Strategic Flood Risk Assessment - South Worcestershire ...

Estimated Attenuation Storage Volume (m 3 ) 420 – 600SUDS and the development site:SUDS TypePotentialSuitabilityComments1 in 100 year (plus climate change) 31.1Source ControlInfiltrationDetentionFiltrationConveyanceAll source control techniques are likely to be suitableMapping suggests low permeability at this site and a risk ofgroundwater flooding. A site investigation should be carried out toassess potential for drainage by infiltrationDetention techniques may be suitable if a non-permeable liner isprovided to prevent the ingress of groundwater.Filtration techniques may be suitable if a non-permeable liner isprovided to prevent the ingress of groundwater.All conveyance techniques are likely to be suitableFlood Defences:None.This 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 tributary of Noleham Brook.Flood Risk Implications for Development:Development of the site is proposed to focus on residential uses.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 in FloodZone 1.Resilience measures will be required if buildings are situated in the flood risk area.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.All current access roads to the site, the Chapel Road and the Stratford road, are atrisk from both fluvial and surface water flooding. Suitable alternative accessarrangements away from the floodplain will need 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 57