Strategic Flood Risk Assessment - South Worcestershire ...

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NRDOrdinary WatercourseOS NGRPFRAPitt ReviewPPGPPS25ReFHResilience MeasuresResistance MeasuresRiskReturn PeriodSABSewer floodingSHLAASFRAStakeholderSPRHOSTSUDSSurface water floodingSWMPWCCWDCWFDNational Receptor Dataset – a collection of risk receptors produced by theEnvironment AgencyAll watercourses that are not designated Main River. Local Authorities or, wherethey exist, IDBs have similar permissive powers as the Environment Agency inrelation to flood defence work. However, the riparian owner has the responsibilityof maintenance.Ordnance Survey National Grid ReferencePreliminary Flood Risk AssessmentComprehensive independent review of the 2007 summer floods by Sir Michael Pitt,which provided recommendations to improve flood risk management in England.Planning Policy Guidance – superseded by the NPPFPlanning and Policy Statement 25: Development and Flood RiskRevitalised Flood HydrographMeasures designed to reduce the impact of water that enters property andbusinesses; could include measures such as raising electrical appliances.Measures designed to keep flood water out of properties and businesses; couldinclude flood guards for example.In flood risk management, risk is defined as a product of the probability or likelihoodof a flood occurring, and the consequence of the flood.Is an estimate of the interval of time between events of a certain intensity or size, inthis instance it refers to flood events. It is a statistical measurement denoting theaverage recurrence interval over an extended period of time.SUDS Approval Body - responsible for approving, adopting and maintainingdrainage plans and SUDS schemes that meet the National StandardsFlooding caused by a blockage or overflowing in a sewer or urban drainagesystem.Strategic Housing Land Availability Assessment - The Strategic Housing LandAvailability Assessment (SHLAA) is a technical piece of evidence to support theSWDP and Sites & Policies Development Plan Documents (DPDs). Its purpose isto demonstrate that there is a supply of housing land in the District which is suitableand deliverable.Strategic Flood Risk AssessmentA person or organisation affected by the problem or solution, or interested in theproblem or solution. They can be individuals or organisations, includes the publicand communities.Standard Percentage Runoff (%) associated with each HOST soil classSustainable Drainage Systems - Methods of management practices and controlstructures that are designed to drain surface water in a more sustainable mannerthan some conventional techniquesFlooding as a result of surface water runoff as a result of high intensity rainfall whenwater is ponding or flowing over the ground surface before it enters theunderground drainage network or watercourse, or cannot enter it because thenetwork is full to capacity, thus causing what is known as pluvial flooding.Surface Water Management Plan - The SWMP plan should outline the preferredsurface water management strategy and identify the actions, timescales andresponsibilities of each partner. It is the principal output from the SWMP study.Worcester City CouncilWychavon District CouncilWater Framework Directive2012s5947 S Worcestershire Level 2 SFRA Update FINAL Report v1.0.doc 4
1 Introduction1.1 About this reportThis South Worcestershire Level 2 Strategic Flood Risk Assessment (SFRA) Update reportupdates the document "South Worcestershire Joint Core Strategy Level 1 and Level 2 StrategicFlood Risk Assessment, November 2009". This update report has been prepared to update thework that was included in the previous SFRA and provide appropriate supporting evidence forthe South Worcestershire Development Plan.Since the previous SFRA, there have been a number of changes to the planning systemincluding the Localism Act (2011) and the National Planning Policy Framework (2012) withaccompanying Technical Guidance.The Localism Act and the proposed revocation of the Regional Spatial Strategies provided theopportunity for the three Councils to closely re-examine the local evidence base and establishtheir own local development requirements for employment, housing and other land uses throughthe plan making process. As such, although there has been no change with the overalldevelopment strategy, there have been a number of changes to the proposed allocation sites,with some sites removed, additional sites included and modifications to some sites, andtherefore an update to the SFRA is required to provide supporting evidence for these changes.In addition the provisions of the Flood and Water Management Act (2010) have beensubstantially commenced under a programme that was initiated by Defra in April 2010 and theFlood Risk Regulations came into force in December 2009 (these regulations transposed the EU‘Floods Directive’ into UK law).This Level 2 SFRA update willprovide information on the changes to planning, policy and guidance since the previousSFRA;provide a detailed assessment of the flood hazard within the flood zone;provide information on existing defences and flood risk management measures;allow a sequential approach to site allocation to be undertaken within a flood zone; andallow development of the policies and practices required to ensure that development inFlood Zones 2 and 3 satisfies the requirements of the Exception Test.This document has been prepared under the requirements of the National Planning PolicyFramework (NPPF) and accompanying Technical Guidance to the National Planning PolicyFramework published in March 2012.The extent of the study area, including the principal watercourses, is shown in Figure 1-1.1.2 SFRA objectivesThe SFRA update will form an integral part of the Councils' evidence base in terms of identifyinglocations for development and preparation of flood risk policies in the South WorcestershireDevelopment Plan (SWDP). The primary objective of the SFRA update is to be part of theevidence base supporting the SWDP to inform proposed employment and housing allocations sothey are in accordance with the NPPF 1 . The SWDP supersedes the South Worcestershire JointCore Strategy. In order to achieve this, the NPPF states that SFRAs need to provide sufficientdetail on all types of flood risk to enable to LPA toapply the Sequential and, where necessary, Exception tests in determining land useallocations;refine information on the areas that may flood, taking into account other sources offlooding and the impacts of climate change;inform the Sustainability Appraisal of local development documents;prepare appropriate policies for flood risk management for these areas;1 National Planning Policy Framework (Department for Communities and Local Government, March 2012)2012s5947 S Worcestershire Level 2 SFRA Update FINAL Report v1.0.doc 5
Page 1 and 2: 2012s5947 South WorcestershireStrat
Page 4 and 5: ContractThis Level 2 Strategic Floo
Page 6: Executive SummaryThis report is an
Page 10 and 11: Table 7-16: SWDP8/1 (Broomhall Comm
Page 14 and 15: identify the level of detail requir
Page 16 and 17: 1.4 Approach1.4.1 General Assessmen
Page 18 and 19: 1.5.3 Severn Trent WaterSevern Tren
Page 20 and 21: 2 The Planning Framework and Flood
Page 22 and 23: Additionally Provision 110 of the A
Page 24 and 25: Risk ManagementAuthority (RMA)Distr
Page 26 and 27: 3 Understanding Flood Risk in South
Page 28 and 29: earth embankment, flood wall and fl
Page 30 and 31: 4 How Flood Risk is Assessed4.1 Def
Page 32 and 33: Zone 1Zone 2Zone 3aZone 3bTable 4-1
Page 34 and 35: etween the proposed level of commit
Page 36 and 37: 5 Mapping and risk based approach5.
Page 38 and 39: The ability to manage flood risk fo
Page 40 and 41: Stage 3 - Applying the Sequential T
Page 42 and 43: 6 Overview of future developmentThe
Page 44 and 45: A proposed 340 dwelling have been a
Page 46 and 47: Figure 6-5: Proposed Pershore Alloc
Page 48 and 49: 6.3 Windfall sitesWindfall is unall
Page 50 and 51: 7 Summary assessment of SWDP develo
Page 52 and 53: 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
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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 7-7: 2012SC (Stonebridge Cros
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emergence. Further assessment of gr
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Table 7-10: SWDP6/NEWJ (Land North
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Estimated Attenuation Storage Volum
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Table 7-12: SWDP6/6 (Old Northwick
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Soil TypeGreenfield Runoff Rate (l/
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Sources of Flood Risk:Surface water
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Table 7-14: SWDP6/21 (Former Hallow
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SUDS and the development siteSUDS T
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Table 7-16: SWDP8/1 (Broomhall Comm
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Surface water presents a risk to th
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Table 7-17: SWDP8/2 (Temple Laugher
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A44 Bromyard road, the A4440 Grove
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Table 7-18: SWDP8/3 (Land to the re
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impermeable surfaces may result in
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Table 7-19: SWDP9/2 (Land east of S
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impermeable surfaces may result in
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Table 7-20: SWDP9/3 (Boxing Club)OS
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Table 7-22: SWDP9/7 (Canal Basin Pr
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Soil TypeGreenfield Runoff Rate (l/
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Sources of Flood Risk:The main sour
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Table 7-24: SWDP13/4 (Former playin
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Surface Water Drainage:As an indica
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Table 7-25: SWDP13/5 (Former Recrea
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Table 7-26: SWDP13/9 (Land off Mayf
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Greenfield Runoff Rate (l/s/ha)Esti
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eceiving watercourse to ensure flow
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Table 7-29: SWDP18/6 Land rear of t
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New or re-development should adopt
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Table 7-32: SWDP23/26 (Land between
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Table 7-34: SWDP24/8 (Site behind H
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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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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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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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