Agree with this Policy. It is of particular relevance to the proposed NECAAP proposals (Policy S/NEC) in the areas of highest density, i.e. 300/ha in the central areas, where appropriate SUDS will be needed and the large hard surface areas need to be permeable.
Regarding stormwater management parliament recently put a duty of Sewage Companies to reduce the storm overflows. Major developments, including their highways, should have dedicated separate road, roof and land drains run through balancing /attenuation ponds SUDS methods. as some recent new developments have not been affected by the recent stricture, CWWTP will need to build bigger storage and design it for future more intense rainfall. The stormwater in storage should then be fed back through the works after the storm has finished.