Guidance

Sustainable drainage systems: non-statutory technical standards

Non-statutory technical standards for the design, maintenance and operation of sustainable drainage systems to drain surface water.

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This document contains non-statutory technical standards for the design, maintenance and operation of sustainable drainage systems. Systems to drain surface water from housing, non-residential or mixed use developments for the lifetime of the developments.

Sustainable drainage systems slow the rate of surface water run-off and improve infiltration, by mimicking natural drainage in both rural and urban areas. This reduces the risk of “flash-flooding” which occurs when rainwater rapidly flows into the public sewerage and drainage systems.

In December 2014, DCLG set out the changes to the planning system that will help to increase the use of the sustainable drainage systems.

This document should be used in conjunction with the National Planning Policy Framework and Planning Practice Guidance.