Surface Water Management Plan - Hampshire County Council

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13. GlossaryAquiferCatchment FloodManagement Plan(CFMP)Combined SewerSystemCore StrategyCost-BenefitAnalysisCritical DrainageAreaDG5 RegisterDesigning forExceedanceEnvironment AgencyLayer of water-bearing permeable rock, sand orgravel which is capable of providing significantamounts of water.Strategic planning tool through which theEnvironment Agency works with other keydecision-makers within a river catchment toidentify and agree policies for sustainable floodrisk management.Sewer system that carries both sewage and stormwater.A Development Plan Document setting out thespatial vision and strategic objectives of theplanning framework for an area, having regard tothe Community Strategy.Analysis which quantifies in monetary terms thecosts and benefits of a proposed scheme,including items which the market does not providea readily available monetary value for. Sometimesreferred to as Benefit-Cost Analysis.Defined in the Town and Country Planning Act asan area within Flood Zone 1 which has criticaldrainage problems and which has been notified tothe local planning authority by the EnvironmentAgency. Also identified within the Strategic FloodRisk Assessment based on recorded andanecdotal historical flood events.A water company held register of properties whichhave experienced sewer flooding (either internal orexternal flooding) due to hydraulic overload, orproperties which are ‘at risk’ of sewer floodingmore frequently than once in 10 years.Designing for Exceedance is an engineeringphilosophy or approach which aims to plan for andmanage flows which are larger than the designedcapacity of infrastructure during rainfall events. Anexample of deigning for exceedance would be theuse of car parks to store water during flood events.Construction Industry Research and InformationAssociation (CIRIA) have published a designingfor exceedance best practice manual.The Environment Agency is the leading publicbody for protecting and improving the environmentin England and Wales today and for futuregenerations. The organisation is responsible forwide-ranging matters, including the managementof flood risk from main rivers and the coast, water34
EssentialInfrastructureExceedance FlowsFloods DirectiveFlood RiskAssessment (FRA)Flood RiskRegulations 2009(FRR)Flood and WaterManagement Act2010 (FWMA)Flood ZonesFlood Zone 1Flood Zone 2resources, water quality, waste regulation,pollution control, inland fisheries, recreation,conservation and navigation of inland waterways.It will also have a new strategic overview for allforms of flooding.Essential transport infrastructure (including massevacuation routes) which has to cross the area atrisk. Essential utility infrastructure which has to belocated in a flood risk area for critical operationalreasons, including electricity generating powerstations and grid and primary substations; watertreatment plants; and sewage treatment plants ifadequate measures to control pollution andmanage sewage during flooding events are inplace.Excess flow that appears on the surface once thecapacity of the underground drainage system isexceeded.The EU Floods Directive came into force inNovember 2007 and is designed to help MemberStates prevent and limit the impact of floods onpeople, property and the environment. It wastransposed into English law in December 2009 bythe Flood Risk Regulations.An assessment of the likelihood andconsequences of flooding in a development areaso that development needs and mitigationmeasures can be carefully considered.These Regulations transpose Directive2007/60/EC (EU Floods Directive) of the EuropeanParliament and of the Council on the assessmentand management of flood risks for England andWales.Part of the UK Government's response to SirMichael Pitt's Report on the Summer 2007 floods,the aim of which is to clarify the legislativeframework for managing surface water flood risk inEngland.These are a national dataset held by theEnvironment Agency and show the predictedprobability of flooding for any given area. Thezones were created following Defra’s MakingSpace for Water pilot study. This was aGovernment programme that sought to takeforward the developing strategy for flood andcoastal erosion risk management in England.Low probability of flooding – Land considered ashaving less than 1 in 1000 annual probability ofriver or sea flooding in any year (
Page 1 and 2: Eastleigh Surface Water Management
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Page 7 and 8: Hampshire Surface Water Management
Page 9 and 10: 3. Aims & ObjectivesWithin the over
Page 11 and 12: The superficial deposits have been
Page 13 and 14: from ordinary watercourses and also
Page 15 and 16: 6.2. Future / Potential Surface Wat
Page 17 and 18: However, for those sites where the
Page 19 and 20: 7.2.1. AllbrookAllbrook is the smal
Page 21 and 22: The recommendations for Bishopstoke
Page 23 and 24: to provide water storage within the
Page 25 and 26: is also linked to the Southampton I
Page 27 and 28: significant issue. However, given t
Page 29 and 30: consider the interaction of drainag
Page 31 and 32: Figure 3: Location of Sites Recomme
Page 33 and 34: flood risk is not increased downstr
Page 35 and 36: Only measures which score 2 or more
Page 37 and 38: 10. Review & MonitoringIn order for
Page 39: 12. AbbreviationsCFMP Catchment Flo
Page 43 and 44: Multi-Agency FloodPlans (MAFP)Natio
Page 45: UK Climate ImpactsProgramme (UKCIP)

Surface Water Management Plan - Hampshire County Council

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