State Office for Water Management

The -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 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

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 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