Policy information sourced from Enfield Development Managament Document (DMD)

DMD 60 Assessing Flood Risk

1. Requirements for a site specific

Flood Risk Assessment Site specific Flood Risk Assessments will be required for the following:

  • Development proposals of 1 hectare or greater in Flood Zone 1;
  • All proposals for new development located in Flood Zones 2 and 3; and
  • All proposals in groundwater flood risk areas that involve the creation of useable space below ground;
  • All proposals for new development identified as being at risk from surface water flooding in the SWMP; or
  • Any development that may be subject to other sources of flooding identified in subsequent reviews/updates of the evidence base on flooding.

These FRAs must:

  • Where applicable, provide evidence so that the Council can assess whether the requirements of the sequential test of sites across the borough are met, and where an exception test is required, demonstrate that:
    • The development would provide wider sustainability benefits to the community that outweigh flood risk;
    • The development is on developable previously-developed land or, if this is not the case, that there are no reasonable alternative sites on developable previously-developed land; and
    • The development will be safe (see paragraph 8.5.18), without increasing flood risk elsewhere, and, where possible, will reduce flood risk overall.

2. Additional requirements for non fluvial flooding

  • Where developments are proposed in areas identified as being at risk of groundwater flooding, consideration should be given to prevention or mitigation measures and the Council may require developers to submit further details to determine the extent of risk and the requirements for mitigation.
  • Development proposals should provide a sustainable drainage strategy to demonstrate the requirements of DMD 61 ‘Managing Surface Water’ and demonstrate that sewer flooding will not occur as a result of the development.

Developments at risk of flooding need to make sure they are safe and incorporate appropriate mitigation measures in line with DMD 62 ‘Flood Control and Mitigation Measures’ and DMD 63 ‘Development adjacent to or affecting watercourses’ and have regard to specific measures identified in the SFRA.

This Policy should be read in conjunction with Core Strategy Policy 28.

For more information please see the Development Managament Document (DMD)