The human version (we wrote this, not the council)
This policy requires high-quality sustainable drainage systems, known as SuDS, across whole development sites to manage rainwater and cut flood risk. A drainage strategy must show that runoff is handled close to where it falls, that properties would not flood in a storm with a 1% chance of occurring in any year, allowing for climate change, and that flood risk is not increased on site or elsewhere. Blue-green corridors should be kept and improved, and brownfield sites should disconnect from combined sewers wherever feasible.
An unofficial plain English summary. The official wording below is
what counts at examination; check it before you rely on anything here.
The text below is extracted automatically from the official PDF and may
contain artefacts; the PDF is authoritative.
ins can be both.
Policy ID.12
Multifunctional Sustainable Urban Drainage Systems
High-quality, multi-functional Sustainable Drainage Systems
(SuDS) must be implemented proportionately across the whole site
to manage surface water runoff, reduce flood risk and deliver wider
environmental benefits.
A. Drainage Strategy
Development proposals must demonstrate, through a Drainage Strategy, that:
1. surface water runoff will be managed as close to source as possible;
2. there will be no flooding of properties from all sources up to and including the
1% Annual Exceedance Probability (AEP) event, plus appropriate allowance for
climate change; and
3. development will not increase flood risk on-site or to the surrounding areas
Proposals must give early consideration to overland flow routing when designing site
layouts. Development should be sympathetic to existing watercourses and surface
water flow paths. Blue-green corridors should be retained and enhanced to reduce
flood risk, improve water quality, support biodiversity and provide amenity space, and
aligned with the Local Nature Recovery Strategy priorities. Development proposals
must protect and improve the quality of water bodies.
On brownfield sites, development must be disconnected from surface water and
highway drainage from combined sewers wherever feasible.