River Landscape

In the river landscape the measures consist of de-poldering and the removal of summer dikes, the creation of high tide channels and the lowering of the shore. This results in a flood plain. Upstream flowing storage can be used and new rivers may be developed. At the spring of the river measures, which increase the sponge function need to be realised. This requires international cooperation, because most of the time these areas are located outside the Netherlands.

Near the Biesbosch the river meets the tides of the sea. Originally, this area functioned like a huge and resilient sweet water tidal zone with creeks and channels. This made it possible for the area to move along with the natural dynamics and adapt to a rising sea level and increased river discharges. Because the tidal influence has disappeared, due to the disconnection of large parts of the Biesbosch from the sea, the area became static and loses its function to buffer for high tidal discharges. The natural dynamic of the area can be revitalised by creating a new high tide channel or the emergence of creeks and little channels in a natural way (Bureau Stroming, 2006). An example, where these principles will be realised is the Zuiderklip, which used to be the fourth dinking water basin in the Biesbosch area. The flood and tidal dynamics will be restored by the creation of a robust flowing channel (Figs. 5.26 and 5.27).

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Fig. 5.26 Lay out of Zuiderklip (Source: www.dezuiderklip.nl)
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Fig. 5.27 Detail design Zuiderklip (Source: www.dezuiderklip.nl)

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