Planning policy and the National Planning Policy Framework sets out a number of key provisions relating to sustainable drainage systems (SuDS).
Planning Practice Guidance on sustainable drainage can be viewed here.
Defra's Non-statutory technical standards for the design, maintenance and operation of sustainable drainage systems to drain surface water are available here.
Industry guidance, published by the Local Authority SuDS Officer Organisation (LASOO), is available here.
CIRIA's SuDS Manual, the most comprehensive industry SuDS guidance available in the UK, can be downloaded for free.