Landeshauptstadt Isar-Plan Munich München Wasserwirtschaftsamt A New Lease of Life for the Isar River München A New Lease of Life for the Isar River presented by: RlfWlfRalf Wulf, Daniela Schaufuß City of Munich, Department of Civil Engineering 11th September 2013 Landeshauptstadt Isar-Plan Munich München Wasserwirtschaftsamt A New Lease of Life for the Isar River München European Watersheds Catchment areas of European Rivers Landeshauptstadt Isar-Plan Munich München Wasserwirtschaftsamt A New Lease of Life for the Isar River München Isar River sections 1 Upper Isar (alpine Character) 2 Isar in Munich (urban character) 3 Middle Isar (alluvial forest) 4 Lower Isar 5 Danube Landeshauptstadt Isar-Plan Munich München Wasserwirtschaftsamt A New Lease of Life for the Isar River München Catchment area 9000 km² Length 270 km Medium Low Discharge 40 m³/s Medium discharge 90 m³/s Medium high discharge 420 m³/s DDiesign fld(flood (100 a) 1.100 m³/s Landeshauptstadt Isar-Plan Munich München Wasserwirtschaftsamt A New Lease of Life for the Isar River München 100 years later Landeshauptstadt Isar-Plan Munich München Wasserwirtschaftsamt A New Lease of Life for the Isar River München Isar in M uni ch ar oun d 1 930 Landeshauptstadt Isar-Plan Munich München Wasserwirtschaftsamt A New Lease of Life for the Isar River München His tor ic Floo ds: collaps of the Ludwigsbridge 13.09.1813 collaps of the Prinzregenten- bridge 1899 Landeshauptstadt Isar-Plan Munich München Wasserwirtschaftsamt A New Lease of Life for the Isar River München Flauchersteg Landeshauptstadt Isar-Plan Munich München Wasserwirtschaftsamt A New Lease of Life for the Isar River München Landeshauptstadt Isar-Plan Munich München Wasserwirtschaftsamt A New Lease of Life for the Isar River München Lake Sylvenstein Landeshauptstadt Isar-Plan Munich München Wasserwirtschaftsamt A New Lease of Life for the Isar River München Major Deficits of „civilized “ Rivers Straightened and Dammed Loss of ecological functions, habitats + groundwater interaction Reduced morphological processes Interruption of physical continuity Minor water qqyuality Cut off floodplains with flood risks No Access to waterline Disturbed interaction between river bed and surrounding landscape Landeshauptstadt Isar-Plan Munich München Wasserwirtschaftsamt A New Lease of Life for the Isar River München a canalized water course Landeshauptstadt Isar-Plan Munich München Wasserwirtschaftsamt A New Lease of Life for the Isar River München The River Isar within Munich: - Canalized river section on both sides with dykes and quaes - flood plains as an important recreational area - Usage of Isar-Water in electric power plants - Reference: Flaucher Landeshauptstadt Isar-Plan Munich München Wasserwirtschaftsamt A New Lease of Life for the Isar River München Landeshauptstadt Isar-Plan Munich München Wasserwirtschaftsamt A New Lease of Life for the Isar River München Targets of Isar-Plans: 1. IifldImproving flood protection Landeshauptstadt Isar-Plan Munich München Wasserwirtschaftsamt A New Lease of Life for the Isar River München Targets of Isar-Plans: 1. IifldImproving flood protection 2. Nature related shaping of the river Isar Landeshauptstadt Isar-Plan Munich München Wasserwirtschaftsamt A New Lease of Life for the Isar River München Targets of Isar-Plans: 1. IifldImproving flood protection 2. Nature related shaping of the river Isar 3. Improving possibilities for recreation Landeshauptstadt Isar-Plan Munich München Wasserwirtschaftsamt A New Lease of Life for the Isar River München ürm W W Isar-Pan Landeshauptstadt Isar-Plan Munich München Wasserwirtschaftsamt A New Lease of Life for the Isar River München • Flood Control – Water Retention Capacity • Restoration – Ecologgpggical Upgrading of the river Isar – Morphological processes – Longitudinal and lateral continuity – Natural habitats, biodiversity, water quality • Recreation – Access to waterline – Attractive landscape and v iew s Landeshauptstadt Isar-Plan Munich München Wasserwirtschaftsamt A New Lease of Life for the Isar River München What it is….. What it is used …. Area of waterway gggyoing by boat swimming Flood plains walking Habitats horse riding barbecuing Gras as protection cross-counttkiiry skiing toboggan Dykes for flood protection partying Maintenance sidewalks cycling walkinggg the dog sun bathing Landeshauptstadt Isar-Plan Munich München Wasserwirtschaftsamt A New Lease of Life for the Isar River München Competition and Workshops: - Mediation - Participants: Administration of the City of Munich an d Bavaria Planning(p)g Teams (Competitors) - Participants: Politicians NGO‘s Landeshauptstadt Isar-Plan Munich München Wasserwirtschaftsamt A New Lease of Life for the Isar River München • Raising and reinforcement of river dikes • Removal of concrete embankments • Widen ing o f the r iver cross section • Increase of capacity in river runoff • Natural river bottom rock ramps or slides with riffles and pools, instead of linear low weirs • Initialization of dynamic river bed processes; development of natural river structures • Longitudinal river continuity to allow river organisms, e.g. fish, to swim upstream • Establishment of typical river habitats Landeshauptstadt Isar-Plan Munich München Wasserwirtschaftsamt A New Lease of Life for the Isar River München Model of the Present Situation in Obernach View from the Tower of the “Deutsches Museum” Landeshauptstadt Isar-Plan Munich München Wasserwirtschaftsamt A New Lease of Life for the Isar River München Modelling the Future: the Art of how to flow Landeshauptstadt Isar-Plan Munich München Wasserwirtschaftsamt A New Lease of Life for the Isar River München Spring 2006 Summer 2013 Landeshauptstadt Isar-Plan Munich München Wasserwirtschaftsamt A New Lease of Life for the Isar River München Improvement of Flood control by 1 Enlargement of river cross-section 2 Elevation of Dikes 3 Removal of sediments in the flooding area Landeshauptstadt Isar-Plan Munich München Wasserwirtschaftsamt A New Lease of Life for the Isar River München Measurements: - Widening the riverbed from 50 m up to 90 m Landeshauptstadt Isar-Plan Munich München Wasserwirtschaftsamt A New Lease of Life for the Isar River München Measurements: - Widening the riverbed from 50 m up to 90 m - rebuildingg( banks (flattenin g,gg, fixing and covering with gravel) Landeshauptstadt Isar-Plan Munich München Wasserwirtschaftsamt A New Lease of Life for the Isar River München bank structure, usual detail: cover sand/gravel/sod Gravel filter bottom fortification Landeshauptstadt Isar-Plan Munich München Wasserwirtschaftsamt A New Lease of Life for the Isar River München Landeshauptstadt Isar-Plan Munich München Wasserwirtschaftsamt A New Lease of Life for the Isar River München Restored Bank Space for morphological processes Backward „hidden“ protection RlfbkRemoval of concrete bank Landeshauptstadt Isar-Plan Munich München Wasserwirtschaftsamt A New Lease of Life for the Isar River München Landeshauptstadt Isar-Plan Munich München Wasserwirtschaftsamt A New Lease of Life for the Isar River München Dynamic River Bed Processes Landeshauptstadt Isar-Plan Munich München Wasserwirtschaftsamt A New Lease of Life for the Isar River München now a ( resto red) river e Gravel banks,,p riffles and pools Natural river slopes River bottom rock ramps / slides Fish bypasses New habitats for flora and fauna Attractive recreation areas Landeshauptstadt Isar-Plan Munich München Wasserwirtschaftsamt A New Lease of Life for the Isar River München Landeshauptstadt Isar-Plan Munich München Wasserwirtschaftsamt A New Lease of Life for the Isar River München Summer in the city Landeshauptstadt Isar-Plan Munich München Wasserwirtschaftsamt A New Lease of Life for the Isar River München Urban river adventures Landeshauptstadt Isar-Plan Munich München Wasserwirtschaftsamt A New Lease of Life for the Isar River München Measurements: - Widening the riverbed from 50 m up to 90 m - rebuildingg( banks (flattenin g,gg, fixing and covering with gravel) - rebuilding river barriers / sills Landeshauptstadt Isar-Plan Munich München Wasserwirtschaftsamt A New Lease of Life for the Isar River München Fish ladder Landeshauptstadt Isar-Plan Munich München Wasserwirtschaftsamt A New Lease of Life for the Isar River München Fish ladder: bypass for fishes, playground for kids Landeshauptstadt Isar-Plan Munich München Wasserwirtschaftsamt A New Lease of Life for the Isar River München Landeshauptstadt Isar-Plan Munich München Wasserwirtschaftsamt A New Lease of Life for the Isar River München Measurements: - Widening the riverbed from 50 m up to 90 m - rebuildingg( banks (flattenin g,gg, fixing and covering with gravel) - rebuilding river barriers / sills - Enhancing dykes Landeshauptstadt Isar-Plan Munich München Wasserwirtschaftsamt A New Lease of Life for the Isar River München Falling over Failure Flooding Landeshauptstadt Isar-Plan Munich München Wasserwirtschaftsamt A New Lease of Life for the Isar River München Enlarging and clearing from trees (under construction) Landeshauptstadt Isar-Plan Munich München Wasserwirtschaftsamt A New Lease of Life for the Isar River München 1 Year after the Measurements Landeshauptstadt Isar-Plan Munich München Wasserwirtschaftsamt A New Lease of Life for the Isar River München Landeshauptstadt Isar-Plan Munich München Wasserwirtschaftsamt A New Lease of Life for the Isar River München 4. Pulling back the Drill 5. Installing Girders, a = 3,0 m 2. Dr illing the Slo t 3. Mashing Ground and Suspension 6. Concreting the Top 1. Pre- Excavation Landeshauptstadt