The4thInternationalConferenceonUtilityManagement&Safety(ICUMAS)Summit

NetworkAssetManagementandRenewalIntroductionReplacementandRehabilitationProgrammeofWaterMainsFour-pillarapproachtoNetworkAssetManagementConclusionContentsKeyFactsofWaterSuppliesinHongKong7millionpopulationserved7,800kmFW/SWwatermains293,000valvesTotalarea1,104sqkm(<25%developed)IMPOUNDINGRESERVOIRTREATMENTWORKSPRIMARYSERVICERESERVOIRPUMPINGSTATIONSERVICERESERVOIRCATCHWATERRAWWATERFROMGUANGDONGCUSTOMERSCUSTOMERSPUMPINGSTATIONSERVICERESERVOIRTOCUSTOMERSATypicalFreshWaterSupplySystemPUMPINGSTATIONSERVICERESERVOIRTOSUPPLYTOSUPPLYTOSUPPLYTOSUPPLYWATERMAINWATERMAINNON-RETURNVALVESEAWALLSEALEVELINTAKECULVERTATypicalSaltWaterSupplySystemTheNeedforUndergroundAssetManagementImproveNetworkConditionReducefailurerateImprovenetworkmanagementefficiencyAvoidnuisancetopublicReplacementandRehabilitation(R&R)ProgrammeofWaterMainsUndergroundAssetManagementStudy(UAMS)in19983,000kmofwatermainsoutofthethentotal5,600kmselectedforR&R15-yearprogrammeCommencedin2000.Targetcompletionin2015EstimatedcostHK$23.6billion(MOD)Rank3Rank2Rank1Rank4Rank3Rank2Rank5Rank4Rank3ConsequenceoffailureProbabilityoffailureHighHighMediumMediumLowLowRisk-basedPrioritisationApproachProbabilityoffailureConsequenceoffailurePipematerialNumberofconsumersservedAgeEssentialconsumersFailurerecordImpacttotrafficSurroundingconditionImpacttoadjacentfeaturesConsiderationsonRiskofFailureStage/PhaseLength(km)CommencementCompletionProgress

(asatSep2014)Stage1Phase1350Dec2000Dec2008100%Stage1Phase2250Sep2005Mar2010100%Stage2750Jan2007Jun2011100%Stage3800Sep2008Jun201580%Stage4Phase1500Mar2011Dec201581%Stage4Phase2350Jan2012Dec201549%Total3,000--86%ProgressofR&RProgramme257burstsin2013(132FW/125SW)11,000leaksin2013(8,700FW/2,300SW)22,428in20002,538in2000139burstsin2014(uptoendOct)(76FW/63SW)7,670leaksin2014(uptoendOct)(6,100FW/1,570SW)24.6%in200017%in2013CostTrafficDisruptionThePost-R&REraWaterNetworkManagementStrategy(4)PipelineandAssetManagementStrategicReductionofWaterLoss(1)ActiveLeakageControl(3)SpeedandQualityofRepair(2)PressureManagementSmartnetwork7

800

kmWaterNetworkinHongKong200

ServiceReservoir(SR)SupplyZonesEachSRSupplyZonefurtherdividedintoseveralDistrictMeteringAreas(DMA)orPressureManagementAreas(PMA)DMADMAPMAPMAActiveLeakageControl(ALC)SchematicDiagramofaDMAFMServicereservoirFlowmeterFMSRSRCut-lineValueBoundaryValveSupplyzoneboundaryDMAboundarySRFMActiveLeakageControl(ALC)ContinuousmonitoringonaDMAbasisTypicalsetupofflowmeterchamberGSMDataLoggerEMFlowmeter(Transmitter)EMFlowmeter(FlowSensor)FLOWEMFlowmeter(BatteryPack)PressuretappingpointActiveLeakageControl(ALC)Real-timemonitoringSetupforcontinuouspowersupplyanddataloggingdeviceunderstudyInlinehydropowerharnessingdeviceOnlinemonitoringinstrumentWirelessdatatransmitterActiveLeakageControl(ALC)NoiseloggerplusSMSrepeaterforsendingleaknoisedatatoacentralmonitoringcomputerviaSMSmessages(Patrolnotrequired)SmallerGSMnoiseloggersNoiseloggerwithcorrelatingfunctionplusGPRSmodulefortransmittingdataNoiseLoggersActiveLeakageControl(ALC)NoiseloggersinstalledoverthenetworkActiveLeakageControl(ALC)TwosensorsdeployedonvalvesoneithersideofthesuspectedleakpositionLeaknoisetransmittedtosensorswithatimedifferenceandthentothecorrelatorviathetransmittersCalculatesleaklocationusingformula

L=LLVxTDValveLeakSensorTransmitterCorrelatorSensorTransmitterValveD-(VxT)2PinpointingusingLeakNoiseCorrelator(LNC)LocatingLeaks(測)NoiseloggerConfirmingLeaks(定)Monitoring(監(jiān))NightflowtestresultsPin-pointingLeaks(檢)LNCActiveLeakageControl(ALC)Supply

ZoneunderexcessivepressureSupplyZoneunderDesirablepressureSupplyZoneunderexcessivepressurewatermainVeryhighpressureheadHighpressureheadServicereservoirDesirablepressureheadPressureManagement(PM)Theleakage–pressurerelationship:WhereListheleakageflowratePisthepressureheadinthepipeCisaconstantleakagecoefficientNisaconstantleakageexponent

PressureManagement(PM)SupplyZonewithpressuremanagementServicereservoirDesirablepressureheadDesirablepressureheadDesirablepressureheadSupplyZonewithpressuremanagementPressureReducingValvePressureReducingValvewatermainPressureManagement(PM)SchematicDiagramofaPMAFMServicereservoirFlowmeterFMSRSRCut-lineValueBoundaryValvePressurereducingvalveDMAboundarySRFMPressureManagement(PM)TypicalsetupofaPMAchamberPressureReducingValve(PRV)StrainerEMFlowmeter(FlowSensor)FLOWGSMDataLoggerEMFlowmeter(Transmitter)PressureGauges26PressureManagement(PM)PressurebeforePMMin.NightFlowbeforePMPressureafterPMMin.NightFlowafterPMImplementationofPressureManagementPressureManagement(PM)SpeedyandQualityRepair(SQR)TimeVolumeofwaterlostCumulativewaterlostovertimeAwarenessLocationRepairEffectoftimeonvolumeofwaterlostthroughleakageWaterLossManagementTeamsLeakDetectionUnitDistrictMaintenanceTeamofOperationsRegionsSpeedyandQualityRepair(SQR)RoutineALCIncreasingfrequencyofALC&SQRcyclesFlowFlowmeterDistrictBoundaryValve(DBV)DMALeakagelevelTimeLowRiskLimit(Networkinahealthystate)SteppedupALCMediumRiskLimit(Networkdeservingcloserattention)LeakdetectionandRepairCombiningALCandSQReffortsSteppedupALCLeakagelevelTimeLowRiskLimitMediumRiskLimitR&RWorksLowRiskLimitR&RInvestigationZoneIncreasingfrequencyofALC&SQRcyclesPipelineandAssetManagement(PAM)RoutineALCRoutineALCMNFDRDiscrepancyRatioMinimumNightFlowTheLeakageRiskModelHealthyProbablyhealthywithlegitimatenightuseLeakageunlikely,butunauthorisedconsumptionPAMtobeimplementedALC,PM,SQRtobesteppedupPipelineandAssetManagement(PAM)DiscrepancyRatio(DR)DR=FlowintoaDMAoveraperiodoftimeTotalmeteredconsumptionwithintheDMAforthesameperiodoftimePipelineandA