highlights of the Isar-Plan Project Diversity of land use Multiple uses of the Isar through the Isar-Plan Unexpected issues encountered during the project
Présentateur
Commentaires de présentation
Hochwasserschutz herabgesetzte Deichsicherheit (geringes Freibord, Gehölzbewuchs, Befahrbarkeit) Gewässerökologie geringe Längs- und Quervernetzung, begradigt, keine Eigenentwicklung, monotone Gewässerbettstruktur, geringe Lebensraumvielfalt, Artenrückgang, Verlust an Pionierstandorten, geringer Restabfluss, keine Durchgängigkeit Landschaftsbild kanalartiges Erscheinungsbild, keine Blickachsen zum Fluss, fehlende optische Abschirmung unattraktiver Bauwerke Freizeit- und Erholung schlechte Gewässerzugänglichkeit, mangelhafte Badegewässerqualität, fehlende Anbindung an das städtische Umfeld
State Office for Water ManagementMunich
N. Mahida27.06.2012
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The River Isar in Munich
The project area= 8km.
Total area of the river in the city=
14Km
State Office for Water ManagementMunich
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Catchment area 9000 km²
Length 270 km
Medium Low Discharge 40 m³/s
Medium discharge 90 m³/s
Medium high discharge 420 m³/s
High discharge (100 a) 1.100 m³/s
Isar River Sections
1 Upper Isar (alpine Character)
2 Isar in Munich (urban character)
3 Middle Isar (alluvial forest)
4 Lower Isar
5 Danube
Présentateur
Commentaires de présentation
Typical flow of an alpine river- variation between the discharge
State Office for Water ManagementMunich
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Highlights of the Project
Improving dyke security without affecting tree stands Modelling of a river section in a 1:20 model scale Landscape architecture competition UV treatment of water from sewage treatment plants Special method (hydrosaat) for planting saplings Removal of barriers for fish (weir replacement) Follow-up monitoring of ecological revitalistion Stakeholder Involvement and consultation Information system for the public
Présentateur
Commentaires de présentation
Here I will explain how these measures were taken. Ecological monitoring- minimal monitoring report.
State Office for Water ManagementMunich
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Multiple uses of the Isar through the Isar- Plan
Ecological protection zones & monitoring
Recreation & tourist attraction Hydropower Cooling of power plant Improvement of micro-climate Stormwater drainage Canalisation Flood retention Social impacts
State Office for Water ManagementMunich
N. Mahida27.06.2012
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Issues with diversity of land-use
Adaptation of land-use to land demand (for example for recreation, ecological value, public needs)
Historical and cultural value preservation
Urban use versus ecological protection
Management of different interest groups
State Office for Water ManagementMunich
N. Mahida27.06.2012
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Unexpected Issues with the Isar-Plan Project
Conflicting objectives of various stakeholders Contractual deals Timing of public participation Liability issues in case of standing surf wave and potential accidents Land and water ownership Free and public goods are not valued Rule enforcement Awareness is lacking (eg. waste management) Cultural and commercial activities are becoming more popular which
potentially affect biodiversity
Présentateur
Commentaires de présentation
The anglers, the architects, the Ngos, the Canoeists, all parties want to use the Isar and their goals are conflicting. Among the recreation seekers- residents want it quiet- partygoers not. The River and bank management is carried out by city officials and the river belongs to the city in city limits. Out of city limits, the river belongs to the free state of Bavaria. This contractual deals runs for 100 years and is a reason for less influence of State over the maintenance of the project. Enforcement of rules does not work 100 %- BBQ areas need to be aptrolled, driftwood used for campfires, paddleboats not allowed everywhere. The public is pressing for more cultural and commercial activities at the river- which is problematic owing to the status of the flood plains as a protacted area. The greatest issue is the lack of awareness/recognition that the project is actually a free service for the public and should be cherished. However this ‚free‘ service is often misused and assumed to
State Office for Water ManagementMunich
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Thank you for your attention !
Website: http://www.wwa-m.bayern.de/index.htm
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N. Mahida27.06.2012
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Extra Slides- if needed
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Historical Floods in Munich
HQ 1940 = 1.440 m³/s
HQ 1999 = 854 m³/s
HQ 2005 = 1050 m³/s
Historical Events
(above) - Destruction of the Ludwigsbrücke in 1813
(right)- Floods of August 2005
Présentateur
Commentaires de présentation
Destruction of the Ludwigsbrücke in September 1813- The floods of 2005 at the Wittelsbacher bridge
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The Isar in Munich in 1905- an Artists Impression
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The Isar at the same location in 1930
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The Isar in November 2001
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A Balancing Act of the 3 Main Project Goals
Flood protection Near-natural ecological
restoration Recreation & leisure
The baseline reference
situation at the Flaucher
Présentateur
Commentaires de présentation
These goals had a different weightage,
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The Isar-Plan Project
The baseline situation (Flaucher)
Accessible banks
New island
Gravel banks
Species-rich flowering meadows
Stone-blocks for seating
Rock ramps replace sill beams
Dyke reinforcement
Start- Großhesselohe Bridge
End- Cornelius Bridge
Widened river bank
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Two spatial zones of the Isar-Plan: Urban and Semi-urbanThe Semi-Urban River Character
•Focus on biodiversity and rare species
•Flood protection
•Wide bed and gravel banks
•Optimising land-use
Présentateur
Commentaires de présentation
optimising land-use: focus on biodiversity and rare species
State Office for Water ManagementMunich
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Two spatial zones of the Isar-Plan: Urban and Semi-urban
The Urban River Character•Optimising land-use for recreation purposes
•Flood protection for densely urbanised areas
•Improving attractiveness for visitors
Présentateur
Commentaires de présentation
optimising land-use: focus on biodiversity and rare species
State Office for Water ManagementMunich
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Dyke Reinforcement
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Flood Protection Measures
1) Widening the river bed from 50m- 90m2) Increase in dyke height (freeboard)3) Silt deposition removed to the flood meadows4) Near natural design of the banks
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Model Simulation at the TU
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Stakeholder Involvement
Prior to 1990 Isar restoration planning was largely isolated;
Interesting cooperation between government and city/municipal planners and NGO‘s and public groups;
Mediation process to assist identification of the optimal solution for the last 1.5 km of the urban Isar
Présentateur
Commentaires de présentation
Free State of Bayern- the State water office and the deparment for construction at the City municipality cooperated on the project. There were large scale protests to the winner of the landscaping competition that threatened the continuation of the project. The City authorities were not convinced of the initial plan and nor were the Ngos . At the end, the state office for water management drew out plans from the 1st and 2nd winners- a combination of a largely natural plan and a very built-up plan. This was accepted finally and a mediation firm was invited to carry out the process of acceptance.
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AfterBefore
Sill beams on the river bed pose a barrier for fish
Présentateur
Commentaires de présentation
linienhaftes Sperrbauwerk keine biologische Durchgängigkeit eintönige Fließstruktur The sohl rampen – ground sills prevented the river bed from deepening further and were located 200meters apart. 17 of these were remodeled to create continuity for fish
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Before
After
Sloping concrete river banks
Flattened stony river banks
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Before: Monotonous River Landscape
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After : Diversified Bank Structures
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Before- A concrete
channelized water course
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After- more structural
variety and diversity
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Recreation and Leisure at the Isar River
