The Isar -Plan Project in Munich Great (Un) Expectations
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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 State Office for Water Management Munich 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 N. Mahida 2 27.06.2012 State Office for Water Management Munich 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 N. Mahida 3 27.06.2012 State Office for Water Management Munich The River Isar in Munich The project area= 8km. Total area of the river in the city= 14Km N. Mahida 4 27.06.2012 State Office for Water Management Munich Catchment area 9000 km² Isar River Sections Length 270 km 1 Upper Isar (alpine Character) Medium Low Discharge 40 m³/s 2 Isar in Munich (urban character) Medium discharge 90 m³/s 3 Middle Isar (alluvial forest) Medium high discharge 420 m³/s 4 Lower Isar High discharge (100 a) 1.100 m³/s 5 Danube N. Mahida 5 27.06.2012 State Office for Water Management Munich 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 N. Mahida 6 27.06.2012 State Office for Water Management Munich 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 N. Mahida 7 27.06.2012 State Office for Water Management Munich 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 N. Mahida 8 27.06.2012 State Office for Water Management Munich 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 N. Mahida 9 27.06.2012 State Office for Water Management Munich Thank you for your attention ! Website: http://www.wwa-m.bayern.de/index.htm N. Mahida 10 27.06.2012 State Office for Water Management Munich Extra Slides- if needed N. Mahida 11 27.06.2012 State Office for Water Management Munich Historical Floods in Munich Historical Events HQ 1940 = 1.440 m³/s HQ 1999 = 854 m³/s (above) - Destruction of the Ludwigsbrücke in HQ 2005 = 1050 m³/s 1813 (right)- Floods of August 2005 N. Mahida 12 27.06.2012 State Office for Water Management Munich The Isar in Munich in 1905- an Artists Impression N. Mahida 13 27.06.2012 State Office for Water Management Munich The Isar at the same location in 1930 N. Mahida 14 27.06.2012 State Office for Water Management Munich The Isar in November 2001 N. Mahida 15 27.06.2012 State Office for Water Management Munich A Balancing Act of the 3 Main Project Goals The baseline reference situation at the Flaucher Flood protection Near-natural ecological restoration Recreation & leisure N. Mahida 16 27.06.2012 End- Cornelius Bridge State Office for Water Management Munich Accessible banks New island Gravel banks Dyke reinforcement The Isar-Plan Project The baseline situation (Flaucher) Widened river bank Rock ramps replace sill beams Stone-blocks for seating Species-rich flowering meadows Start- Großhesselohe Bridge N. Mahida 17 27.06.2012 State Office for Water Management Munich Two spatial zones of the Isar-Plan: Urban and Semi-urban The Semi-Urban River Character •Focus on biodiversity and rare species •Flood protection •Wide bed and gravel banks •Optimising land-use N. Mahida 18 27.06.2012 State Office for Water Management Munich 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 N. Mahida 19 27.06.2012 State Office for Water Management Munich Dyke Reinforcement N. Mahida 20 27.06.2012 State Office for Water Management Munich Flood Protection Measures 1) Widening the river bed from 50m- 90m 2) Increase in dyke height (freeboard) 3) Silt deposition removed to the flood meadows 4) Near natural design of the banks N. Mahida 21 27.06.2012 State Office for Water Management Munich Model Simulation at the TU N. Mahida 22 27.06.2012 State Office for Water Management Munich 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 N. Mahida 23 27.06.2012 State Office for Water Management Munich Sill beams on the river bed pose a barrier for fish Before After N. Mahida 24 27.06.2012 State Office for Water Management Munich Before Sloping concrete river banks Flattened stony river banks After N. Mahida 25 27.06.2012 State Office for Water Management Munich Before: Monotonous River Landscape N. Mahida 26 27.06.2012 State Office for Water Management Munich After : Diversified Bank Structures N. Mahida 27 27.06.2012 State Office for Water Management Munich Before- A concrete channelized water course N. Mahida 28 27.06.2012 State Office for Water Management Munich After- more structural variety and diversity N. Mahida 29 27.06.2012 State Office for Water Management Munich Recreation and Leisure at the Isar River N. Mahida 30 27.06.2012.