Strategic Flood Risk Assessment - South Worcestershire ...

SUDS and the development site:SUDS TypeSource ControlInfiltrationDetentionFiltrationConveyancePotentialSuitabilityCommentsMost source control techniques are likely to be suitable. Permeablepaving is unlikely to be suitable due to high risk of groundwaterfloodingMapping suggests underlying soil is likely to be permeable.However, the high risk of groundwater flooding would makeinfiltration unsuitableMapping suggests that the site slopes are suitable for all forms ofdetentionFiltration techniques may be suitable if a non-permeable liner isprovided to prevent the ingress of groundwaterAll conveyance techniques are likely to be suitableFlood Defences:NoneThis 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 SUDS features inseries to provide a suitable level of water quality treatment.Effects of Climate Change:Increased rainfall intensity. Increased water levels in the unnamed watercourse.Flood Risk Implications for Development: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 in FloodZone 1.Development of the site is proposed to focus on residential uses.Built development should be located outside of Flood Zone 2. As the site is 100%covered by Flood Zone 2, this site should not be considered as suitable for builtdevelopment.Resilience measures will be required if buildings are situated in the flood risk area.Any development at this site will require a site-specific flood risk assessment.Green infrastructure should be considered within the mitigation measures for surfacewater runoff from potential development.Assessment for runoff should include allowance for climate change effects.New or re-development should adopt exemplar source control SUDS techniques toreduce the risk of frequent low impact flooding due to post-development runoff.Onsite attenuation schemes would need to be tested against the hydrograph of thereceiving watercourse to ensure flows are not exacerbated downstream within thecatchment.The site falls within an area indicated to potentially be susceptible to groundwateremergence. Further assessment of groundwater risk would be required and anassessment of suitable surface water mitigation techniques should be made at thedetailed FRA level.There are currently no access roads to the site. If new access roads are consideredflood risk needs to be investigated further.Demonstration that development at this location can be made safe.2012s5947 S Worcestershire Level 2 SFRA Update FINAL Report v1.0.doc 54