Derby City Council / Environment Agency | Environmental Statement Our City Our River

 

Black & Veatch   Non technical summary, Page i 

 

NonTechnicalSummary 

   

Derby City Council / Environment Agency |ES Non‐Technical Summary Our City Our River

Black&Veatch 2

Non‐TechnicalSummaryIntroduction

DerbyCityCouncilisapplyingforplanningpermissiontoconstructnewflooddefencesthroughDerbycitycentre.TheprojectiscalledOurCityOurRiver.AnEnvironmentalImpactAssessment(EIA)hasbeencarriedouttounderstandtheeffectsthatthenewflooddefenceswillhaveontheenvironment.TheresultsoftheEIA,includingdetailsofhowtopreventorminimisenegativeenvironmentaleffects,arereportedinanEnvironmentalStatement.ThisNon‐TechnicalSummarysummarisestheimportantfindingsoftheEIA.

Thelocation

Theprojectislocatedalonga9.5kmlongsectionoftheRiverDerwentthroughDerbycitycentre.ThemainprojectareaextendsfromtheA38inthenorthofthecitytotheA5111inthesouth.TheprojectareaalsoincludesthevillagesofAmbastonandShardlow(Figure1).

Figure1 OurCityOurRiverprojectarea

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Derby City Council / Environment Agency |ES Non‐Technical Summary Our City Our River

Black&Veatch 4

Raisingallflooddefencesalongtheirexistinglinewouldforceupriverwaterlevelsbecausedefenceswouldcontainwaterthatwouldotherwisespillintothefloodplain.Thismeanstheheightofflooddefenceswouldbemuchhigherthantheexistingdefences.Forexample,atExeterBridge,defencestoprotectagainstaseverefloodeventwouldneedtobeover2.0metreshigh(fromgroundlevel).ThiswouldgreatlychangewhatDerbycitycentrelookslikeinthefutureandseparatetheriverfromitsfloodplain.

RaisingflooddefencesalongtheirexistinglineinDerbywouldalsoincreasewaterlevelsupstreamasfarastheA38,anddownstreamtowheretheRiverDerwentflowsintotheRiverTrent.Thiswouldincreasefloodrisktopropertiesintheseareas.Itwouldnotbepossibletoraisetheheightofalltheexistingdefencesintheselocationstodealwiththisrisk.

AsaresulttheStrategysetoutaplanforanewlineofflooddefencesthroughDerbythatwillmakemorespaceforfloodwatertomovethroughthecity.ThiswillreducetherequiredheightofdefencesthroughDerbyandminimisethechangeinwaterlevelsinupstreamanddownstreamcommunities.Settingbackflooddefencescanalsocreateabetterriversideenvironmentforpeopleandnature,byopeningupmoregreenspace,restoringthefloodplain,andmakingtheriversidesaferandmoreappealingforresidentsandvisitors.

Thesolution

In2012,DerbyCityCouncilandtheEnvironmentAgencyproducedtheOurCityOurRiverMasterplantosetouthowandwhereflooddefencesshouldbeprovidedtoprotectthecityandimprovethemovementoffloodwaterthroughthecentreofDerby.TheMasterplanalsoidentifiesanumberof‘developmentsites’toaddresstheneedtoredevelopderelictandbrownfieldsitesalongtheriver.Defencesatdevelopmentsiteswillbedeliveredbythirdpartiesaspartoftheredevelopment.ThesedefenceswillconnecttodefencesprovidedbyDerbyCityCouncil,assistedbytheEnvironmentAgency,toprovideacontinuousdefence.

TheMasterplanhasbeendevelopedfurthertocreatetheOurCityOurRiverproject.Theprojecthasbeendividedintoaseriesofdistinctsites,shownonFigure2andFigure3.Improvedfloodprotectionwillbeprovidedbyrealigning,raisingandstrengtheningexistingdefences,andinsomelocationsprovidingnewdefencesaltogether.Thenewdefenceswillbeamixofwallsandembankments,andinsomelocationsnewwatercontrolstructuresandpumpingstationswillbebuilttopreventfloodwaterfrombackingupintothesurfacedrainageandsewagesystems.

TheproposalsaresummarisedinTable1.Inadditiontomeasurestoreducefloodrisk,scourprotectionwillprovidedtothebridgepiers,abutmentsandthechannelbedatStMary’sBridge,DerbyJunctionRailwayBridgeandWilmortonRailwayBridge.Thiswillbepartofongoingmaintenancetoprotecttheseimportantpiecesoftransportinfrastructure.

Thedefenceswillbeconstructedinanumberofstages,broadlysplitintothree‘packages’(refertoFigure2andFigure3).Theprojectisscheduledtobeconstructedbetween2015and2022.Thesequenceofdeliveryofeachstageoftheprojecthasbeendesignedsothatthebenefitsaredeliveredattheearliestopportunityandtoensurethatnoneoftheworksincreasefloodriskinotherpartsofthecity.Someuncertaintysurroundstheplanneddeliveryofthe‘developmentsites’asthesewilldependonplanningconsentbeingreceivedbythethirdpartiesfortheirproposeddevelopments.

Derby City Council / Environment Agency |ES Non‐Technical Summary Our City Our River

Black&Veatch 5

Table1 SummaryoftheOurCityOurRiverproject

Breadsall:New,low,floodwallaroundthe‘BookerWholesale’site.Newdemountabledefencetobeplacedacrossthemidlandsmainlinerailwaywhenneeded.DarleyAbbeyMills:Repairsectionsofexistingflooddefenceandinstallanewwatercontrolstructureonasurfacewaterdraintostopfloodwaterenteringthesewernetwork.DarleyAbbeyMillsBridge:Replaceandraisetheexistingbridgedeck,whichisinpoorcondition,toallowcontinuedaccessacrosstheriver,includingduringfloods.AlfretonRoadIndustrialEstate:Replaceexistingfloodwallswithhigherwallsalongtheexistinglineofdefence.BuildanewfloodgateacrossHaslam’sLane.LittleChester:RaisetheexistingdefencealongeastedgeofDarleyPlayingFieldsbyinstallingafloodwallontopoftheexistingembankment.NewfloodembankmentalongsouthedgeofDarleyPlayingFields.Replaceexistingdefenceswithnew,higher,defencesaroundthecommunitycentreandParker’sPiece.Lowergroundlevelsatthecurrentbowlinggreentohelpfloodconveyance.Providereplacementsportsfacilitiesandcarparking.CityRoadsites:Lowergroundlevelsandprovidenew,setback,defencesatCityRoadcarparkandtheAidaBlissdevelopmentsitetoallowfloodwaterstoflowaroundHandysideBridge.Replaceexistingfloodwallwithanew,higher,set‐backfloodwallatEtruriaGardens.New,set‐backflooddefenceattheLowerCityRoaddevelopmentsite.Replaceexistingfloodwallwithnew,higherfloodwallatBridgeInn.DukeStreet&SowterRoad:Replaceexistingdefencewithnew,higherfloodwallssetbackfromtheriver,includingdemountableflooddefencesacrossDukeStreet.LowergroundlevelsnexttotheriveratthesouthendofDukeStreetandatSowterRoad.ThiswillallowfloodwaterstoflowaroundStMary’sBridgeandCauseyBridgethroughtheSowterRoadunderpass,whichwillbeclosedduringaflood.NorthRiverside&MeadowLane:NewsetbackdefencesthroughNorthRiversidetocreateafloodconveyanceroutearoundExeterBridgeandHolmesBridge;partofregenerationofthearea.Creatingthefloodreliefroutewillrequiresomeexistingbuildingstobedemolished.Newflooddefence,setbackfromtheriver,throughtheMeadowLanedevelopmentsite.FullStreetandExeterBridge:FlooddefencesincorporatedintoredevelopmentoftheformerMagistratesCourtandPoliceStation.FloodgatesacrossDerwentStreettothesouthofExeterBridge.RiversideGardens:RaiseexistingdefencesatRiversideGardensviaasteppedembankment.NewdefencesaspartofthedevelopmentoftheRiverlightsPoolandFitnessCentre.MillFleam:NewpenstocksandpumpingstationattheMillFleamculverttopreventRiverDerwentfloodwatersbackingupMillFleamandcausingsurfacewaterflooding.ChaddesdenSidings:Removetheexistingacousticbarrierandlowergroundlevelstoforma120mwidefloodconveyancecorridor.Newfloodembankmentalongtheedgeofthefloodconveyancecorridor,andanewfloodwallalongthe‘Costco’siteboundary.Plantingandriverfloodplainhabitatcreationalongthefloodconveyancecorridor.ReplacetheexistingDerwentParadeoutfallwithawatercontrolstructureandpumpingstation.ReplacetheexistingChaddesdenBrookoutfallwithwatercontrolstructure.PridePark:Raiselowspotsinexistingdefencesviasectionsoflowfloodwall.ChaddesdenTriangle:Removeexistingfloodembankmentandlowergroundlevelstocreatea45mwidefloodconveyancecorridor.Newflooddefencealongtheedgeofthefloodconveyancecorridor.Raynesway:Raiseexistingdefencesbyraisingtheexistingembankmentonthewestsection,andprovidingafloodwallontopoftheexistingembankmentaroundacricketpitch.AlvastonPark:Provideanewset‐backembankmentaroundthesouthandeastparkboundariestocreatespaceforfloodwaterwhilstprotectingpropertiessouthofAlvastonPark.Ambaston:Raiselowspotsinexistingembankments.Shardlow:Raiselowspotsinexistingembankments.

Derby City Council / Environment Agency |ES Non‐Technical Summary Our City Our River

Black&Veatch 6

Figure2 Locationofproposedflooddefences(upstream)andareasthatwillbenefit

Derby City Council / Environment Agency | ES Non‐Technical Summary Our City Our River 

Black&Veatch 7

Figure3 Locationofproposedflooddefences(downstream)andareasthatwillbenefit

Derby City Council / Environment Agency | ES Non‐Technical Summary Our City Our River

Black&Veatch 8

Consultation

Theconcernsofresidentsandlandownersweretakenintoaccountthroughpublicdrop‐insessionsandonetoonemeetings.

AtDarleyAbbeyMills,theoriginalproposalwastoraisetheexistingflooddefences.ConsultationwithresidentsandEnglishHeritageraisedconcernsaboutthenegativeeffectsofraisingdefences,andthemajorityofpeoplethatwenttoapublicdrop‐insessionwereeithernotinfavourofraisingtheexistingdefencesorwereundecided.Inresponsetothis,analternativeapproachwasagreedtoretaintheheightoftheexistingdefences,carryoutlocalisedmaintenanceworkwhereneeded,andreplacethedeckoftheDarleyAbbeyMillsBridgewhichisinpoorcondition.

AtEtruriaGardens,theoriginaldesignwastoprovideanewsectionoffootpathinfrontofthenewfloodwall,withstepsacrossthefloodwallbetweenEtruriaGardensandtheriversidepath.Sometreeswerealsogoingtoberemovedtoimproveriverviews.Consultationwithresidentsatadrop‐insession,andwithDerbyshireConstabulary,raisedconcernsaboutsafetyandsecurityassociatedwithariversidepath.Residentsalsosaidtheywouldprefertoretainriversidetrees.Inresponsetotheseissues,thedesignwaschangedsothataccessalongthisnarrowstripofriverbankwillnowbepreventedandtreeswillnotberemoved.

PeoplewhowenttothedropinsessionforEtruriaGardenswerealsoaskediftheywouldpreferthenewflooddefencetobea2.0mhighbrickcladwall,ora1.5mhighbrickcladwallwith0.5mhighstructuralglasspanelsontop.Themajorityofpeoplepreferredthesecondoption,whichhasbeenincludedinthedesign.

EtruriaGardens:visualisationofproposeddefencesfollowingpublicconsultation

Derby City Council / Environment Agency | ES Non‐Technical Summary Our City Our River

Black&Veatch 9

Theplanningprocess

Mostsectionsoftheprojectinvolvebuildingnewflooddefencesonadifferentalignmenttotheexistingdefences.TheseworksneedplanningpermissionfromDerbyCityCouncil.However,worktoraiseandstrengthenexistingdefenceswillbecarriedoutusingtheEnvironmentAgency’spermitteddevelopmentrightsanddonotneedplanningapproval.

ProjectsthatarejudgedasbeinglikelytocausesignificanteffectsontheenvironmenthavetogothroughanEnvironmentalImpactAssessment(EIA)tosupporttheplanningapplication.DerbyCityCouncilconfirmedthattheOurCityOurRiverprojectislikelytogiverisetosignificanteffectsontheenvironment,andassuchanEIAhasbeencarriedout.

WorkcarriedoutusingpermitteddevelopmentrightscanalsoneedEIAbeforeworkcanstartifitislikelytocausesignificanteffectsontheenvironment.Assuch,theEIAforOurCityOurRiverconsideredallpartsoftheproject,notjustthosethatneedplanningpermission.

ThefindingsoftheEIAarereportedintheEnvironmentalStatement,whichsupportstheplanningapplicationfortheprojectandalsomeetstheEIArequirementsforpermitteddevelopment.

TheEnvironmentalImpactAssessment

TheEIAforOurCityOurRiverassessedtheeffectsoftheprojectonthefollowingaspectsoftheenvironment:

HumanPopulation WaterandFloodRisk

HistoricEnvironment Ecology

LandscapeCharacter Traffic,TransportandAirQuality

VisualAmenity MaterialsandWaste

SoilandLandContamination CumulativeEffects.TheEIAconsideredtheexistingconditionoftheenvironmentandthewaythismaychangeasaresultofconstructionandoperationoftheproject.Whennegativeeffectswereidentified,waysofpreventingorreducingthescaleoftheeffectswereconsidered.Insomecasesitwaspossibletoalterthedesignoftheprojecttoavoidorminimiseeffects,forexamplethedefencesatLittleChesterhavebeendesignedtominimiseeffectsonarchaeology.Inothercasesactionswillneedtobecarriedoutduringconstruction,forexamplemeasurestoprotectknownbatroosts.AlloftheactionsneededtominimisenegativeeffectsontheenvironmenthavebeensetoutinanEnvironmentalActionPlan.Thiswillbefollowedandupdatedastheprojectprogresses.

ThekeyfindingsoftheEIAaresummarisedinthefollowingsections.

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Derby City Council / Environment Agency | ES Non‐Technical Summary Our City Our River

Black&Veatch 11

HistoricEnvironment

Derbyhasarichhistorywithmanyimportantheritageassetsrangingfromthepre‐historicperiodthroughtothetwentiethcentury.ExtensiveRomanremainsexistatLittleChester,comprisingthenationallyimportantremainsofaformerRomanfortanditsassociatedsettlement.ThemorerecentindustrialheritagealongtheRiverDerwentisevidentasformermillsandreflectedinthestatusoftheDerwentValleyMillsWorldHeritageSite.IntotaltherearefourScheduledMonumentsclosetotheworks,sixConservationAreasandnumerouslocallyandnationallyListedBuildings.

Theprojecthasbeendesignedtominimisepermanentchangestothehistoricenvironment.ThenewbridgedeckatDarleyAbbeyMillswillnotchangethesettingoftheformermillbuildingsoraffecttheviewsfromDarleyAbbeyvillage.ThealignmentofflooddefencesatLittleChesterhasbeendesignedtominimisetheextentofRomanremainsdisturbedbytheworks,andalsotoshowthelocationoftheRomanfortwalls.Wherenecessary,treeswillbeplantedtoscreennewflooddefencestopreventsignificantchangestothesettingofhistoricbuildings.

ThenewdefenceswillreducefloodrisktoheritagefeaturesincludingListedBuildings,ConservationAreas,andtheRomanfortScheduledMonument.However,twolocallyListedBuildingswillneedtobedemolishedatNorthRiverside:ComptonHouseandExeterHouse.

ThesettingofseveralListedBuildingswillbetemporarilyaffectedduringconstruction,andconstructionworkcouldalsodamagenationallyimportantburiedremains.Anarchaeologicalmitigationstrategywillbepreparedandmeasurestoavoidorreduceeffectsarelikelytoincludewatchingbriefs,archaeologicalevaluationtrenchingandprogrammesofstripandrecord.InformationboardswillalsobeerectedtotellpeopleaboutDerby’sheritage.

DarleyAbbeyMills,partoftheDerwentValleyMillsWorldHeritageSite

Derby City Council / Environment Agency | ES Non‐Technical Summary Our City Our River

Black&Veatch 12

LandscapeCharacterandVisualAmenity

Increasingtheheightofexistingflooddefences,andbuildingnewdefences,hasthepotentialtopermanentlychangethelandscapecharacterandvisualamenityofDerbycitycentre.Viewsfromresidentialandcommercialpropertiesandtheattractivenessofpublicspacecouldbeaffected.Thefollowingmeasureshavebeenincludedintheprojecttominimisenegativeeffects:

StructuralglasspanelshavebeenincludedaspartoffloodwallstomaintainviewsfrompropertiesatEtruriaGardens,theBridgeInnbeergardenandcarpark,CityRoadatParker’sPiece,andDukeStreet.

Floodwallsinresidentialandpublicareaswillbecladwithbrickorstonesothattheyblendinwiththeexistingbuiltenvironment.

Replacementtreeswillbeplantedtomaintainthedistinctlandscapecharacterandthevisualamenityoftheriverside.

Grassedembankmentswillbebuiltatthebaseofsomefloodwallstoreducetheintrusivenessofthewalls,forexampleatLittleChester.

Greenwallswillbeusedtoreducetheintrusivenessofsomenewwalls,forexampleatDarwinPlaceinNorthRiverside.

ThereremainspotentialforsignificanteffectsonlandscapecharacterandvisualamenityfrombuildinganewfloodembankmentatAlvastonPark,buildingnewdefencesandthepartiallossofanavenueoftreesatDarleyPlayingFieldsinLittleChester,andlossofviewsforresidentsofStoneHousePrebendlookingoverParker’sPiece.Waysofavoidingorreducingthescaleofnegativeeffectswillbeconsideredaspartofthedetaileddesignprocess.

SoilandLandContamination

PastandpresentindustriallandalongtheRiverDerwentmeansthattherearepotentiallycontaminatedsitesthroughouttheprojectarea.Anassessmentoftheriskofhistoriccontaminationwasundertakenandgroundinvestigationswerecarriedout.Thepotentialforcontaminatedlandtobedisturbedduringconstructionworksorduringfloodingwasexamined.

AlayerofclaywillbeputontopoftheloweredgroundalongthefloodconveyancecorridorsatChaddesdenSidingsandChaddesdenTriangle.Thiswillprovideabarrierbetweenriverwaterandanycontaminantsthatmaybeinthegroundattheseformerindustrialsites.

AtDukeStreet,installingconcreteboredpilescoulddisturbcontaminatedlandandcreatearouteforcontaminantstomoveintocleansoilclosetothesurface.FurthercontaminationassessmentwillbecarriedatDukeStreettobetterunderstandtheextentandlocationofcontamination.Thisinformationwillbeusedtospecifythelocationofboredpilestoavoidcontaminationwherepossible,andtoidentifywherecontaminatedsoilmayneedtoberemoved.

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dtobecleareswillbeplaepossible,wwillbecarrihelossofsmect.

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tareaareustes.Thereisnewpenstoclwillbebuictingtherourethatacc

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mplieswithtutfallsandpiverDerwenqualityandctive.

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nSidingswhetlandspecicreated.Thewillhaveforfishand

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Summary

resetbackfain,butwithattodeveloimprovethe

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Derby City Council / Environment Agency | ES Non‐Technical Summary Our City Our River

Black&Veatch 14

TrafficandTransport

ThecompletedprojectwillreducefloodrisktolargesectionsoftheroadnetworkinDerby.However,duringafloodsomeroutesnexttoandacrosstheriverwillbeclosedwithfloodgatesanddemountableflooddefencestoallowfloodwatertomovedowntheriverinacontrolledway.

ATrafficManagementPlanwillbepreparedandfollowedduringconstructiontominimisedisruptioncausedbyadditionaltrafficandtemporaryclosuresofsomeroadsandcycleroutes.DarleyAbbeyMillsBridgewillbeclosedforoversixmonthstoreplacethebridgedeck.Thiswillcauseasignificantbuttemporaryeffectontheroadandcyclenetworkduetoareductioninthenumberofroutesacrosstheriver.

MaterialsandWaste

Materialsexcavatedduringconstructionwillbereusedwithintheprojectwhereverpossible.Forexample,materialfromloweringgroundlevelsatfloodconveyancerouteswillbereusedinfloodembankmentsorlandscaping,ifitissuitable.Topsoilwillalsobestoredandreused.

Constructingnewearthembankments,andraisingexistingembankments,atLittleChester,ChaddesdenSidings,Raynesway,AlvastonPark,AmbastonandShardlowwillneedlargequantitiesoffillandtopsoil.Theotherkeymaterialsneededaresheetpiles,concrete,aggregatesandfloodwallcladding.Materialswillbesourcedlocallywhereverpossible.

ASiteWasteManagementPlanwillbeusedtoidentifywherematerialcanbereusedwithintheproject,whichmaterialscanberecycled,andsuitablestorageanddisposalmethodsforwastethatcannotbereusedorrecycled.

CumulativeEffects

TheEIAconsideredwhetherchangestotheenvironmentcausedbyOurCityOurRivercouldinteractwithotherprojectstogeneratelarger,moresignificanteffectsthanwouldbecausedbyeachprojectindividually.ProposeddevelopmentsattheformerPoliceStationonFullStreetandattheNorthedgesitewithinAlfretonRoadIndustrialEstatehavepotentialtointeractwiththeeffectsofOurCityOurRivertocausesignificanteffects.

TheproposalsattheformerPoliceStationandatNorthedgehavethepotentialtoresultinadversecumulativeeffectswiththeOurCityOurRiverworksfromtrafficmovementsandthepotentialtodisturbcontaminatedland.TheseriskswillbemanagedthroughtheuseofTrafficManagementPlansonbothprojects,detaileddesigntakingintoaccountcontaminationrisks,andadherencetoconstructionmethodstatements.

Conclusions

OurCityOurRiverhasbeendevelopedinapartnershipbetweenDerbyCityCouncilandtheEnvironmentAgency.Theprojectwillhavethemajorpositiveeffectofreducingfloodriskforapproximately2,100homesandbusinessesandhelpingtoregeneratetherivercorridorthroughDerby.

TheEIAidentifiedanumberofpotentialnegativeeffectsontheenvironmentand,wherepossible,measurestoavoidorminimisetheseeffectshavebeenincludedintotheprojectdesign.MeasurestominimisethescaleofeffectsthatcannotbeavoidedhavebeendevelopedandrecordedinanEnvironmentalActionPlan,whichisincludedwithintheEnvironmentalStatement.