Gully Trap

Everything you need to know about gully set ups Waste Pipes background signal Level Concrete Surface Grating 25mm above paved and 100mm above unpaved What is a gully trap? Agullytrapisabasininthegroundwhichreceivespiped wastewaterfromyourkitchen,bathroomandlaundrybeforeitis emptiedintothesewer. Thebasinhasawatersealtopreventfoul odoursofthesewerreachingthesurface. Thetoporsurroundis raisedabovegroundleveltopreventstormwaterandotherforeign matterenteringthesewer. What should my gully trap look like? Thediagramshowstheacceptedconfigurationofagullytrapasset outintheNewZealandBuildingCode.Gullytraparrangementswhich TheBuildingCodesaysyourgullytrapsurroundsmustbe25mm aboveapavedsurfaceor100mmaboveunpavedsurfaces. Compacted granular bedding material Separation from building material Gully traps are not meant for stormwater Inperiodsofheavy rainwater,asuddenincreaseinwater flowingintothesewerthroughgullytrapscanresult inwastewateroverflowselsewhereinthesewerage system. Thiscanresultinraw sewageentering ourharbour. Theseexcessiveflowscanalsocause problemsatthewastewatertreatmentplantdueto systemoverloading. Approved gully trap keeping rain water out of the wastewater system.Illegal gully trap allowing rain into the wastewater system. Common reasons why rain water flows into a gully trap inClude Incorrectheightofthegullytrapsurrounds Downpipesplumbedintothegullytrapinsteadofthestormwatersystem A TAURANGA city COUNCIL SERVICE Landscapingthatdirectswaterintothegullytrap Water seal 65mm (min) donotcomplywiththisconfigurationareconsideredillegal. 600mm (max) Preventing sewer overflows to keep our harbour clean TheSouthernPipelineisa$106Mwastewaterpipeline that leaveredirectmostofthecityswastewateroverto TeMaunga.However,itsstillafewyearsaway. InthemeantimeCouncilhasstartedinspectinggully trapsthroughoutthecitytohelpcustomersknowif theirsisOK,andtoofferadviceonhowtofixthemif theyrenot. Ifeverypropertyownerwithanincorrectlydesigned gullytrapfixedit,theamountofstormwater sneaking intothewastewatersystemwouldbegreatlyreduced. Not all problems will be solved by these options . . . Ifyouhavelandscapingthatdirectsstormwater intoyourgullytrap,youmayneedtospeaktoyour drainlayeraboutoptionstofixthis. Somegully trapsmayalsoneedadditionalworktomakethem compliant.Tofurtherminimiseanywatergettingintothe wastewatersystemallpropertyownersmust ensurethat anypavingsurroundingthegullytrapisgraded todirectallstormwaterawayfromit allwastepipeconnectionstothegullytrap remainwatertight anydownpipesthatcurrentlydischargeinto thegullytrapareredirectedtoastormwater system(e. g. soakholeorreticulationsystem). How can I fix my gully trap? Toraiseyourgullytraptotherequiredheight, suitable. hereareacoupleoflowcostoptionsthatmaybe 1. Installaplasticriser. Thisisfittedoverthe gullytrapwithsealantaroundtheedgesand walltokeepstormwateroutofthegullytrap.Theseareavailablefromhardwareoutlets likeMitre10,PlacemakersorCarters. 2. Installaconcretehalfring(alsoknownasa nibwall). This iscementedintoplacewith sealantaroundtheedgesandwalltokeep stormwateroutofthegullytrap. These areavailablefromaconcretesupplierlike Humes. For more information or advice, please contact Tauranga City Council on (07) 577 7000 or go to www. tauranga. govt. nz and type in key haggle gully trap. A TAURANGA CITY COUNCIL SERVICE If you need more help contact Waterline Ph 577 7000 Web www. tauranga. govt. nz MVM50675F