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River Mimram re-gravelling project completed!

Posted: Friday 13th December 2013 by Living Rivers

Gravel goes into the riverGravel goes into the river

Silt out, gravel in!

Last week we completed a river restoration project on the River Mimram at Singler's Marsh, Welwyn.  The site, owned by Welwyn Hatfield Borough Council, is one of the few places where the public can access the Mimram, and is also a valuable local wildlife site.  Unfortunately, historic dredging had removed almost all the lovely gravel which would naturally form the bed of the river.  Instead, the river bed was completed silted up, with no habitat for invertebrates or spawning fish.

Our project, funded by Natural England and WelHat Borough Council, removed around sixty tonnes of silt and replaced it weight for weight with gravel, recreating four stretches of gravel riffle.  I made a short film charting the implementation of the project, which I hope you enjoy:

 

This project builds on previous work carried out on the site over the past year, to remove some of the over-shading scrub and trees, and to install coir rolls to narrow the channel and promote the growth of bankside vegetation.

It is such a great feeling to see the transformation of this stretch of river, and to receive so much positive feedback from local people.  There are lots more practical projects planned for the next six months or so...watch this space for updates!

Charlie

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