Drainage Strategies

Assessing the impacts of surface water and foul drainage posed by new developments is a crucial part of the planning process even if the proposed site is not at risk of flooding. A drainage strategy addresses the management of surface water run-off as well as foul drainage leaving new developments to ensure they do not increase flood risk elsewhere and stay within allowable discharge rates.

The purpose of a drainage strategy or assessment is to identify any challenges associated with surface water and foul drainage from new developments are captured, detailed and proven to be effectively dealt with.

Drainage Strategies will over the following:

· A review of the existing site drainage, if applicable.

· Assess the pre-development surface water run-off rates against post-development rates.

· Determine allowable foul drainage discharge rates in line with the local sewerage operator guidelines.

· Provide options for attenuation of surface water, if required.

· Assess the capacity of the local foul drainage system to see if an upgrade is necessary.

· Provide recommendations following initial assessment with regard to detailed design.

Drainage strategies can form part of a flood risk assessment or be individually produced where an FRA has already been completed or is not required.