Saturday, 16 May 2015

Thinking Dutch on flood defence

The Dutch think big! Why can’t we do the same?  A short trip over to The Netherlands for a meeting with the Dutch Birdlife partner Vogelbescherming Nederland (VBN) was a suitable excuse for a couple of site visits. First on the itinerary was a Black-tailed Godwit hotspot at Eemland where 200+ pairs nest on a typically open, wet meadow habitat.  Godwits are increasingly restricted to nature reserves where high water levels are maintained and this reserve is a great example of management for meadow birds.

Continuing north, we came to our main destination outside of the town of Groningen where a massive total of 3,000 ha of wetland habitat has been created as a flood defence scheme for the town.  The waters of the local rivers flow north towards the Wadden Sea.  Historically the low areas around Groningen supported a large peat bog habitat.  Attempts to drain the area started in the Middle Ages and the last 100 years has seen the area managed as pasture.  However, Groningen has a history of serious flooding when river levels have been high.  The local water board Noorderzijlvest looked for a flood defence area, a 'washland', in order to protect the town.  They concluded that the area to the south west of Groningen called De Onlanden area was most suited to fit their requirements. The area was mainly under the control of farmers or conservation organizations. A partnership of organisations was formed and in 2009 the new flood defence scheme was initiated. 

There are two main areas that we looked at: De Onlanden and an area near Zuidlaardermere.  Flood waters are stored in these areas to various depths of up to 1m.  How is this different from washlands in the UK? The key factor is there is an agreement that a level of water is retained into the spring, creating fen, reed and open water habitats.  This brings a win-win situation; flood storage and wildlife-rich wetland habitat. And wow, is this a win for wildlife. 250+ pairs of Black-necked Grebes, breeding Whiskered and White-winged Black Terns, 16 booming Bitterns, Corncrake, Baillon’s, Little and Spotted Crake, 120 prs of Bluethroat, 100prs of Grasshopper Warblers and 150 prs of Marsh Warbler. But this area is not just for wildlife; it is now extensively used by local people for cycling, walking, fishing etc.

In the UK we have numerous washlands, but none deliver like De Onlanden, ours are drained down in the name of maintaining storage capacity. Why can’t we think big and imaginatively like the Dutch?

1 comment:

Darren said...

Wow. Those 'crazy' Dutchfolk. I might have to migrate eastwards to the polders. Have you read 'Brilliant Orange?' As a lover of good football (apparently), you should, if you haven't already. As Johann Cruyff probably said about both beautiful football and habitat management...''it'sh all about creating shpashe...'''