ODU14:NewtowntoStoke
Overview
ODU14extendsalongthelargelyundevelopedandundefendedfrontagefrom NewtowntoStoke.Thisrelativelylongunitcomprisesmainlyprivate,or HampshireCountyCouncilownedagriculturallandadjacenttothecoast.
Defences
Thisunitismainlyundefended,butwhereadhocembankmentsand revetmentsdoexist,thesehavearesiduallifeoflessthan10years,andin someplaceshasalreadyfailed.Thesedefencesarecurrentlymaintainedby privatelandownersorHampshireCountyCouncil.
Infrastructure
TheHaylingBillyTrailisanimportantpublicfootpathandNationalCycleRoute whichiswidelyused,andwhereclosetotheshorelineisatriskoferosion.The HaylingBillyTrail,alsodesignatedasaLocalNatureReserve,isacknowledged asacriticalpieceofinfrastructureintheDraftHavantBoroughCouncilLocal Planforsustainabletransport.
Environment
TheLangstoneHarbourintertidalareaadjacenttothisfrontageisheavily environmentallydesignatedasaSSSI,Ramsar,SPA,SACandisincludedasan importantSolentWaderandBrentGooseSiteandbirdrefugeintheDraftLocal Plan.
ShorelineManagementPlanPolicy
NoActiveInterventionforthenext100years.
ODU14 cliff erosion
ODU14location
ODU14
Risk
Erosionisthemainrisk,howevertherearepocketsoffloodriskinthecentreandfarnorthofthefrontage.Four propertiesareatfloodriskoverthenext100yearswithoutdefencesinplace,alongwithsmallsectionsofWest Lane,akeyaccessroutetothesouthoftheisland,andtheHaylingBillyTrail.
Themapsbelowshowthemodelledextentanddepthsofanextremetidalfloodevent(1in200year,0.5%annual probability),withoutanydefences,todayandin100years,allowingforsealevelrise.
Erosionrisk
Numberofpropertiesatrisk,withnodefences
Tidalfloodrisk
Numberofpropertiesatrisk,withnodefences
TODAY100YEARS
OverallStrategicOption
Donothing
toallownaturalprocessestocontinuetomakespacefornature. PotentialrollbackoftheHaylingBillyTrailwillneedtobe consideredinareasatrisk,tomaintaintheaccessroutebecause buildingnewdefencestoprotecttheTrailinitscurrentlocationis unlikelytobeconsentablebyregulators.Adaptationwillneedto beexploredforthosefewpropertiesatfloodriskinthelonger term,andlocalisedfloodprotectiontoWestLaneshouldbe considereddependantonriskinthefuture.
NextSteps
Noneidentifiedforthisfrontageintheshort-term,otherthanongoing conversationswithcommunitiesinrelationtolevelsofriskandwhat todointheeventofaflood.