Strategic Flood Risk Assessment - South Worcestershire ...

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impermeable surfaces may result in an increase of surface water flood risk. TheA440 Swinesheard Way road, Staplow road, the Dinchall road and Kilbury Drive themain access roads, are at risk 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 TypeGreenfield Runoff Rate (l/s/ha)Estimated Attenuation Storage Volume (m 3 ) 2,830 – 3,770SUDS and the development site:SUDS TypePotentialSuitabilityCommentsUnknown – Lower permeability1 in 2 year 7.71 in 100 year (plus climate change) 29.3Source ControlInfiltrationDetentionFiltrationConveyanceAll source control techniques are likely to be suitableMapping suggests underlying soil is unlikely to be permeable. A siteinvestigation should be carried out to assess suitability of drainage byinfiltrationMapping suggests that site slopes may be steep so larger features‘above ground’ may not be viableAll filtration techniques are likely to be suitableAll conveyance techniques are likely to be suitableFlood Defences:NoneThe 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 the Bow 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 in FloodZone 1.Development of the site is proposed to focus on residential uses.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 the2012s5947 S Worcestershire Level 2 SFRA Update FINAL Report v1.0.doc 96
catchment.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 access roads to the site; the A440 Swinesheard Way road, the Staplow road, theDinchall road and the Kilbury Drive are at risk from fluvial and \ or surface waterflooding. Suitable alternative access arrangements away from the floodplain willneed 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 97
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2012s5947 South WorcestershireStrat
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ContractThis Level 2 Strategic Floo
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Executive SummaryThis report is an
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Table 7-16: SWDP8/1 (Broomhall Comm
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NRDOrdinary WatercourseOS NGRPFRAPi
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identify the level of detail requir
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1.4 Approach1.4.1 General Assessmen
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1.5.3 Severn Trent WaterSevern Tren
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2 The Planning Framework and Flood
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Additionally Provision 110 of the A
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Risk ManagementAuthority (RMA)Distr
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3 Understanding Flood Risk in South
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earth embankment, flood wall and fl
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4 How Flood Risk is Assessed4.1 Def
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Zone 1Zone 2Zone 3aZone 3bTable 4-1
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etween the proposed level of commit
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5 Mapping and risk based approach5.
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The ability to manage flood risk fo
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Stage 3 - Applying the Sequential T
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6 Overview of future developmentThe
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A proposed 340 dwelling have been a
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Figure 6-5: Proposed Pershore Alloc
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6.3 Windfall sitesWindfall is unall
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7 Summary assessment of SWDP develo
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SUDS TypeSource ControlsTable 7-2:
Page 54 and 55: 7.4 Summary tables and mapsTable 7-
Page 56 and 57: SUDS and the development site:SUDS
Page 58 and 59: Sources of Flood Risk:Primary flood
Page 60 and 61: Table 7-5: LP1 (Ivy Lane)OS NGR: SP
Page 66 and 67: Table 7-7: 2012SC (Stonebridge Cros
Page 72 and 73: emergence. Further assessment of gr
Page 76 and 77: Table 7-10: SWDP6/NEWJ (Land North
Page 78 and 79: Estimated Attenuation Storage Volum
Page 82 and 83: Table 7-12: SWDP6/6 (Old Northwick
Page 84 and 85: Soil TypeGreenfield Runoff Rate (l/
Page 86 and 87: Sources of Flood Risk:Surface water
Page 88 and 89: Table 7-14: SWDP6/21 (Former Hallow
Page 90 and 91: SUDS and the development siteSUDS T
Page 94 and 95: Table 7-16: SWDP8/1 (Broomhall Comm
Page 96 and 97: Surface water presents a risk to th
Page 98 and 99: Table 7-17: SWDP8/2 (Temple Laugher
Page 100 and 101: A44 Bromyard road, the A4440 Grove
Page 102 and 103: Table 7-18: SWDP8/3 (Land to the re
Page 106 and 107: Table 7-19: SWDP9/2 (Land east of S
Page 108 and 109: impermeable surfaces may result in
Page 110 and 111: Table 7-20: SWDP9/3 (Boxing Club)OS
Page 116 and 117: Table 7-22: SWDP9/7 (Canal Basin Pr
Page 118 and 119: Soil TypeGreenfield Runoff Rate (l/
Page 120 and 121: Sources of Flood Risk:The main sour
Page 122 and 123: Table 7-24: SWDP13/4 (Former playin
Page 124 and 125: Surface Water Drainage:As an indica
Page 126 and 127: Table 7-25: SWDP13/5 (Former Recrea
Page 128 and 129: Surface Water Drainage:As an indica
Page 130 and 131: Table 7-26: SWDP13/9 (Land off Mayf
Page 132 and 133: Greenfield Runoff Rate (l/s/ha)Esti
Page 136 and 137: eceiving watercourse to ensure flow
Page 138 and 139: Sources of Flood Risk:The main sour
Page 140 and 141: Table 7-29: SWDP18/6 Land rear of t
Page 146 and 147: New or re-development should adopt
Page 150 and 151: Table 7-32: SWDP23/26 (Land between
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Sources of Flood Risk:The main sour
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Table 7-34: SWDP24/8 (Site behind H
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SUDS and the development site:SUDS
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Sources of Flood Risk:Primary flood
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Table 7-36: SWDP24/11 (Site behind
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overtopping of an unnamed tributary
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Table 7-37: SWDP24/13 (Land east of
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Estimated Attenuation Storage Volum
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Sources of Flood Risk:Primary flood
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Table 7-39: SWDP25/9 (Land at Park
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access roads to the site are at ris
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Table 7-40: SWDP/VPx (Vale Park ext
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Surface Water Drainage:As an indica
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8 FRA requirements for developers8.
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Figure 8-1: Rationale for flood res
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Local planning bodies should:Promot
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Temporary BarriersTemporary barrier
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flood risk. Development locations s
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9 Recommended policy for management
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10 Outcomes10.1 Summary of work und
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Appendices2012s5947 S Worcestershir
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AFlood Zone mapping2012s5947 S Worc
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BClimate change mapping2012s5947 S
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CHazard mapping2012s5947 S Worceste
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DSurface water flood risk mapping20
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D.2 200 years2012s5947 S Worcesters
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EFloodplain policy mapping2012s5947
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FSummary of risk to all proposed al
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GProperty and critical infrastructu
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Number of environmental sites at ri
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HConsultation and communication2012
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Offices atAtherstoneDoncasterEdinbu
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