Natural Flood Defences Rhine/Meuse Wouter Helmer Ark Foundation.

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Presentation transcript:

Natural Flood Defences Rhine/Meuse Wouter Helmer Ark Foundation

Ark Foundation nature and landscape development More room for natural processes

Ark Foundation main principles More room for natural processes (Economic) Partnerships

Ark Foundation main principles More room for natural processes (Economic) Partnerships Local commitment

Ark Foundation working method Regional vision Local examples Upstream:Ambleve (Ardennes) ‘Mountains of Water’Geulle (Limburg-NL) DownstreamMillingerwaard ‘Living Rivers’(Gelderse Poort)

Mountains of Water Retention in brooks (Ambleve, Ourthe, Geulle, Worm, Ober-Main) Waterretention in lower mountains (Ardennes, Eiffel, Schwarzwald)

Mountains of Water Waterretention in lower mountains (Ardennes, Eiffel, Schwarzwald)

Mountains of Water Waterretention in lower mountains (Ardennes, Eiffel, Schwarzwald) Meuse: reduction of discharge by restoration of the natural sponges in brooklets Ardennes : m3/s Borgharen: ca.6 % reduction!

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)

Mountains of water

Mountains of Water Retention in brooks (Ambleve, Ourthe, Geulle, Worm, Ober-Main)

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: m3/s Borgharen: ca. 5 % reduction!

Living Rivers Clay excavation Sidechannels Herbivory Cyclic rejuvenation

Living Rivers Clay-excavation

Living Rivers

new houses = ca. 150 ha new nature

Living Rivers Sidechannels

Living rivers 220 km new side channels Compensation for natural vegetation and new riverdunes

Living Rivers Herbivory Wild horses and cattle animal/2-4 ha yearround delay of forest development Beaver 4000 kg/year/beaver local clearcutting of riverine forests facilitates grazing

Living Rivers

m3/s: solutions within Riverforelands m3/s: Old Rhine/Linge-floodplain

Living Rivers