Flood Risk
According to the Environment Agency Flood Map, the majority of the Site is in Flood Zone 1, which has the lowest probability of flooding. There is an area of Flood Zone 2 located within the centre of the Site, and to the east associated with the Brook. There is a small isolated area of surface water flood risk in the centre of the Site.
It is considered that the risk of flooding is not significant based on the nature of the site and the surrounding area. Mitigation measures will be considered as part of the development proposals, where necessary. These would include raising of ground level, in certain locations, separation of development from the Crane Brook and using areas at risk of flooding for open space or nature conservation purposes.
No other sources of flooding have been identified which are considered to pose a significant risk to the development.
Drainage
Surface Water
Current legislation and guidance require developers to manage surface water run-off from new development, to mitigate flood risk to the site and surrounding area and to provide a sustainable means of disposing of run-off from impermeable areas of the site.
Surface water run-off from the new development should be managed via the design of a sustainable drainage system (SuDS). The possible drainage options considered for the site include the use of infiltration methods and discharging to a local watercourse or public sewer network.
Based on currently available information, it is anticipated that the characteristics of the strata underlying the site will prove suitable for the use of infiltration techniques and therefore this is the preferred strategy for the discharge of surface water runoff from the development.
It is proposed to incorporate a variety of SuDS features throughout the development proposals, which will provide ecological and water quality benefits through the dilution, filtration and settlement of solid particles.
Foul Drainage
A new foul water drainage network will be constructed to accommodate the requirements of the proposed development. The new network will collect and convey foul water discharge from the development to the existing public sewer network.