Strategic Flood Risk Assessment - Wiltshire Council

Wiltshire CouncilSFRA High Level Executive SummaryTable 8-1: Summary of SuDS techniques and their suitability to meet the three aims for sustainability (see Section 9.2)ManagementTrainRegionalSiteSourcePreventionComponent Description Water Quantity Water QualityGreen roofsRainwater harvestingPermeablepavementsFilter drainsInfiltration trenchesKey: ● – highly suitable, ○ - suitable depending on design, - not suitableAmenityBiodiversityLayer of vegetation or gravel on roof areas providingabsorption and storage. ● ● ●Capturing and reusing rainwater for domestic orirrigation uses. ● ○ ○Infiltration through the surface into underlying layer. ● ● ○Drain filled with permeable material with aperforated pipe along the base. ● ● Similar to filter drains but allows infiltration throughsides and base. ● ● Soakaways Underground structure used for store and infiltration. ● ● Bio-retention areasSwalesSand filtersBasinsPondsWetlandVegetated areas used for treating runoff prior todischarge into receiving water or infiltration ● ● ●Grassed depressions, provides temporary storage,conveyance, treatment and possibly infiltration. ● ● ○Provides treatment by filtering runoff through a filtermedia consisting of sand. ● ● Dry depressions outside of storm periods, providestemporary attenuation, treatment and possiblyinfiltration.Designed to accommodate water at all times,provides attenuation, treatment and enhances siteamenity value.● ● ○● ● ●Similar to ponds, but are designed to providecontinuous flow through vegetation. ● ● ●23 June 2009