Sustainable drainage systems

Enfield is both a Lead Local Flood Authority (LLFA) and statutory consultee for planning applications in relation to surface water drainage. As such, we have certain requirements for all planning applications.

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.

If you have any queries, email

Sustainable drainage strategy

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.

You can also use the Enfield geology map (PDF, 1208.53 KB) to check the geology of the site, and use the borough watercourse map (PDF, 2920.33 KB) to check if your development is close to a watercourse.

What a sustainable drainage strategy should include

A sustainable drainage strategy should include the following:

For minor developments such as householder developments, lawful development certification and householder prior approval or notification, follow this minor SuDS pro-forma (XLSM, 1949.3 KB).

For all other developments, follow this SuDS pro-forma (XLSX, 199.6 KB).

Design and evaluation guide

We have developed a Sustainable Drainage Design and Evaluation Guide to make sure new developments comply with our policies.

Flood risk assessment

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, 13784.33 KB) for additional information about requirements for site-specific flood risk assessments.

Our flood management page has more information, and the Environment Agency’s online flood maps has information about the extent of flood risk.

What a flood risk assessment should include

Refer to Appendix 10 of the DMD for a description of the minimum requirements for a site-specific flood risk assessment.

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