Level 2 Strategic Flood Risk Assessment (.pdf ... - Wigan Council

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Map Name Map Reference Map Title DescriptionDevelopment Management officerSet A - Flood Zones 2009s0578 - D001_010a FLOOD ZONEMAPEnvironment Agency / other defences held in NFCDD (National Flood andCoastal Defence Database). The flood extents shown represent the risk of flood ifthese defences were not maintained to 5% AEP or greater. In the absence of flooddefences, sites covered by this extent would be designated as Flood Zone 3b.Set B - Flood Zone 3Depth Map2009s0578 - D002_001FLOOD DEPTHMAPDigital Terrain Model (DTM) of Flood Zone 3 in Wigan Borough and location ofpotential development sitesThis will show likely depths of Flooding within Flood Zone 3 - at presents the DTMshows land height above sea level and therefore we are assuming low areas of landwithin Flood Zone 3 are more likely to flood than those areas of land that are higher. Italso displays proposed development sites within the borough. A strategic depth gridhas been created using the extent of Flood Zone 3 and topographic data. These mapsenable identification of variation in flood risk throughout the Flood Zone.Set B - Flood Zone 3Depth Map2009s0578 - D002_002FLOOD DEPTHMAPDigital Terrain Model (DTM) of Flood Zone 3 in Wigan BoroughThis will show likely depths of Flooding within Flood Zone 3 - at presents the DTMshows land height above sea level and therefore we are assuming low areas of landwithin Flood Zone 3 are more likely to flood than those areas of land that are higher. Astrategic depth grid has been created using the extent of Flood Zone 3 andtopographic data. These maps enable identification of variation in flood riskthroughout the Flood Zone.Set B - Flood Zone 3Depth Map2009s0578 - D002a_001FLOOD DEPTHMAPDepth of flooding in Flood Zone 3 in Wigan Borough using JFLOW + modellingand location of potential development sitesThis map provides an indication of the depths of flooding within Flood Zone 3 obtainedfrom JFLOW+ modelling outputs undertaken by JBA Consulting in 2010 for the WiganBorough Council Level 2 SFRA. It also displays proposed development sites withinthe borough. A strategic depth grid has been created using the extent of Flood Zone 32009s0578 Final SFRA with Environment Agency Comments - L2 Ver5 Wigan.docVII
Map Name Map Reference Map Title Descriptionand topographic data. These maps enable identification of variation in flood riskthroughout the Flood ZoneSet B - Flood Zone 3Depth Map2009s0578 - D002a_002FLOOD DEPTHMAPDepth of flooding in Flood Zone 3 in Wigan Borough using JFLOW + modellingThis map provides an indication of the depths of flooding within Flood Zone 3 obtainedfrom JFLOW+ modelling outputs undertaken by JBA Consulting in 2010 for the WiganBorough Council Level 2 SFRA. A strategic depth grid has been created using theextent of Flood Zone 3 and topographic data. These maps enable identification ofvariation in flood risk throughout the Flood Zone.Set C – FloodHazard Map2009s0578 - D003_001FLOODHAZARD MAPDigital Terrain Model (DTM) of Hazard rating within Flood Zone 3 in WiganBoroughThe map displays the hazard rating within Flood Zone 3 using a DTM to assess areasat highest risk compared to areas at lowest risk in Flood Zone 3. The analysis is basedon lower DTM measurements being areas at higher risk.Set C – FloodHazard Map2009s0578 - D003a_001FLOODHAZARD MAPFlood Hazards in Wigan Borough during 1% AEP storm event using JFLOW +modellingThis map provides an indication of strategic flood hazards during a 1% AEP stormevent. The hazard grid was obtained from JFLOW+ modelling outputs undertaken byJBA Consulting in 2010 for the Wigan Borough Council Level 2 SFRA.Set D - Flood RiskManagementMeasures2009s0578 - D004_001FLOOD RISKMANAGEMENTMEASURESFlood risk management measures in Wigan BoroughFlood risk management measures, including the location of Environment Agency,Local Authority and privately owned defence assets. It also indicates the EnvironmentAgency Flood Warning Areas. These maps provide the location of current Flood RiskManagement (FRM) measures within the area including defences and areas benefitingfrom defences (1% standard of protection). This map can be used to identifycommunities that are currently protected to some level.Set E - AreasVulnerable to2009s0578 - D005_001SURFACEWATER MAPSSurface water maps in Wigan BoroughEnvironment Agency Surface Water Mapping at borough level. These maps have2009s0578 Final SFRA with Environment Agency Comments - L2 Ver5 Wigan.docVIII
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Wigan Borough Hybrid SFRAVolume I:
Page 3 and 4:
JBA OfficeJBA ConsultingSouth BarnB
Page 5 and 6:
AcknowledgmentsJBA would like to ac
Page 7 and 8: Understanding flood risk from a pla
Page 9 and 10: 8.3 Planning considerations........
Page 11 and 12: AbbreviationsABDAreas Benefiting fr
Page 13 and 14: The key objectives of a SFRA are to
Page 15 and 16: 2 Flooding from RiversA detailed as
Page 17 and 18: 1. Astely Brook2. Bedford Brook3. W
Page 19 and 20: Unique ID Watercourse Description L
Page 21 and 22: 2.7 Understanding flood risk from a
Page 23 and 24: For example, flooding may affect ke
Page 25 and 26: 3 Flooding from CanalsThe SFRA has
Page 27 and 28: 3.2.2 Canal breach methodologyCanal
Page 29 and 30: 4 Flooding from ReservoirsFollowing
Page 31 and 32: direction in Future Water3, Making
Page 33 and 34: oundaries. Nine key CDAs have been
Page 35 and 36: CDA Sites Site TypeLark Hill, Astle
Page 37 and 38: particular hotspots where surface w
Page 39 and 40: important role to play in reducing
Page 41 and 42: In the reverse situation, where flo
Page 43 and 44: 8 Summary of riskA summary of flood
Page 45 and 46: Having followed this procedure it i
Page 47 and 48: 9 Outline Mitigation OptionsChapter
Page 49 and 50: Water-resistant materials for floor
Page 51 and 52: JBA Consulting - Engineers Scientis
Page 53 and 54: JBA Consulting - Engineers Scientis
Page 55 and 56: Table B-1: Flood Risk Balance Sheet
Page 57: Map Name Map Reference Map Title De
Page 61 and 62: Map Name Map Reference Map Title De
Page 81 and 82: D . Wigan Council - Data RegisterXX
Page 83 and 84: E . SUDs SuitabilityNew SiteReferen
Page 85 and 86: New SiteReferenceWig 354Site Addres
Page 87 and 88: New SiteReferenceWig 855Wig 857Wig
Page 91 and 92: New SiteReferenceWig 716Wig 706BSit
Page 97 and 98: Site Reference Site Location Soil T
Page 99 and 100: F . Flood Zone 3 Proposed Developme
Page 101 and 102: G . Environment Agency comments on
Page 103 and 104: Flood Hazard MappingThe Level 2 rep
Page 105 and 106: Planning LiaisonEnvironment Agency
Page 107 and 108: Guide makes further summation diffi
Page 109 and 110:
Wigan Metropolitan Borough CouncilC
Page 111 and 112:
of the extent of any works required
Page 113 and 114:
Planning & Transport StrategyWigan
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Again, avoiding generalities, we ha
Page 117 and 118:
EA comment:Guidance on the preparat
Page 119 and 120:
Please give me a call to discuss wh
Page 121 and 122:
RECORD OF MEETINGStatus:JBA Project
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