Policy information sourced from the Harrow Development Management Policies
DM 10: On Site Water Management and Surface Water Attenuation
Proposals for new development will be required to make provision for the installation and management of measures for the efficient use of mains water and for the control and reduction of surface water run off. Substantial weight will be afforded to the target for mains water consumption of 105 litres or less per person per day and to the achievement of greenfield run off rates. Where greenfield run- off rates cannot be achieved this should be clearly justified by the applicant; however the fact that a site is previously developed and has an existing high run-off rate will not constitute justification.
The design and layout of major development proposals will be required to:
- use appropriate sustainable drainage measures to control the rate and volume of surface water run-off;
- ensure separation of surface and foul water systems;
- make reasonable provision for the safe storage and passage of flood water in excessive events; and
- demonstrate adequate arrangements for the management and maintenance of the measures used.
Proposals for minor developments, householder development, and conversions should make use of sustainable drainage measures wherever feasible and must ensure separation of surface and foul water systems.
Proposals that would fail to make adequate provision for the control and reduction of surface water run off will be refused.
For more information please see the Development Management Policies