A surface water drainage strategy will outline how you plan to manage onsite water runoff. If you plan to manage this with sustainable or natural elements, you can include a sustainable drainage strategy as part of this statement, and within the larger flood risk assessment.
Requirements
A surface water drainage strategy is required for:
- Major developments
- Developments subject to a requirement for sustainable drainage solutions to be provided, as set out in a ‘made’ Neighbourhood Plan
- Minor development within an area liable to flood from all sources of flooding including surface water, ground water or flood zones 2 and 3 as shown on the online Planning Map.
- Minor development that is likely to increase flood risk locally
Not required for householder development.
Details should be submitted to demonstrate:
- how all surface water affects a site and the surrounding area
- how water behaves on a site, such as surface water runoff rate, flow pathways, and infiltration potential (the likelihood of water being soaked into the ground).
- what effect the development will have on the above issues
- the measures proposed so that runoff rates meet the requirements for the site set by national and local planning policy