A Sewer Asset Management Case Study
2018 IACC S29: Asset Managment Case Study10/24/2018A Sewer Asset ManagementCase StudyCity of Walla WallaA Sewer Asset Management Case Study – City of Walla WallaAgendaToday’s talk:Five Step ApproachNOT about “what is asset management”Data InventoryNOT why you should do assetmanagementPerformance AssessmentIS how Walla Walla approached assetmanagement of the sewer collectionsystemRisk AssessmentCondition AssessmentPrioritizeA Sewer Asset Management Case Study – City of Walla Walla1
2018 IACC S29: Asset Managment Case Study10/24/2018The Problem150 miles of pipe from 6”to 36” diameter.Estimated 200M asset.Significant I/I problems,overflowsCity wanted to target 150pipes forrenewal/replacement over10 years.No major hydraulicbottlenecksCondition ratings showedlarge portion of system invery poor condition – needbetter way to prioritizeA Sewer Asset Management Case Study – City of Walla WallaObjectives Evaluate existing collection system– Create hydraulic model – ID existing bottlenecks &future– Develop master plan for extension to serve entireUGA– Develop pipe scoring criteria to prioritize replacement Risk of Failure – incorporating City’s pipe condition ratings Consequence of Failure – additional criteria to furtherprioritize Ability to update in-house utilizing GISA Sewer Asset Management Case Study – City of Walla Walla2
2018 IACC S29: Asset Managment Case Study10/24/2018Objectives – Cont. Develop 10-year CIP––––Determine collection system replacement costsCoordinate with IRRPFocus on addressing overflows within next 5 yearsIncorporate existing improvement plan for WWTP Document financial condition and ability to fundCIP Satisfy WDOE requirements for a GeneralSewer PlanA Sewer Asset Management Case Study – City of Walla WallaStep 1 – Data InventoryCompile the data you already have Location Mapping Condition assessments(CCTV inspection) Granite Maintenance history(cleaning frequency andcauses) Collapses and emergencyrepairs Customer complaints Basement backups Previous evaluations(master plans, flow studies) Institutional knowledgeA Sewer Asset Management Case Study – City of Walla Walla3
2018 IACC S29: Asset Managment Case Study10/24/2018Walla Walla – GISCity began developing GIS system in 2000.City has dedicated GIS departmentGIS data for each pipe includes: material,date of install, invert elevations.GIS track locations of backup claims.Track “hot list” of spots visited monthly andquarterly for preventative maintenance.A Sewer Asset Management Case Study – City of Walla WallaData Inventory - CCTVCity began CCTV of sewer system in1990.CCTV 20% of system each year.City has reviewed tapes and determinedcondition scores for all pipes in thesystem – using Granite XP softwareA Sewer Asset Management Case Study – City of Walla Walla4
2018 IACC S29: Asset Managment Case Study10/24/2018Prioritization CriteriaA Sewer Asset Management Case Study – City of Walla WallaStep 2 – Performance AssessmentHYDRAULIC CAPACITY(EXISTING AND FUTURE)FLOW DATA UTILIZEDWINTER WATER SERVICEMETER DATAHYDRAULIC MODEL CALIBRATED WITH FIELDDATAASSESSMENT SHOWED AFEW BOTTLENECKS – BUTNOTHING SIGNIFICANT.A Sewer Asset Management Case Study – City of Walla Walla5
2018 IACC S29: Asset Managment Case Study10/24/2018Sewer BasinsA Sewer Asset Management Case Study – City of Walla WallaHydraulicsA Sewer Asset Management Case Study – City of Walla Walla6
2018 IACC S29: Asset Managment Case Study10/24/2018Prioritization CriteriaA Sewer Asset Management Case Study – City of Walla WallaStep 3 – Condition Assessment “Likelihood of Failure” - LOF Pipe and manhole inspection Condition assessment methods:– Subjective grading – visual inspection– Distress-based evaluation – defect coding– Non-Destructive Testing MethodsA Sewer Asset Management Case Study – City of Walla Walla7
2018 IACC S29: Asset Managment Case Study10/24/2018Granite XP ScoresA Sewer Asset Management Case Study – City of Walla WallaWalla Walla LOF Score 50% - Granite Pipe Score10% - Pipe Material (Conc 100, Clay 90, DI 80, PVC 0)10% - Time since last CCTV inspection30% - O & M Frequency (Monthly 100, Qtr 50, Routine 0) 20 – Overflow/claim 40 – 2x Overflow/claim 10 – 6-inch diameter pipesA Sewer Asset Management Case Study – City of Walla Walla8
2018 IACC S29: Asset Managment Case Study10/24/2018A Sewer Asset Management Case Study – City of Walla WallaStep 4 – Risk Assessment“Consequence of Failure” – COFLocationLand useTraffic intensityAccess for repairProximity tosensitiveenvironmentsProvides serviceto critical facilityInfiltration and InflowBurial DepthSoil type can leadto higher failureIndicates degreerisk from highof difficulty forgroundwateremergencyPotential erosionrepairsif break occursIncreasedIncreased costsexcavation costsfor bypasspumpingPipe DiameterAffects rehabmethod andexecution ofrepairsPeak FlowsIncreased costsfor bypasspumpingDegree ofPipes with samecontaminationfrom surcharging diameter canhave differentor failurepeak flowsA Sewer Asset Management Case Study – City of Walla Walla9
2018 IACC S29: Asset Managment Case Study10/24/2018Walla Walla COF Score 20% - Pipe Diameter (36”-100, 18”-50, 8”-10)20% - Peak Flow (scaled by highest peak flow in system)20% - Pipe Depth (30’-100, 15’-40, 10’-20)20% - Location (Distance from major waterway, road classifications,Railroad, and local important locations such asHistoric Downtown, State Penitentiary, VAHospital, Schools) 20% - I & I Volume (scaled by highest I/I in system)A Sewer Asset Management Case Study – City of Walla WallaStep 5 – Prioritize1.0Riskof FailureScorePRIORITY APRIORITY B0.5PRIORITY C0.00.00.51.0Consequence of Failure ScoreA Sewer Asset Management Case Study – City of Walla Walla10
2018 IACC S29: Asset Managment Case Study10/24/2018A Sewer Asset Management Case Study – City of Walla WallaLOF ScoresA Sewer Asset Management Case Study – City of Walla Walla11
2018 IACC S29: Asset Managment Case Study10/24/2018COF ScoresA Sewer Asset Management Case Study – City of Walla WallaPriority ScoresA Sewer Asset Management Case Study – City of Walla Walla12
2018 IACC S29: Asset Managment Case Study10/24/2018Capital Improvement Plan “F” assigned to pipes with score 50 129 pipes – 6% of system– 43% already planned for replacement – IRRP– Remaining 73 pipes mapped, developed CIP– Expanded projects to include adjacent “D”rated pipes where it made sense to– Resulted in 200 pipe segments in CIP– Approximately 15M over next 10 yearsA Sewer Asset Management Case Study – City of Walla WallaEstimated Yearly ReplacementBudget RangeA Sewer Asset Management Case Study – City of Walla Walla13
2018 IACC S29: Asset Managment Case Study10/24/2018Summary Not rocket science – you can do it START GATHERING DATA! (GIS)– Pipe Material– Condition ratings– Time since last CCTV inspection– O & M Frequency– Sewer back-up/claimA Sewer Asset Management Case Study – City of Walla WallaA Sewer Asset Management Case Study – City of Walla Walla14
2018 IACC S29: Asset Managment Case Study10/24/2018Questions?Frank Nicholson, PEfnicholson@wallawallawa.govAlex Fazzari, PEafazzari@jub.comA Sewer Asset Management Case Study – City of Walla Walla15
A Sewer Asset Management Case Study –City of Walla Walla Granite XP Scores A Sewer Asset Management Case Study –City of Walla Walla Walla Walla LOF Score 50% - Granite Pipe Score 10% - Pipe Material (Conc 100, Clay 90, DI 80, PVC 0) 10% - Time since last CCTV inspection 3
SECTION 6: SANITARY SEWER SERVICE LINES 6.1 Scope SEWER-26 6.2 Quality Assurance SEWER-26 6.3 Job Conditions SEWER-26 6.4 Pipe SEWER-26 6.5 Flexible Couplings SEWER-27 6.6 General SEWER-27 6.7 Trenching, Backfilling and Compaction SEWER-27 6.8 Taps SEWER-27
2.Tysons West Pump Station, Force Main, and gravity sewer 115.4M 3.Enlarge Accotink Interceptor from 30" sewer to 42" 33.0M 4.Lakevale sewer project 2.2M 5.Enlarge 12" sewer to 18" sewer in Merrifield 2.3M 6.Enlarge and relocate gravity sewers along Route 1 BRT 29.5M Project in Construction: Upsize Alexandria Renew line 58/615M
1 Introduction: There are two types of public sewer systems used in the United States for collecting and conveying sanitary sewage, combined sewer systems (CSS) and sanitary sewer systems (SSS). Combined sewer systems collect and convey sanitary sewage and urban runoff in a common piping system.
Management Structure of NBF NBF's asset management is entrusted to the asset management company. The asset management company conducts asset management of NBF based on the Asset Management Entrustment Agreement concluded with NBF. (i) Organizational Structure for Operation of Duties of the Asset Management Company
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37. Sewer, Collector - A line that receives wastewater directly from property sewer laterals and transports the wastewater to tmnk sewers. 38. Sewer, Lateral - A line from a single user to the collector sewer. A lateral is a sewer that has no other common sewers discharging into it. 39
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