15. Chesham flood alleviation project - Pednormead End

Aims: Manage flow; Work together

Water body: River Chess
Project description

Project to reduce the risk to residential properties from fluvial and surface water flooding in the Pednormead End area of Chesham.

 Based on historic records of flooding, site investigation and detailed modelling, Buckinghamshire County Council's Surface Water Management Plan (SWMP) for Chesham identified a severe risk of frequent flooding to several properties at Pednormead End, near the junctions of Missenden Road, Pednor Road, Church Street and Wey Lane. Flooding is likely to be due to a combination of surface water runoff from Missenden and Pednor Roads and flows in the River Chess exceeding the capacity of the culvert under Missenden Road. Both of these sources are likely to be exacerbated during high groundwater levels.

In addition to the properties which flooded in 2014 being offered Individual Property Protection through the government’s repair and renew grant, a successful Partnership Funding bid in 2014 have made funds available to begin a feasibility study into a community scheme to improve flood risk management.

 The purpose of the study is to assess the feasibility of a flood alleviation scheme comprising of the following elements:

  1. Surface water from Missenden Road could be routed into a swale on the north side of the road, potentially with reed beds within the swale to remove pollutants and sediment from the runoff. Options for reprofiling Pednor Road adjacent to Chesham Tennis and Squash Club can be assessed.
  2. In-stream measures to reconnect channel and floodplain by making the channel less incised and using natural floodplain storage for use in more frequent events. The measures could include placing in-stream woody material, raising the bed, encouraging rifles and reprofiling the banks. The floodplain could be reprofiled to store more water by creating scrapes and low banks. These measures could create up to 1ha of water related habitat.

 

Project lead: Buckinghamshire County Council
Project partners: Chilterns Chalk Streams Project, Environment Agency, River Chess Association, Transport for Bucks, Chesham Flood Action Group, Chiltern Society
Contact for more information: This email address is being protected from spambots. You need JavaScript enabled to view it.
Project start: 1st November 2014
Project end: 31st March 2017
Funding source: Defra Flood Defence Grant in Aid , Buckinghamshire County Council

Design by LTD Design Consultants and build by Garganey Consulting. From an original concept by the Herts and Middlesex Wildlife Trust.