ODU4:ChichesterRoadtoMillRytheJuniorSchool
Overview
ODU4extendsfromtheNorthneyFarmboundaryatChichesterRoadsouthto MillRytheJuniorschool.Thisfrontagecomprisesamixofagriculturalland, interspersedwithsmallnumbersofresidentialproperties,aholidaycaravan parkandaworkingmarina.Twoareasofformercoastallandfillarealso locatedhere.
Defences
Someofthefrontageisundefended,butwheredefencesexist,theyareadhoc embankmentsandquaywalls,privatelyowned.Defencesaremaintained privatelyorbytheEnvironmentAgency.Residuallivesareshort,typically between10and15years,withsomelocallylessthan10yearsandsoare susceptibletofailureintheshortterm.
Environment
ThefrontagehassignificantenvironmentaldesignationsintheHarbour, including,SSSI,Ramsar,SPAandSAC.Onland,VernerCommonis designatedSSSI,RamsarandSPAandGutnerPointLocalNatureReserve, locatedinthesoutheastofthefrontage,isdesignatedasSSSI,Ramsar,SPA andSAC.SectionsofthisunitalsofallwithintheChichesterHarbour NationalLandscape.Thisfrontageincludeslandthatisimportantforbirds, havinganumberofcoreandprimarysupportareasidentifiedintheSolent WadersandBrentGooseStrategy.
ShorelineManagementPlanPolicy
HoldtheLine,butnopublicfundingavailableforprivatedefencesforthe next100years.Duetothesmallnumberofpropertiesatriskhere,thereis unlikelytobeanycentralfundingavailabletoprogressthispolicyintothe future.
ODU4location
Saltmarshes
Risk
Themainriskalongthisfrontageisfromtidalflooding,wherethereisacontinuousfloodcellalongthecoast.Land, however,risesquitequicklyinland,sofloodriskisrelativelylownow,butwillincreaseinthefuture,especiallyat VernerCommon.
Themapsbelowshowthemodelledextentanddepthsofanextremetidalfloodevent(1in200year,0.5%annual probability),withoutanydefences,todayandin100years,allowingforsealevelrise.
Erosionrisk
Numberofpropertiesatrisk,withnodefences
Tidalfloodrisk
Numberofpropertiesatrisk,withnodefences
StrategicIntent
Thestrategicintentforthisunitisadaptationofassetstobecome moreresilienttoandadjusttoclimatechangeimpactsinthe futureasfloodriskislow.Iflandownerswishtomaintain/replace (andfund)theirdefencestoreducerisktoexistingresidentialand commercialpropertiesinthefuturebutalsopreventformer landfillfromeroding/leachingintotheHarbour,theywillneedto obtaintherelevantlicencesandconsentsfirst.Itisworthnoting thatthestrategicintentdeviatesawayfromtheSMPpolicytoHold theLinefor100years.
NextSteps
Noneidentifiedforthisfrontageintheshort-term,otherthan ongoingconversationswithcommunitiesinrelationtolevels ofriskandwhattodointheeventofaflood.