Sustainable drainage strategy

When is one required?

A SUDS strategy is required for any development of: 

• 1 or more new dwellings. 
• A construction footprint exceeding 100m2 (not householder)

What must it include?

The report must demonstrate that the development has followed the SUDS hierarchy for surface water disposal as required by JCS Policy INF2 (Flood Risk Management) and provides SUDS with multifunctional benefits (Water quantity, Water quality, Amenity, and Biodiversity). 

The strategy must include: 

• Proposed post-development surface water flows and volume, including a comparison with pre-development values. 
• A drainage design layout plan including proposed design levels. 
• An exceedance flow route plan identifying safe surface water flow routes through the site should the capacity of the drainage system be exceeded. 
• Proposals for maintenance and management of SUDS

NB. For single dwellings a high-level strategy identifying the method of surface water disposal off the site (following the SUDS hierarchy) may be acceptable - with detailed technical aspects instead deferred by Planning condition.