Surface Water Management Plan - Hampshire County Council

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areas: - Rushmoor, Basingstoke and the central Hampshire chalk catchment(groundwater flooding).In addition to this, Eastleigh, ranked just outside of the initial funded SWMPsat no. 102, was also deemed to require a SWMP. This SWMP will initiallyconsider the risk of flooding across the entirety of the borough of Eastleigh toenable better understanding of the flood risk in this area and to assesspotential mitigation options for areas determined to be at a high risk offlooding.The first stage of any SWMP is data collection, involving consultation with keypartners and stakeholders to obtain all relevant data and information relatingto historic and current flooding, alongside information on flood receptors andflood consequences.Following completion of the data collection phase, the surface water floodinginformation is assessed in order to identify ‘hotspot’ areas that have a historyof flooding incidents. These are prioritised for further investigation initially.However, sites considered being at a potential future risk of flooding will alsobe considered and the information used to inform the planning process andthe future location of new development.It should be borne in mind, however, that this is one in a series of intermediateSWMPs planned across the county. Areas identified as a priority in Eastleighwill, in due course, need to be considered alongside priority areas identified infuture SWMPs covering other districts. Similarly, the order in which potentialflood alleviation / mitigation schemes are identified and progressed will beconsidered in this broader context rather than on a district by district basis.Another determinant of which, how and when schemes are progressed will bethe availability of funding to implement such works.Flooding arising from a combination of sources, and flooding incidentsinvolving interaction between different flood types, will fall to the Lead LocalFlood Authority (Hampshire County Council) to investigate, and thereforethese types of flood incident will be considered within the scope of thisSWMP.This report aims to consider all hydraulic flooding incidents in Eastleigh butdoes not address sewer flooding where it occurs as a result of operationalissues as this is the responsibility of the water companies.It should also be noted that the compilation of flooding events within theborough does include some flooding solely due to main rivers, responsibilityfor which falls to the riparian landowner and is under the supervision of theEnvironment Agency. Therefore, further investigation of these occurrences isconsidered to be outside the remit of this report. Coastal flooding is alsobeyond the scope of this report and falls within the remit of the EnvironmentAgency and, by agreement, District, Borough and City councils.2
3. Aims & ObjectivesWithin the overarching SWMP document, a number of generic objectives havebeen developed which should be considered as the basis for any SWMP.These objectives are to: Map historic flood incident data; Map flooding locations influenced by surface water; Identify surface water flooding ‘hotspot’ areas; Assess, compare and prioritise ‘hotspot’ areas for detailedassessment; Identify measures where appropriate, assess options and confirmpreferred mitigation options for identified ‘hotspots’; Engage with partners and stakeholders; and Make recommendations for the next stages of assessment.In addition to these, specific objectives for the Eastleigh SWMP are as follows:To identify and record known drainage assets in high risk areas,including information on condition, ownership and maintenancerequirements; andTo ensure the results of the SWMP link into both developmentplanning and emergency planning policies and procedures.This report will also refer to, and take into account, information andrecommendations made within the following key documents:Partnership for Urban South Hampshire (PUSH) Strategic Flood RiskAssessment produced by Halcrow,Test & Itchen Catchment Flood Management Plan, published by theEnvironment Agency.South East Catchment Flood Management Plan, published by theEnvironment AgencyRiver Basin Management Plan: South East River Basin District;North Solent Shoreline Management Plan, Selsey Bill to Hurst Spit4. The Study Area4.1. GeneralEastleigh Borough lies in the central south of Hampshire and includes thetown of Eastleigh and a number of smaller settlements.The borough covers an area of over 8,000 hectares, containing a mixture ofhighly urbanised settlements with more sparsely populated agricultural landin-between, supporting a population of approximately 116,000 living in around50,000 dwellings.3
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Surface Water Management Plan - Hampshire County Council

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