Strategic Flood Risk Assessment - South Worcestershire ...

Sources of Flood Risk:Primary flood risk to the site is fluvial, resulting from overtopping of the unnamedtributaries of Whiteacres Brook to the north and east of the site. The sitepredominately falls within Flood Zone 3a and the majority of the site falls withinFlood Zone 2 and 3. The majority of the site falls within the Blue Zone of the PolicyMaps. The Mayfield Road and the Elgar Avenue road, the main access roads to thesite, are at risk from fluvial flooding.This site is shown to be partially within one of the County Council’s historic floodhotspots.Surface water presents a risk to the site. Further development and creation ofimpermeable surfaces may result in an increase of surface water flood risk. TheMayfield Road and the Elgar Avenue road, the main access roads to the site, are atrisk from surface water.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 TypeAlluvial Deposits2012s5947 S Worcestershire Level 2 SFRA Update FINAL Report v1.0.doc 123