Australian Capital Territory Rainwater tanks - Canberra Capital Territory Rainwater tanks ... for above or below ground tanks. ... is a rainwater tank on a stand with a simple tap outlet for filling

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Australian Capital TerritoryRainwater tanksGuidelines for residential properties in CanberraReprinted June 2006ContentsForeword 3Commonly asked questions Whyinstallarainwatertank? 3HowcanIuserainwater? 4HowbigatankdoIneed? 4CanIdisconnectfromtheACTEWwatermains? 4Whattypeofrainwatertankisbestforme? 5Howmuchwillitcost? 5Arethereanyfinancialincentives? 5WillIpaylessonmywateraccount? 6WhatworkcanIdowithoutaplumbingorelectricitylicence? 6Arethereapprovalcosts? 6Istankwatersafetodrink? 6ShouldIaddfluoride? 7ShouldIusekerosenetocontrolmosquitoes? 7DoIneedtofiltertankwater? 7Rainwater assembly options Illustrations 8-0Installation requirements Rainwatertankbases Coversandlids Screensandstrainers Firstflushrainwaterdiverter 2Plumbingpipesandfittings 2Lightproofing 2Pumps 22Top-upfacility 3Overflow 3Maintenance and system management Drinking water safety Healthconsiderations 4Disinfection 5Roofmaterials 5Leadflashing 5Paintsandcoatings 5Regulations Planningandbuildingapprovals 6Buildingwithineasementsornearutilityassets 7Plumbingapprovals 7Plumbingrequirements 7Rainwaterplumbingmaterialsandlabelling 8Proximitytootherservices 9Backflowprevention 9-20Contact details 21References 21Appendix A 223ForewordTheACTGovernmentiscommittedtothewiseuseoftheregionswater.Thestrategyforsustainablewaterresourcemanagement,'Think water, act water',providesaclearvisionandarangeofinitiativesforthesustainableuseofwaterresources.ItsetstargetstoreduceCanberra'spercapitamainswaterconsumptionby2percentby203and25percentby2023.OneproposalistopromotetheuseofrainwatertankstohelpreducethepercapitademandontheACTEWwaternetwork.ThisRainwaterTankGuidehasbeenpreparedinpartnershipbetweenActewAGL,EnvironmentACT,theACTPlanningandLandAuthorityandACTHealthandprovidesguidanceontheinstallationofrainwatertanksinresidentialproperties.Commonly asked questionsWhy install a rainwater tank?Rainwatertankscanmakeanimportantcontributiontowardsreducingthedemandourhomesmakeondamstorages.Rainwatertankscanalsohelpslowtheflowofstormwaterfromoururbanenvironmentintolocalcreeksandrivers.Byusingrainwateryoucanalsomakesavingsonyourwateraccount.Theseguidelineshavebeenpreparedtohelpyouunderstandthekeyissuesthatneedtobestudiedwhenplanningasuccessfultankinstallation.Subjectscoveredinclude: howmuchwatertostore, healthandsafety, regulationsand installationrequirements.AlltheessentialrequirementsofActewAGL,ACTHealth,theACTPlanningandLandAuthorityandEnvironmentACThavebeenincludedtomakeyourinvestigationseasier.However,whilethisinformationwascorrectatthetimeofprinting,requirementscanchange.Youareadviseditisyourresponsibilitytoensureyouareawareofuptodatelegislationandregulations.Youshouldcontactrelevantagencieslistedonpage2toensureyouhavethelatestinformation.4How can I use rainwater?Ataponasimplerainwatertankcan: supplyirrigationdrippersorasoakerhose, fillabuckettowashacar, top-upaswimmingpooland fillanornamentalpond.Withadditionalplumbingarainwatertankcansupplywaterto: ahose, irrigationspraysand aflushingtoilet.Withcarefulcontrolofwaterqualityarainwatertankcanalsobeusedto: fillawashingmachine, runshowersandbathsand providesafedrinkingwater.How big a tank do I need?Estimatingthesizeofatankrequiresacombinationofexperienceandcalculation.Rainfallisvariableanddemandwillchangewiththeseasonsandtheneedsoftheresident.Inaddition,thesizeoftherainwatertankwilldependon: howmuchrainfallseachyear, theareaofroofavailabletocapturetherain, howyouplantousetherainwater, thenumberofpeoplelivinginyourhouse, thecurrentwaterusagerateand availablespacetoinstallthetank.Youcanestimateyouryearlywatersavingswiththecalculatoratwww.thinkwater.act.gov.au/calculators/water_calculators.shtmloratAppendixAofthisbook.Theexperienceofyourlocalrainwatertanksupplierwillalsobeinvaluable.Can I disconnect from the ACTEW water mains?Makingyourhomeself-sufficientandindependentfromtheACTEWnetworksupplyrequiresalargecontributingroofareaandsubstantialtankcapacity(probablygreaterthan00,000litresforanaveragehouse).Canberrahasavariablerainfallandissubjecttodrought,sorigorouswatersavinghabitsarerequiredifyouwantyourhouseholdtobeself-sufficient.Eventhenthereisnoguaranteethatyouwouldneverrunoutofwater.5ActewAGLcandisconnectyourmainspressurewatersupplyinaccordancewiththestandardscheduleofprices.Afterdisconnectionyouwillnotbebilledforwaterusagechargesbutyouwillhavetopayanetworkavailabilitycharge,sothereisnofinancialbenefitindisconnecting.Keepingthenetworksupplyforemergenciesortop-upisausefulsafeguard.What type of rainwater tank is best for me?Mostresidentialrainwatertanksaremadefromplastic,fibreglass,concrete,corrugatedgalvanisedsteelorcorrugatedsteellinedwithplastic.Almostanytankmaterialcanbeusedtostorewaterforirrigationortoiletflushing.Tanksusedfordrinking,foodpreparation,washingclothes,showersorbathingshouldbemadefrom,orlinedwith,adrink-safe(foodgrade)material.Yourtankmanufacturercanadviseaboutthebestmaterialandmosteconomicalsolutionforaboveorbelowgroundtanks.How much will it cost?Rainwatertankpricesvaryaccordingtosize,material,finish,strengthandquality.Itisworthcomparingpricesfromseveralsuppliers.Otherinstallationcostswillvaryaccordingtothecomplexityofyoursystembutmayinclude: transportation, alterationtoguttersanddownpipes, tankstandfoundationwork, afirstflushrainwaterdiverter, inletandoverflowpipeinsectscreens, plumbingpipesandfittings, engagingalicensedplumberforhouseholdplumbing, watertop-upfacility, apumptoincreasepressure,andflowratesand associatedelectricalworks.Are there any financial incentives?Financialincentivesintheformofrebatesmaybeavailabletoassistyourpurchaseofarainwatertank.ThedetailsofanycurrentrebateprogramsareavailablefromtheThinkwaterwebsite:www.thinkwater.act.gov.au6Will I pay less on my water account?YoucanexpecttomakesomesavingsonyourActewAGLwateraccountifyouusearainwatertank.However,youmaywishtoestimatewhatthesesavingsarelikelytobebeforeinstallingarainwatersystem.What work can I do without a plumbing or electricity licence?Taking due care, a handy person can install: tanksandstands, irrigationsystemsfromadedicatedtank, apressureboostingpumpusedsolelyforirrigationand rainwaterguttering,downpipesandstormwaterdrains. A licensed plumber must be engaged to install: rainwaterplumbingpipesprovidingwatertothehouse, pressureboostingpumpsforhouseholdrainwaterplumbingand tanktop-upsystems(fedfromthecitywatersupply).ForfurtherdetailseethesectiononRegulations.A licensed electrician must be engaged to modify or install: poweroutletsand fixedwiringtopumpsorelectricalappliances.ForfurtherdetailseethesectiononRegulations.Are there approval costs?Youmaybesubjecttogovernmentchargesforplanning,buildingandplumbingapprovals.Governmentplumbingchargesmaybeincludedinyourplumbersaccount.DetailsareavailableinthefeesandchargesbookletavailableattheACTPlanningandLandAuthorityCustomerServiceCentre.Is tankwater safe to drink?TheuseoftankwaterfordrinkingorfoodpreparationisnotrecommendedwherethereisapotablenetworksupplyavailablewhichmeetstheAustralianDrinkingWaterGuidelines.Ifyouchoosetoinstallarainwatertanktoprovidedrinkingwater,youshouldcontactACTHealthforadviceandfollowthesuggestionsincludedinthesectionon'drinkingwatersafety'.7Should I add fluoride?Rainwaterdoesnotcontainfluoride.Youshouldnotaddfluoridedirectlytotherainwatertank,asitisverydifficulttocontrolthecorrectdosagerate.Talktoyourdentistaboutsubstitutes.Should I use kerosene to control mosquitoes?Lowoxygenlevelsintankwater,causedbyexcessivesludge,willattractmosquitoes.Youmayhaveheardthatateaspoonofkerosenepouredontothesurfaceoftank-waterwillstopmosquitoesfrombreeding.Thisistrue,howeverthereisnoneedtousekeroseneasfineinsectscreensorfinemeshscreensproperlyinstalledoninletandoverflowpointswillpreventmosquitoesenteringthetank.Undernocircumstancesshouldkerosenebeusedifthetankisfordrinkingwater.KerosenemayalsobedamagingtoplasticorAquaplatecoatings.Do I need to filter tankwater?Sedimentandorganicmaterialaccumulatesinrainwatertanks.Afilterontheirrigationsystemcanhelppreventsprinklerheadsfrombecomingcloggedwithsludge.Afiltermaybeinstalledatthekitchensinktoremoveimpuritiesfromdrinkingwater,howevertheunitshouldbemaintainedinaccordancewiththemanufacturersinstructionstopreventthefilterbecomingasourceofcontamination.8Rainwater assembly optionsThefollowingassemblyoptionsillustratesomebasicrainwatertankandplumbingconfigurations.Basic tankThesimplestinstallationisarainwatertankonastandwithasimpletapoutletforfillingajugorbucket.Tap with basic irrigation systemAdedicatedabove-groundtankcanrunasoakerhoseoradrippersystem(bygravity)forthegardenorvegetablepatch.9Pump connected to irrigation system with sprinklersApumpmaybenecessarytoprovidethepressurerequiredforirrigationsprinklersormicro-sprays.Therainwatertankmaybeaboveorbelowtheground.*Tank connected to toilets, washing machines and diswashersToilets,washingmachinesordishwasherscanusetankwater.Apumpisusuallynecessarytoboostpressureandflow.Therainwatertankmaybeaboveorbelowtheground.**Undergroundtankscanbeusedforirrigationsprinklersandhouseholdappliancesbutusuallywillneedapumptoboostpressureandflowrates.0Plumbingconsiderationsincludethefollowing.Washing machine optionsWashingmachinesusuallyhavehotandcoldwaterinlethoses.Thecoldwaterhosecanbeconnectedtoarainwateroutletormovedtothemains-waterifthetankrunsdry.Ifyouchoosetopermanentlyconnectthewashingmachinetoarainwateroutletitmaybenecessarytoinstallamainstop-upvalveatthetanktopreventthetankfromrunningdry.Dishwasher optionsUnder-benchdishwashersareusuallyconnectedtothehotwatersupply.Ifthehotinlethoseisconnectedtoacoldrainwateroutlet,cycletimeswillbelonger.Ifadishwasherispermanentlyconnectedtotherainwateroutlet,youmayrequireamainstop-upvalveatthetanktomakesureitdoesnotrundry.Toilet cistern optionsToiletcisternscanbeconnectedtoadedicatedrainwateroutlet,howeveryoumayneedamainstop-upvalveatthetanktomakesurethetankdoesnotrundry.Itisalsopossibletoconnectacisterntobothmains-waterandtankwateroutlets,providedthecisternhastwocisternvalves(withair-gapbackflowprevention).Toilet cistern assembly showing rainwater and mains-water connectionInstallation requirementsHerearesomeessentialsthatneedtobeaddressedwheninstallingarainwatertank:Rainwater tank basesMostmetalorplastictanksmusthaveastandorbasetocarrythecombinedweightofthetankandwater.Mostflat-bottomedtanksarenotabletocarrytheheavyloadofwaterwithoutthesupportofastrong,levelandcontinuousbase.Whenarainwatertankisfull,everykilolitreofwaterweighs000kilograms(onetonne)soforsafetyitisimportanttoconstructatankstandthatisstrongandstable.Whenarainwatertankisemptyitcanbeblownoverbystrongwinds,somakesureyourtankisadequatelysecuredtothestand.Lightweightstandsshouldbesecurelyfixedtoaheavyfooting.Ifyouareintendingtouseapumptodistributethewater,therainwatertankcanbeatalmostanylevel.Ifyouwishtofeedthewaterbygravityitisusuallynecessarytoelevatetherainwatertankonasturdystand.Topreventexternalcorrosion,theundersideofmetalrainwatertanksshouldbekeptabovethegroundandsitonaself-drainingbase.Undergroundrainwatertanksmustbesealedagainsttheentryofsurfacerun-off,groundwaterandleakingsanitarydrainsthatmaycontainpesticides,fertiliserandanimal(orhuman)faecalmaterial.Undergroundtankswillfloatifsurroundedbywater.Makesuretheholeiswelldrained.Seekengineeringadviceifyouareuncertainaboutfoundationorgroundwaterconditions.Careshouldbetakennottoplacerainwatertanksinsidethedrip-lineofatreecanopy.Rootgrowthcandamagethebaseoftanks.Treesmayfailtothriveifraincannotgettotheroots.Covers and lidsArainwatertankshouldhaveanimperviouscovertopreventtheentryofdust,leaves,pollens,debris,vermin,mosquitoes,birds,animalsandinsects.Itisessentialtosealaccesshatcheswithstrong,close-fitting,childprooflids.Screens and strainersTheinlettotherainwatertankshouldincorporateameshscreenorstrainertopreventtheentryofliveinsectsandtocatchleavesandundesirableroofdeposits.Ameshwithopeningssmallerthanonemillimetreisveryeffectiveagainstmosquitoes.Thetankoverflowshouldalsobeprotectedwithaninsect-proofmesh.2First flush rainwater diverter Foraddedprotectionafirstflushrainwaterdivertercanbeinstalledtodivertthefirstflushofrain(containingroofdust,leaves,droppings,etc.)tothestormwaterandthendirectcleanwaterintotherainwatertank.Fabricated first flush Commercial first flushFirstflushdiversionvalvescanbefabricatedusingplumbingfittingsorpurchasedasacompletecommercialunit.Plumbing pipes and fittingsTankwatertendstobeacidicandcancorrodemetal.Itisadvisable,especiallyinnewinstallations,touserainwater-standardplasticpipesandfittings.SeethesectiononRainwaterplumbingmaterialsandlabelling.Light proofingTanks,covers,plumbingpipesandfittingsshouldbelightprooftominimisedaylightpenetrationandalgalgrowthinthewater.PumpsIftherainwatertankcannotbeelevatedsufficientlytogiveadequatepressuretoappliances,itmaybenecessarytoinstallapressure-boostingpump.Thefloatvalvesintoiletcisterns,irrigationsprinklersandthesolenoidvalvesinwashingmachines(ordishwashers)maynotoperateeffectivelywithoutadequatepressure.Thesizeofpumpwillvaryaccordingtotheheightofthetank,heightoftheappliance,diameterofplumbingpipesandtheflowrequirementsofappliances.Theservicesofahydraulicspecialistand/orpumpsuppliermayberequired.3Top-up facilityIftankwateristhesolesourceofsupplyforselectedtapsorappliances,youmayneedtotop-upthetankfromthedrinkingwaternetworkduringdryperiods.Top-upscanbedonewithahoseorapermanentoverheadfillingtapcomplyingwithACTPlanningandLandAuthorityplumbingregulations.Thetop-upfacilityforrainwatertanksshouldcomplywithAS/NZS3500Part.Whentopping-up,remember: hosesmustnotbeimmersedinthetankwater(seethesectiononbackflowprevention), onlytop-upalittle,perhaps0percent(leavingspacefortherainwhenitcomes)and duringwaterrestrictions,topping-upmaybebannedforsomeirrigationsystemsorrequireanexemptionforotheractivities.OverflowAlthoughitiscommonpracticeinCanberratoconnectroofdownpipesandtankoverflowstothehouseholdstormwaterdrainagesystem,thereisnoregulatoryrequirementtodoso.Itispermissibletospilltheoverflowontotheyard,howeveritisnotpermissibletoletanyofthatstormwaterrunoutsidetheboundariesofyourproperty.Itisalsoillegaltoconnectthetankoverflowtodischargeintotheseweragenetwork.Greatcareshouldbetakennottoletstormwaterpondunderfloorsorfloodaroundthefoundationsofbuildings.Highhumiditycanrottimberfloors,corrodemetalfittingsandpromotethecorrosionofreinforcementinconcreteslabs.Anincreaseinfoundationmoisturecontent,especiallyinclaysoils,cancausecrackinginhousewallsorevenoverturnretainingwalls.4Maintenance and system managementRainwatersystemsneedtobemaintainedregularlytoensurethatthewaterqualityisatitsbestforthepurposeyouintend.Tomaintainyourrainwatertankyoushouldensurethat: allthecomponentsarekeptingoodrepairandfreeofcorrosion, guttersarecleanedregularlytoremoveleaves,debrisandanimaldroppings(gutterguardscanhelpreducethebuild-upofleavesbutrequireregularchecking), rainwaterisnotpondinginroofgutters, therainwatertanksinletandoverflowscreensarecheckedandcleanedregularly, thefirstflushwaterdiverteriscleanedandflushedperiodically, therainwatertankisdesludgedifthebuild-upiscloggingfiltersorcolouringthewater, therainwatertankroofisfreeofcorrosionand theaccesshatchissecure.Drinking water safetyHealth considerationsInurbanareasaccesstoareticulatedpotablewatersupplyremainsthemostsafeandreliablesourceofdrinkingwaterforthecommunity.Theuseofarainwatertankfordrinkingpurposesisnotrecommendedwhereareticulatedsupplyisavailable.Inurbanareasairbornecontaminantsandotherpollutantsmayfindtheirwayintorainwatertanks.Ifyouchoosetouserainwaterfordrinking,foodpreparationorpersonalhygiene,itisimportanttominimisetheriskofcontamination.Pleasetakethefollowingprecautions: screenallopeningstopreventleaves,insects,birds,possums,frogs,faecesandotherforeignmaterialfromgettingintothetank, therooffinish,gutters,down-pipes,tankandplumbingsystemmustbemadedrinkingwatersafeifindoubtgetaclearancefromtheproduct/paintmanufacturer, installafirstflushdevicetodivertthefirstflushofdirtyroofwaterawayfromthetank, flushstagnantmainsorrainwaterfrommainsorrainwaterplumingpipesiftheyhavebeenunusedforalongtime, donotletcontaminatedgroundwaterinfliltrateundergroundwatertanks, checkandmaintainthesystemregularly,and contactACTHealthifyouhaveanyhealthconcerns.5DisinfectionRegulardisinfectionofrainwaterheldindomestictanksisnotconsiderednecessaryinmostcasesandisgenerallyonlyrecommendedasaremedialaction.Asthemicrobiologicalqualityofthewaterattimesmaynotbeasgoodasreticulatedwatersupplies,peoplesuchastheveryyoungorelderly,orimmuno-compromisedshouldconsiderboilingthewaterbeforeconsumptionorforuseinfoodpreparation.Heatingandholdingtherainwateratarollingboilforoneminuteormorewillkillanyharmfulmicroorganisms.ChlorinationiseffectiveagainstharmfulbacteriaandmanyvirusesbuthaslimitedeffectsagainstprotozoasuchasGiardia andCryptosporidium.Itshouldbenotedthattheeffectivenessofchlorineisshortlivedanditwillonlyactonwhatisinthetankatthetimeofdosing.Iftherainwaterissuspectedasbeingapossiblecauseofgastricillness,thentherainwatertankandcatchmentareashouldbeinspectedandappropriateremedialactiontaken.Roof materials Roofsconstructedofcementorterracottatiles,Colorbond,galvanisedsteel,Zincalume,fibrouscement,polycarbonate,fibreglassorslateshouldbesuitableforthecollectionofdrinkingwater.Ifindoubtgetaclearancefromthemanufacturer.Steelcladdingsshouldbefreeofcorrosion.Lead flashing Asaprecautionleadflashingshouldnotbeonthosepartsoftheroofusedasadrinkingwatercatchmentarea.Inthecaseofanexistingroof,leadflashingshouldbereplacedifpossible,althoughitmaybepossibletocoattheflashingwithsuitableroofpaint.Askyourpaintsupplierforadvice.Paints and coatingsBeforepurchasingmaterialorpaintforroofsusedtocollectdrinkingwater,readandobservethemanufacturersrecommendations.6RegulationsThissectionsetsoutACTPlanningandLandAuthorityandActewAGLrequirementsfortheinstallationofrainwatertanks.Planning and building approvalsTheACTPlanningandLandAuthorityrequiresthelocation,sizeandinstallationofrainwatertankstobeappropriatetothestreetscapecharacterandnottoimpactontheamenityofresidents.Iftherainwatertankisforwardofthefrontbuildinglineitisusuallyrequired: tohaveaminimumsetbackfromthefrontboundarynotlessthan50%oftheminimumsetbackapplicabletothatproperty, nottoreduceviewstothestreetfromwindows, nottoreducesolaraccessordaylighttohabitablerooms,and tobescreenedinasensitivemannerwithappropriateshrubberyorwalling.ResidentialsetbacksarepublishedinPlanD2.ofAppendix.(ResidentialDesign&SitingCodeforSingleDwellingintheACT)orAppendix.2(ResidentialDesign&SitingCodeforMulti-DwellingintheACT).Theinstallationofarainwatertankrequiresplanningapproval(andperhapsbuildingapproval)ifitis: infrontoftheresidence, morethan7,000litrescapacity, locatedinaheritagelistedarea, higherthan2.4metresabovenaturalgroundleveland madeofreflective,whiteoroff-whitematerial.Inaddition,ifthetankistobeinstalledwithin3metresoftherearboundaryand/or.5metresofasideboundary,planningapprovalmustbesoughtifthereisanotherclass0structureontheboundary.(Class0structuresincludepoolsandwatertanks.)Fordesignandsitingadviceinaheritagearea,phoneHeritageACTon62079777oremailtoheritage@act.gov.au.TheACTPlanningandLandAuthoritywilltellyouifitisalsonecessarytoobtainbuildingapprovalfromaprivatecertifier.7Building within easements or near utility assetsRainwatertankscannotbeconstructedwithineasementsorwithintheprotectionenveloperequiredforutilityservicesdescribedinRule2ofActewAGLsBuildingoverornearACTEWCorporationwaterandsewerpipesbrochure.PermissibledistancesbetweentanksandoverheadelectricitymainsaresetoutinSection9oftheUtilityNetworks(PublicSafety)Regulations,andvaryfrombetween0.metreto4metres,dependingonthevoltageoftheaerialcableconductor.Thelocationofnaturalgas,stormwaterandcommunicationassetscanbeobtainedbyphoningDial-Before-You-Digon00.Plumbing approvalsTheinstallationofarainwatertankdoesnotrequireplumbingapprovalifthetankis: freestanding, tobeusedonlyforgardenorlawnirrigationand notdeliveringrainwatertotaps,fixturesorappliancesinthehouse.AllotherinstallationsrequireplumbingapprovalandcompliancewithAS/NZS3500Section4Installation of water supply systems from rainwater tanks.Plumbing requirementsBelowisasummaryofAS/NZS3500Section4requirementsforinstallingarainwatertankonaresidentialproperty.) Allplumbedpipingsystemsdeliveringrainwatertotaps,fixturesorappliancesinthehousemustbeinstalledbyalicensedplumberandmeettherequirementsofACTplumbinglegislationandAS/NZS3500.2) AsageneralruletheremustbenodirectconnectionbetweenarainwatertankplumbingsystemandpotablewaterplumbingpipesservedbyActewAGLsreticulateddrinkingwaternetwork(inspecialcasesinterconnectionmaybepermittediftheriskislowandadditionalfailsafeengineeringcontrolsareevaluatedandapprovedbytheACTPlanningandLandAuthorityandActewAGL).3) Whereahigherriskofcontaminationofthewatersupplyisidentifiedtheplumbingregulator,theACTPlanningandLandAuthority,orActewAGLmayrequirethepropertyownertoinstallahigherhazardbackflowpreventiondeviceatthepropertyownerscost.GeneralrequirementscanbefoundlaterinthisbrochureunderBackflowPrevention.4) Rainwaterplumbingworkservinginternaltaps,fixturesorappliances,mustbenotifiedtotheACTPlanningandLandAuthorityusingaStartofWork'noticebeforeworkistocommence.5) Atop-upfacility(drawingwaterfromtheACTEWnetwork)requiresaStartofWork'notice.86) Theplumbermustarrangeforalldrinking-waterandrainwaterplumbingworktobeinspectedbytheACTPlanningandLandAuthority.7) TheplumbermustsubmitaCertificateofCompliancetotheACTPlanningandLandAuthorityandthecustomeratcompletionofthework.Rainwater plumbing materials and labellingPlumbingforarainwatersystemmustuseapprovedmaterialsandbelabelledtodistinguishitfromplumbingusedfor(ACTEW)drinkingwater.AllpipesthatmaybeincontactwithrainwatershouldcomplywithAS/NZS4020.MaterialsusedinplumbingforarainwatertankmustcomplywithAS/NZS3500Water supply Acceptable Solutions- Section 2 Materials and Products.ComplyingproductsaremarkedwiththeAustralianStandardMark5ticks,WforthewatermarkorTfortypetested.AllabovegroundrainwaterservicepipesmustbeclearlymarkedatintervalsnotexceedingmetrewiththecontrastingcolouredwordingRAINWATER.WateroutletsshallbeidentifiedasRAINWATERwithalabelorarainwatertapidentifiedbyagreencolouredindicatorwiththelettersRW.Thispipelabellingcanbeachievedforabovegroundpipesbyusingadhesivepipemarkers(inaccordancewithAS/NZS345).Allbelowgroundrainwaterservicepipesmustbeclearlylabelledrainwatercontinuouslyalongtheirlength,RAINWATERidentificationtapeforbelowgroundpipesshouldbe75millimetreswideandbeinstalledonthetopoftherainwaterpipeline,runninglongitudinallyandfastenedtothepipeatintervalsofnotmorethan3metres.Thiscanbedoneforbelowgroundpipesbyusingidentificationtape(madeinaccordancewithAS/NZS2648). Rainwater labels9EveryrainwatertankoutletmustbelabelledRainwateronapermanentsign.Proximity to other servicesRainwaterpipesmustnotbeinstalledinsidethepipeprotectionenvelopeofanyACTEWwaterorseweragemainorActewAGLelectricitymains.Allabovegroundrainwaterpipesmustbelocated00millimetresfromanydrinkingwaterservice.Allbelowgroundrainwaterpipesmustbelocated300millimetresfromanydrinkingwaterservice.Backflow preventionWherethereisthepotentialforthereverseflowofpollutedwatertocontaminateadrinkingwatersupply,anapprovedbackflowpreventiondevicemustbeinstalled.StandardsAS/NZS3500PlumbingandDrainagePartWaterservicessection4Installation of Water Supply Systems from Rainwater TanksTable4.,setouttheminimumrequirementsfortheinstallationofbackflowpreventiondevicesforzoneprotectionforburied,partlyburiedandabovegroundrainwatertanksinresidentialandcommercialapplications.Tableonpage20suppliesasummaryofbackflowprotectionrequirementsforzoneandcontainmentprotection.20Type of installation Hazard ratingAS/NZS 3500Containment protection at the property boundary(Watermeter)Individual or Zone protection at the tank top upResidentialIntegrated plumbing (externalandinternal)Underground(fullyburiedtank)Medium Testabledevice TestabledeviceorairgapUnderground(partlyburied)Low Non-testabledeviceorWater meter with integral backflow prevention*Non-testabledeviceorairgapAbovegroundtank Low Non-testabledeviceorWater meter with integral backflow prevention*Non-testabledeviceorairgapResidentialExternal rainwater plumbing onlyAboveorbelowgroundExternalhosetapsandirrigationonly.NoconnectiontothenetworkutilityoperatorwatersupplyLow Non-testabledeviceorWater meter with integral backflow prevention*NotapplicableCommercial Application(externalandinternal)AboveorbelowgroundrainwatertanksMedium Testabledevice TestabledeviceTable 1* ActewAGL approved water meters.2Contact detailsACT Planning and Land AuthorityDevelopment(designandsiting)enquiries6ChallisStreet,DicksonTelephone-620793 8.30amto4.30pmweekdaysBuildingandplumbingenquiries6ChallisStreet,DicksonTelephone-6207626 8.30amto4.30pmweekdaysorCnrLysaghtandHoskinsStreets,MitchellTelephone-62076262 8.30amto4.30pmweekdayswww.actpla.act.gov.auEnvironment ACTMacarthurHouse2WattleStreet,LynehamTelephone-62079777 8.30amto5pmweekdayswww.environment.act.gov.auACT Health HealthProtectionServiceTelephone-6205700 8.30amto4.30pmweekdayswww.health.act.gov.auHeritage ACT MacarthurHouse2WattleStreet,LynehamTelephone62079777 8.30amto5.00pmweekdaysEmail:heritage@act.gov.auActewAGL Water Division2HoskinsStreet,MitchellTelephone-62483555 8:30to5:00pmweekdayswww.actewagl.com.auDial-Before-You-DigTelephone008.00amto5.00pmReferencesNationalEnvironmentalHealthForum,Guidance on the use of rainwater tanks.NationalEnvironmentalHealthForumMonographs,WaterseriesNo3998,DavidACunliffe.www.health.nsw.gov.au/public-health/ehd/water/rainwater.html22Appendix A Determining rainwater tank sizeThechartsandtablesinthisappendixwillassistyoutochoosethesizeofrainwatertankbestsuitedtoyourneeds.TheyfactorinCanberrasrainfall,youravailableroofareaandtypicalquantitiesusedforgardenwatering,laundryuseandtoiletflushing.Thefollowingprinciplesapplywhencalculatingthebesttanksizeforyou: Thelargertheroofareaconnectedtothetank,themorewatercollected. Forexample,atankconnectedtoonedownpipeonahousewithfourdownpipes canonlycaptureapproximately25%oftherainthatfallsontheroof.Alldownpipesshouldbeconnectedtogetthemaximumbenefit. Themoreusesmadeofyourtankwater,thegreaterquantityofwateravailableovertime.Forexample,ifyouonlyusetankwateronthegarden,verylittlewillbeusedinthecoldermonths,sothetankislikelytofillandoverflow.Year-roundtoiletflushingorlaunderingreducesthelikelihoodofoverflowlossesandincreasesthetotalamountofwateryouwillcollect. Canberrasrainfallvaries,withlongdroughtperiods,sotheamountofwater collectedwillvaryfromyeartoyear.Evenverylargetankscanrundry.Thecharts(onpages25-27)showtheaverageamountofwaterinkilolitres(kl)youcanexpecttobeabletouseeachyearfromatank.Thiswillvaryfromyeartoyearandhouseholdtohousehold.ThechartsarebasedonwaterconsumptionforanaverageCanberradetachedhouse(showninTable).Table 1. Average Consumption per HouseholdWaterUse Amount(kl/year) %ofTotalUseGardenwatering&otheroutdooruse 4 43%Toiletflushing 60 8%Laundry 43 3%Otherinternaluses(kitchen,shower,bath,etc.) 86 26%Total 330 00%Comparethesefigureswithyourwateraccountsforthelastfewyearstogetabetterideaofyourownwaterconsumption.Thefollowingexamplesshowhowtousethechartstodecidewhatsizetankwillgiveyouthebestreturnonyourinvestment.Ifyouhavedifficultyunderstandingtheseexamples,oryouwanttoexamineotheroptions,pleasetalktoActewAGL,theACTPlanningandLandAuthority,EnvironmentACT,oraskyourlocaltankmanufacturerforadvice.23Example 1Myroofis200squaremetres(sqm)andhasfourdownpipeseachdrainingonequarteroftheroof.WhatsizetankshouldIinstallandhowmuchofmyroofshouldIconnecttothetankforgardenwatering,toiletflushingandawashingmachine?Step.OnChart5-Gardenwatering,toiletflushingandwashingmachine(page27)selecttheverticallineforthedifferentroofareas(forexample,fourdownpipes=200sqm).Markwhereitcrosseseachtanksizecurve.Readtheavailablewaterfromtheverticalaxis.Recordthesenumbersintoatable,forexample,table2below.Table 2. Water Available (from Chart 5)Tanksize(litres)Wateravailablefromtankinkilolitresperyeardownpipe 2downpipes 3downpipes 4downpipesRoofarea:50sqmRoofarea:00sqmRoofarea:50sqmRoofarea:200sqm500 25 4 48 55,000 30 47 57 652,000 30 52 68 795,000 30 59 82 1000,000 30 6 89 020,000 30 6 9 12030,000 30 6 92 2Thetableshowsthatincreasingtheroofareaconnectedtothetanksignificantlyincreasestheamountofwateravailable,particularlyforlargertanks.However,increasingthetanksizemorethan,000litresfor50sqmofroofwillnotyieldanymorewater.Alargertankconnectedtojustonedownpipewouldbeineffective.Forroofareasof00to200sqm,installingatankgreaterthan5,000litreswouldhavelimitedbenefits.Forexample,atankof5,000litresfor200sqmprovides00klperyear.Doublingthetanksizeonlyincreasesthisto0klperyear.Step2.UsingTableworkouttheexpectedannualaveragewaterconsumptionforyourhouseholdforthepurposesofgardenwatering,toiletflushingandlaundry.[Toiletflushingandlaundryarethesimplestinternalusestoconnecttoatank.]Theexpectedconsumptionfortheseusesis244klperyear.Step3.Comparetheexpectedannualconsumptionof244klagainsttheexpectedavailabilityfiguresinTable2.Thendecidehowmuchrainwateryouwanttocollecteachyear.24Forexample,fromthefiguresinTable2,itcanbeseenthat: A,000litretankconnectedtoonedownpipewillprovide30klperyear; A5,000litretankconnectedtotwodownpipeswillprovide59klperyear; A5,000litretankconnectedtothreedownpipeswillprovide82klperyear; A5,000litretankconnectedtofourdownpipeswillprovide00klperyear; A20,000litretankconnectedtofourdownpipeswillprovide20klperyear.Rememberthatissuesofcost,space,appearanceandregulationsalsoneedconsiderationbeforeyouselectyourtanksize.Thecalculationsshowthatthemostyoucancapturefroma200sqmroofisabout50%ofyourexpectedannualconsumptionfortheselecteduses.Anevenlargertank(say50,000litres,oreven00,000litres)willnotcollectmuchmorewater.Example 2Myroofareais50sqm.IwanttoknowwhatsizetankIcouldinstallforarangeofuses.Step.UsingChartsto5,theaveragewateravailablefroma50sqmroofcanbedeterminedfordifferenttanksizesandpurposes.(SeeExampleforinstructions).Recordthesenumbersinatable.(SeeTable3below).Table 3. Summary of water available from a 150 sq m roof for a combination of uses.Wateravailablefromtank(klperyear)Tanksize(litres)ToiletflushingfromChartToilet&laundryfromChart2GardenwateringfromChart3Garden&toiletflushingfromChart4Garden,toiletflushing&laundryfromChart5500 29 36 32 45 49,000 37 45 40 52 582,000 45 57 48 63 685,000 53 70 60 78 820,000 58 79 70 87 8820,000 85 78 90 9030,000 88 85 9 90Thetableshowsmorewaterwillbeavailablegenerallyifthetankwaterisusedregularlyforarangeofpurposes.Thelargertanksarenotasefficientastheyarealreadycapturingmostofthewaterthatcanbecollectedfromaroofof50sqm.Step2.UsingTable,workouttheaveragewaterconsumptionfordifferentpurposes.Recordthesenumbersinatable.(SeeTable4nextpage).25Table 4. Expected demand Expecteddemand(fromTable)inklperyearToiletflushing Toilet&laundryGardenwateringGarden&toilet Garden,toilet&laundry60 (60+43)034 (4+60)20(4+60+43)244Step3.ComparetheexpectedannualconsumptionsinTable4withtheusablewaterinTable3.Noneofthetanksizeswillsatisfyalltheanticipateddemandfroma50sqmroof,butwillstillmakeareasonablecombination.Alargerroofareawillprovidemorerainwater,however,issuesofcostsavings,installationcosts,space,appearanceandregulationswillhavetobeconsideredbeforeyoumakeafinaldecisiononwhichistheoptimumtanksize.Contributing roof area (sq m)Tank usage: toilet flushing26Contributing roof area (sq m)Contributing roof area (sq m)Tank usage: toilet flushing and launderingTank usage: garden watering27Contributing roof area (sq m)Contributing roof area (sq m)Tank usage: garden watering, toilet flushing and launderingTank usage: garden watering and toilet flushing28

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