Case study:Isar-Plan

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Location: 48° 7' 40.09" N, 11° 34' 41.73" E

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Project overview

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Status	Complete
Project web site	http://www.wwa-m.bayern.de/projekte_und_programme/isarplan/index.htm
Themes	Flood risk management, Habitat and biodiversity, Hydropower, Hydromorphology, Land use management - forestry, Monitoring, Social benefits, Spatial planning, Water quality
Country	Germany
Main contact forename	Nick
Main contact surname	Elbourne
Main contact user ID	User:NickRRC
Contact organisation	State Office for Water Management Munich
Contact organisation web site	http://www.wwa-m.bayern.de/index.htm
Partner organisations	City of Munich
Parent multi-site project
This is a parent project encompassing the following projects	No

Straightened Isar (left) and restored diversified channel (Right)

Project summary

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The Isar Plan Project is a river restoration project on a stretch of 8Km in the inner city of Munich. The Project was initiated in 2000 and the last site was completed by 2011. The three main goals of the project were: 1) Flood protection 2) Enhancing Species diversity and ecological restoration 3) Improving leisure and recreation

The project is being currently monitored.

Monitoring surveys and results

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Lessons learnt

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Catchment and subcatchment

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Catchment

River basin district	Danube
River basin	Isar

Subcatchment

River name	Isar
Area category	1000 - 10000 km²
Area (km2)	90009,000 km² <br />900,000 ha <br />
Maximum altitude category	1000 - 2000 m
Maximum altitude (m)
Dominant geology	Siliceous
Ecoregion	Central Highlands
Dominant land cover	Alluvial Forest Vegetation
Waterbody ID

Site

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Name	Munich
WFD water body codes	DE16_147237_173317
WFD (national) typology	Type 4 "gravel and stone embossed flow of the Alpine foothills"
WFD water body name
Pre-project morphology	Straight, Revetments, Embanked, Impounded
Reference morphology	Braided, High width:depth
Desired post project morphology
Heavily modified water body	No
National/international site designation	Germany - Landschaftschutzgebiet
Local/regional site designations	Landschaftsschutzgebiet/ Naturschutzgebiet
Protected species present	Yes
Invasive species present	Yes
Species of interest	European green toad (Bufo viridis), little ringed plover (Charadrius dubius), Fish: huchen (Hucho hucho), nase (Chondrostoma nasus), grayling (Thymallus thymallus), burbot (Lota lota), brown trout (Salmo trutta), barbel (Barbus barbus) and chub (Leuciscus cephalus). Flora.rock roses (Helianthemum spp.), broomrapes (Orobanche spp.), meadow clary (Salvia pratensis), quaking grass (Briza media) and the Carthusian pink crocus (Dianthus carthusianorum) Butterflies:Idas blue (Plebejus idas) and common blue (Polyommatus icarus)
Dominant hydrology	Quick and varying run-off
Dominant substrate	Gravel- largely limestone
River corridor land use	Urban, Forest, Flood plains
Average bankfull channel width category	more than 50 m
Average bankfull channel width (m)
Average bankfull channel depth category	0.5 - 2 m
Average bankfull channel depth (m)
Mean discharge category	10 - 100 m³/s
Mean annual discharge (m3/s)	63.763.7 m³/s <br />63,700 l/s <br />
Average channel gradient category
Average channel gradient
Average unit stream power (W/m2)

Project background

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Reach length directly affected (m)	8000 m8 km <br />800,000 cm <br />
Project started	1998/01/01
Works started
Works completed	2011/08/31
Project completed
Total cost category	more than 10000 k€
Total cost (k€)	35000€35 k€ <br />
Benefit to cost ratio
Funding sources	City of Munich, Free state of Bavaria

Cost for project phases

Phase	cost category	cost exact (k€)	Lead organisation	Contact forename	Contact surname
Investigation and design	more than 10000 k€		State Office for Water Management Munich	Matthias	Junge
Stakeholder engagement and communication	more than 10000 k€		City of Munich	Peter	Schaller
Works and works supervision	more than 10000 k€		State Office for Water Management Munich	Stefan	Kirner
Post-project management and maintenance	more than 10000 k€		State Office for Water Management & City of Munich
Monitoring	more than 10000 k€		State Office for Water Management

Reasons for river restoration

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Mitigation of a pressure	Riparian development
Hydromorphology	Structure & condition of riparian zones, Continuity of sediment transport, Quantity & dynamics of flow
Biology	Fish: Abundance, Habitats, Invertebrates: Disturbance-sensitive species
Physico-chemical	Bathing water quality
Other reasons for the project	Improvement of Flood Protection, Landscape enhancement, Recreation

Measures

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Structural measures
Bank/bed modifications	Gravel banks reintroduced, Re-grading of banks, Removal of concrete bank protection at several sites, widening of river bed, deepening of river floor
Floodplain / River corridor	Large scale planting of native species, Widening of flood corridor
Planform / Channel pattern	Channel widening, Creation of willow island, Creation of braided channel, Allow future natural channel changes to occur
Other	embedding of rootballs and tree trunks, creation of new bicycle path, natural seating stones places on banks
Non-structural measures
Management interventions	Waste management, provision of temporary toilet facilities
Social measures (incl. engagement)	information for the public
Other

Monitoring

Hydromorphological quality elements

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quality elements

Element	When monitored		Type of monitoring		Control site used	Result
	Before measures	After measures	Qualitative	Quantitative
Structure & condition of riparian zones		Yes	Yes			Improvement
Continuity of sediment transport		Yes	Yes			Improvement

Biological quality elements

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quality elements

Element	When monitored		Type of monitoring		Control site used	Result
	Before measures	After measures	Qualitative	Quantitative

Physico-chemical quality elements

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quality elements

Element	When monitored		Type of monitoring		Control site used	Result
	Before measures	After measures	Qualitative	Quantitative

Any other monitoring, e.g. social, economic

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Element	When monitored		Type of monitoring		Control site used	Result
	Before measures	After measures	Qualitative	Quantitative
Public use	Yes	Yes	Yes			Improvement

Monitoring documents

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Image gallery

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Additional documents and videos

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Additional links and references

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Link	Description

Supplementary Information

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