Strategic Flood Risk Assessment - South Worcestershire ...

Sources of Flood Risk:The main source of flood risk to the site is from surface water. Surface water isshown to cover parts of the main access roads to the site including the A4184 AbbeyRoad and the minor roads of Abbey Lane and Boat Lane.The western edge of the site falls within Flood Zone 2 and Flood Zone 3b. Primaryfluvial risk is to the western edge of the site resulting from overtopping of the RiverAvon. The western edge of the site is located in the Blue Zone of the Policy Maps.Sections of the A4184 Abbey Road and Boat Lane, some of the main access roadsto the site, fall within Flood Zone 3.Surface Water Drainage:As an indication of requirements to manage surface water runoff at the development site anassessment of the soil types, greenfield runoff rate and attenuation storage volume is includedbelow. Storage volumes displayed are calculated with an assumption that 75% of the site will bedeveloped impermeable ground. A 25% increase in rainfall depths has been included torepresent predicted future climate change effects.PLEASE NOTE: This assessment has been carried out using broad-scale datasets and aims toprovide an indication of the likely opportunities and constraints for this development site. Adetailed drainage assessment based on site-specific conditions should be carried out by asuitably qualified professional and submitted with any planning application. The values belowshould not be used for design purposes.Soil TypeGreenfield Runoff Rate (l/s/ha)Fluvial DepositsEstimated Attenuation Storage Volume (m 3 ) 3,536 – 4,898.41 in 2 year 101 in 100 year (plus climate change) 39.42012s5947 S Worcestershire Level 2 SFRA Update FINAL Report v1.0.doc 47