Flood Risk

Ellis Belk is based right on the Poole/Bournemouth coast, so it’s no surprise that we get involved in flood risks and flood alleviation!

In general terms (and setting aside larger scale flood alleviation measures which would fall under civil engineering), the only way of guaranteeing a building’s water tightness under flood conditions would be to fully tank the walls internally and to replace the windows and doors with specialist units. The cost of doing this is prohibitively expensive for most property owners but there are still effective measures to help prevent flood water from entering a building which the following case studies explore.

Under flood conditions, water will enter a building:

  1. by backing up the foul and surface water drainage;
  2. through air bricks and weep holes;
  3. through window and door openings;
  4. and eventually by soaking through the external wall and the party wall of the adjoining property.

Flood Risk and the CSH

The Code for Sustainable Homes encourages developers to build outside the fluvial floodplain to limit the effects of flooding on the built environment. It has been widely reported that as global warming progresses extreme weather conditions will increase the risk of flooding.

Potential credits can be awarded under the CSH . Two credits can be awarded for developing in an area of low flood risk, confirmation of this information is also required in the form of a flood risk assessment. One credit can be awarded for building in an area of medium to high risk where the ground floor level and all access routes are at least 600mm above the design flood level.