Strategic Flood Risk Assessment - South Worcestershire ...

Estimated Attenuation Storage Volume (m 3 ) 1902.7-2660.6SUDS and the development site:SUDS TypeSource ControlInfiltrationDetentionFiltrationConveyancePotentialSuitabilityCommentsAll forms of source controls are likely to be suitableMapping suggests high permeability at this site, site investigationsshould be carried out to assess potential for drainage by infiltrationMapping suggests that the site slopes are suitable for all forms ofdetentionAll forms of filtration are likely to be suitableAll forms of conveyance are likely to be suitableThis site is located within a flooding hotspot so all efforts should be made tominimise the rate and volume of runoff leaving the site.The site is not located within a groundwater source protection zone.Residential developments should provide at least two independent SUDSfeatures in series to provide a suitable level of water quality treatment.Flood Defences:None.Effects of Climate Change:Increased rainfall intensity. Increased water levels in the Bretforton Brook.Flood Risk Implications for Development:All development should be located within Flood Zone 1, unless appropriate inaccordance with NPPF Technical Guidance.A detailed site-specific flood risk assessment, including hazard mapping, will berequired for any development in Flood Zone 2, or for sites greater than 1ha inFlood Zone 1.Development of the site is proposed to focus on residential uses.Resilience measures will be required if buildings are situated in the flood riskarea.Green infrastructure should be considered within the mitigation measures forsurface water runoff from potential development.Assessment for runoff should include allowance for climate change effects.New or re-development should adopt exemplar source control SUDStechniques to reduce the risk of frequent low impact flooding due to postdevelopmentrunoff.Onsite attenuation schemes would need to be tested against the hydrograph ofthe receiving watercourse to ensure flows are not exacerbated downstreamwithin the catchment.The site falls within an area with low susceptibility to groundwater emergence(