Enfield flood drainage work helping to create a wetland habitat in woodland on Monken Hadley Common

Reeds and other wetland grasses and flowers have been planted along the edges of flood relief drainage work in Hadley Woods which has been carried out by Enfield Council with the help of volunteers from Monken Hadley Common Trust.

New pipework and other excavations are designed to end flash flooding in Parkgate Avenue, off Camlet Way, and improve badly drained marsh land close by in the woods which is often inaccessible in wet winter weather.

Plans were first drawn up in 2018 to relieve flooding in nearby houses.

After discussions with the Common Trust and Barnet Council, Enfield gave the go ahead for the construction of a new surface water drainpipe under the footpath that leads to the common at the junction of Parkgate Avenue and Crescent.

A wetland cell – or holding pond – has been created along with a water course through the woods which connects up to Green Brook and leads on to the stream that runs close to Jack’s Lake.

Footpaths around the area have been raised and laid out with wood chips so as to provide year-round access through the woods.

Michael Shorey, Enfield’s senior engineer in water courses, briefed volunteers before they set to work.

He explained that the aim of the scheme was to divert excess flood water through the new pipe under the footpath so that it entered the wet land cell and could then spill into a floodable landscaped wetland area reducing the flow into Green Brook.

Martin Jones (far right), a landscape architect with Enfield Council, said the importance of wetland and marginal aquatic planting was that it enhanced the water quality and added to biodiversity.

A range of pond-edge plants and wildflowers could be used in such locations and could tolerate periods of dry weather.

Roger De La Mare, co-curator of Monken Hadley Common, welcomed the completion of Enfield’s sustainable drainage scheme for Parkgate Avenue and the chance to carry out aquatic planting.

“We have had to lose several mature trees to make way for the pipework and the holding pond, but it has opened up an area which now has great potential, especially with the new raised footpaths.

“The tree canopy in much of the common does make it very dark below and that leaves us with a lot of brambles and holly, so a wetland area like this which has been laid out with aquatic plants is very appealing.”

A chance to take part in the scheme was an opportunity for Anna Colligan (left) to work with Enfield engineer Sarah Dillon to discover more about urban drainage schemes.

Anna is studying water management and the environment at Queen Mary University and was keen to volunteer.

Two Trust volunteers – Peter Davies (left) and David Littlewood – said they were pleased to see such a good turn out as it helped to get across the message that they wanted local people to get involved in looking after Monken Hadley Common.

Nearby residents Maurice and Esther Kurland said the completion of the drainage scheme would be a great relief to some of their neighbours who had suffered from flash flooding in their properties.

“At long last there is now in place a drainage system to take the surplus water and we know how much that will be appreciated.

“Sorting out the drainage and building up the footpaths is a great improvement as this part of the common is often impassable in the winter because of all the mud. Hopefully that will all be sorted and the landscaping and planting will be a real improvement.”