Enfield is both a Lead Local Flood Authority (LLFA) and a statutory consultee for major planning applications in relation to surface water drainage. As such, we have certain requirements for all planning applications of this kind.
The first is that you submit a sustainable drainage strategy that demonstrates how sustainable drainage systems (SuDS) will be used to manage rainfall runoff.
The second requirement is that, if the development is in a flood risk area, you submit a flood risk assessment. This is to ensure that new development is safe from flooding, does not increase flood risk elsewhere and reduces overall flood risk.
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A sustainable drainage strategy details how surface water runoff and waste water arising from the development of a site will be managed in line with the development plan. See our Development Management Document (DMD) for further information, particularly DMD policies 59 to 62.
A sustainable drainage strategy should include the following:
Follow this pro-forma (XLSX) to ensure that the above points are met for your development.
We have developed a Sustainable Drainage Design and Evaluation Guide to make sure new developments comply with our policies.
A flood risk assessment considers the possible impacts of all sources of flooding on a new development – this includes river flooding and surface water flooding. It must demonstrate that the development is safe and does not increase flood risk elsewhere. Refer to the DMD and Enfield’s Strategic Flood Risk Assessment (PDF) for additional information about requirements for site-specific flood risk assessments.
Refer to Appendix 10 of the DMD for a description of the minimum requirements for a site-specific flood risk assessment.