The Environment Agency (EA) Flood Map for Planning demonstrates the site to be located within Flood Zone 1 (areas deemed to possess a very low chance of fluvial flooding). The mapping also demonstrates the site to predominantly possess a very low chance of flooding from surface water (pluvial). This is with the exception of two isolated areas of flood risk adjacent to the site’s northern boundary, which is present for all mapped return periods, alongside a series of low chance overland pathways which follow the declining topography of the site to the south. All development is to be located outside of any areas of established flood risk, and as such the risk of flooding is deemed to be low.

A desktop ground investigation demonstrates the site to be underlain by a mudstone bedrock and as such the use of infiltration drainage devices is deemed to be unfeasible. A tributary of the Sor Brook flows in a westerly direction adjacent to the site’s southern boundary and is an ideal outfall location for surface water runoff produced onsite.

Runoff will be discharged at the existing greenfield runoff rate into the minor watercourse as to mimic existing runoff conditions and ensure that flood risk is not increased elsewhere as a result of the development. The primary attenuation provided onsite will comprise of a series of attenuation ponds. Additional sustainable drainage features are to be incorporated within the development’s drainage design where feasible to enhance the treatment of surface water runoff produced onsite and mitigate against pollution.

The foul drainage strategy is being developed in conjunction with Thames Water and a connection point to the existing foul sewer network will be provided