natural flood defences rhine/meuse wouter helmer ark foundation
TRANSCRIPT
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Natural Flood Defences
Rhine/Meuse
Wouter Helmer
Ark Foundation
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Ark Foundationnature and landscape development• More room for natural processes
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Ark Foundationmain principles
• More room for natural processes• (Economic) Partnerships
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Ark Foundationmain principles
• More room for natural processes• (Economic) Partnerships• Local commitment
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Ark Foundationworking method
Regional vision Local examples
Upstream: Ambleve (Ardennes)‘Mountains of Water’ Geulle (Limburg-NL)
Downstream Millingerwaard‘Living Rivers’ (Gelderse Poort)
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Mountains of Water
• Retention in brooks (Ambleve, Ourthe, Geulle, Worm, Ober-Main)
• Waterretention in lower mountains (Ardennes,
Eiffel, Schwarzwald)
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Mountains of Water
• Waterretention in lower mountains (Ardennes,
Eiffel, Schwarzwald)
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Mountains of Water
• Waterretention in lower mountains (Ardennes, Eiffel, Schwarzwald)
Meuse: reduction of discharge by restoration of the natural sponges in brooklets Ardennes :
3000-3500 m3/s Borgharen: ca.6 % reduction!
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Mountains of Water
- Remove campshedding- Let falling trees deregulate stream- Clay-layer from centuries of unnatural
sedimentation will be removed by the brook
Retention in brooks (Ambleve, Ourthe, Geulle, Worm, Ober-Main)
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Mountains of water
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Mountains of Water
• Retention in brooks (Ambleve, Ourthe, Geulle, Worm, Ober-Main)
1924 1975 1989
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Mountains of Water
Retention in brooks (Ambleve, Ourthe, Geulle, Worm, Ober-Main)
Meuse: reduction of discharge by restoration of the natural floodplains of the larger brooks:
3000-3500 m3/s Borgharen: ca. 5 % reduction!
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Living Rivers
• Clay excavation
• Sidechannels• Herbivory
• Cyclic rejuvenation
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Living Rivers
• Clay-excavation
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Living Rivers
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Living Rivers
• 50.000 new houses = ca.150 ha new nature
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Living Rivers
• Sidechannels
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Living rivers
• 220 km new side channels• Compensation for natural vegetation and new
riverdunes
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Living Rivers
• Herbivory
Wild horses and cattleanimal/2-4 ha yearrounddelay of forest development
Beaver4000 kg/year/beaverlocal clearcutting of riverine forestsfacilitates grazing
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Living Rivers
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Living Rivers
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Living Rivers
16.000 m3/s: solutions within Riverforelands
18.000 m3/s: Old Rhine/Linge-floodplain
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Living Rivers