Planning Applications
Flooding Report - Summary of Key Points
Page 17 of 20
Summary of Key Points
- The Developer has failed to recognise the serious surface water flooding from the north of parcel 1, caused by the rapid overwhelming of the storm drains in heavy rainfall conditions.
- The Developer’s Flood Risk Assessment has grossly overstated the Greenfield runoff rate and has thus rendered information in that document invalid.
- The raising of the site by 300mm will block the escape of surface water flooding from the north and greatly increase the flood risk to existing properties.
- The application to use the field labelled Cardinal Field, south of the disused railway line as a SANG is totally unsuitable as this field acts as a functional floodplain for a series of watercourses from the south and east. As a result it rapidly floods many times a year to depths up to 1.5m and should be classed as zone 3b.
- The Developer’s site survey has failed to appreciate the topography of the fields in parcel 1 with their raised borders preventing Greenfield runoff.
- As virtually no pre-development water from parcel 1 currently enters the storm drains, the Developer cannot be allowed to put post development water into the storm drains as it would all be a net gain into the system and accelerate flooding of the River Blackwater. This would affect properties from Tongham to Frimley Green in both Guildford and Rushmoor Boroughs.
- The watercourse running south to north alongside FP350 is deep and can flow very fast and would be a source of considerable danger of drowning to children and adults