Flood management for developers
How to manage flood risk when planning a new development.
You should consider appropriate drainage systems early in the design phase for any new developments you are planning.
Read our developers' guide for surface water management that covers:
- our flood risk and drainage requirements
- guidelines for hydraulic calculations
- guidelines for selecting sustainable drainage systems
- common issues encountered with planning submissions
Also read more about how we manage the risk of flooding in Southwark.
When making a planning application you must consider sustainable drainage like:
- ponds
- green roofs
- soakaways
- swales
Sustainable drainage puts as much water back into the ground as possible, to:
- maintain healthy aquifers
- reduce the risk of flooding and drought
- improve water quality
Major new developments should include a completed sustainable drainage proforma. You can download a template for this from the London Mayor's website.
Download the sustainable drainage proforma template (XLSX, 322 KB)
We recommend that you have discussions with us before you submit a planning application.