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Home My WebLink About03-19-07 EO&WR Committee PacketOtay Water DistrictOtay Water District Integrated Water Resources PlanIntegrated Water Resources Plan March 2007March 2007 TodayToday’’s Agendas Agenda ►►Purpose of IRPPurpose of IRP ►►IRP Process IRP Process ►►Objectives & Priorities of the IRPObjectives & Priorities of the IRP ►►Water Supply Options and PortfoliosWater Supply Options and Portfolios ►►Evaluation ResultsEvaluation Results ►►Portfolio ScreeningPortfolio Screening ►►Implementation StrategyImplementation Strategy Otay Water DistrictOtay Water District’’s IRP Missions IRP Mission IRP Mission StatementIRP Mission Statement IRP Goals and ObjectivesIRP Goals and Objectives To find the best mix of imported water, local supplies and conservation to meet demands in a cost-effective manner while also incorporating environmental impacts, implementation risk, and other factors To find the best mix of imported water, local supplies and conservation to meet demands in a cost-effective manner while also incorporating environmental impacts, implementation risk, and other factors District has been addressing needs through 2010:District has been addressing needs through 2010: 2010201020052005 3% Recycled3% Recycled 59% Treated Imported Water59% Treated Imported Water Directly from SDCWADirectly from SDCWA 38% Local Agreements 38% Local Agreements for Treatmentfor Treatment 16% Recycled16% Recycled59% Local Agreements 59% Local Agreements for Treatmentfor Treatment 25% Treated Imported Water25% Treated Imported Water Directly from SDCWADirectly from SDCWA However there are growing water demandsHowever there are growing water demands 2030 2005 38,000 acre-feet 82,000 acre-feet 90,000 80,000 70,000 60,000 50,000 40,000 30,000 20,000 10,000 0 De m a n d s ►►Even with conservation, Even with conservation, water demands are water demands are expected to double in 25 expected to double in 25 yearsyears ►►Puts additional pressure Puts additional pressure on limited local supply on limited local supply and imported waterand imported water Source: OtaySource: Otay’’s Draft 2005 Urban s Draft 2005 Urban Water Management PlanWater Management Plan What is an IRP?What is an IRP? An IRP is not a master planAn IRP is not a master plan ►►An IRP represents a longAn IRP represents a long--term strategyterm strategy ►►Shows tradeShows trade--offs between different supply offs between different supply and demandand demand--side optionsside options ►►Provides an opportunity for a fresh lookProvides an opportunity for a fresh look ……which all guides master planning for specific facilities which all guides master planning for specific facilities and CIP developmentand CIP development DistrictDistrict’’s approach will allow for a successful IRPs approach will allow for a successful IRP Define Planning Define Planning Objectives & Objectives & Performance Performance MeasuresMeasures Supply OptionsSupply Options (building blocks)(building blocks) Build PortfoliosBuild Portfolios (using themes)(using themes) Preferred Strategy RefineRefine AnalysisAnalysis SystemsSystems ModelModel Raw PerformanceRaw Performance Score CardScore Card STELLA RankRank PortfoliosPortfolios CDP Objectives & Priorities of the IRPObjectives & Priorities of the IRP Planning Objectives and Relative Importance Planning Objectives and Relative Importance Water Supply Options and PortfoliosWater Supply Options and Portfolios District staff & CDM identified over 30 potential District staff & CDM identified over 30 potential options for addressing future water needsoptions for addressing future water needs ►►Additional Local Treatment AgreementsAdditional Local Treatment Agreements 44 ►►Additional Recycled WaterAdditional Recycled Water 88 ►►GroundwaterGroundwater 99 ►►Ocean DesalinationOcean Desalination 55 ►►ConservationConservation 33 ►►TransfersTransfers 33 ►►Additional ImportedAdditional Imported Treated WaterTreated Water 11 Final portfolios Final portfolios ––combination of supply options combination of supply options based on themes of objectivesbased on themes of objectives ►►Water quality A: minimize potential issues with Water quality A: minimize potential issues with disinfection byproductsdisinfection byproducts ►►Water Quality B: reduce salinity in potable and recycled Water Quality B: reduce salinity in potable and recycled waterwater ►►Reliability A: minimize potential deficits under drought Reliability A: minimize potential deficits under drought conditionsconditions ►►Reliability B: minimize potential deficits under seismic Reliability B: minimize potential deficits under seismic emergency conditionsemergency conditions ►►Affordability: minimize rate impactsAffordability: minimize rate impacts Final portfolios (contFinal portfolios (cont ’’d)d) ►►Baseline: treated water purchases directly from SDCWA Baseline: treated water purchases directly from SDCWA to supply all future demandsto supply all future demands ►►Diversity A: maximize the number of sources and Diversity A: maximize the number of sources and contractual arrangements with other agenciescontractual arrangements with other agencies ►►Diversity B: expand the use of existing nonDiversity B: expand the use of existing non--CWA CWA sources and arrangements with other agenciessources and arrangements with other agencies ►►Flexibility: maximize the number of take points into the Flexibility: maximize the number of take points into the systemsystem Evaluation resultsEvaluation results Cumulative Deficit During Critical Dry Hydrology and Imported Shortage Conditions 9,037 21,862 0 2,833 2,983 110,864 0 908 180 20,000 40,000 60,000 80,000 100,000 120,000 Water Quality A: DBP Water Quality B: TDS Reliability A: Drought Reliability B: Seismic Affordability Baseline Diversity A Diversity B: Expand Existing Flexibility AF / a l l s h o r t a g e y e a r s 2030 Shortage During a Three Month Emergency 20,101 24,367 23,813 16,242 26,887 29,137 21,921 24,894 27,790 0 5,000 10,000 15,000 20,000 25,000 30,000 35,000 Water Quality A: DBP Water Quality B: TDS Reliability A: Drought Reliability B: Seismic Affordability Baseline Diversity A Diversity B: Expand Existing Flexibility AF/ 3 M o n t h s Shortage during a three month emergency - AF Total Demand over 3 months (normal hydrology) NPV Capital Cost 267 164 132 380 52 - 381 150 245 0 50 100 150 200 250 300 350 400 Water Quality A: DBP Water Quality B: TDS Reliability A: Drought Reliability B: Seismic Affordability Baseline Diversity A Diversity B: Expand Existing Flexibility $/ M Mi l l i o n $ NPV Unit Cost 1,465 1,562 1,197 1,940 1,087 952 1,440 1,019 1,329 - 500 1,000 1,500 2,000 2,500 Water Quality A: DBP Water Quality B: TDS Reliability A: Drought Reliability B: Seismic Affordability Baseline Diversity A Diversity B: Expand Existing Flexibility $ / A F Diversity -- Percent Contribution of Largest Source 58% 70% 37%38% 47% 91% 42% 62% 78% 0% 20% 40% 60% 80% 100% Water Quality A: DBP Water Quality B: TDS Reliability A: Drought Reliability B: Seismic Affordability Baseline Diversity A Diversity B: Expand Existing Flexibility Portfolio ScreeningPortfolio Screening Rankings Based on Average Objective WeightsRankings Based on Average Objective Weights Number of Times as Top 3 10 0 10 5 3 0 12 000 3 6 9 12 15 Water Quality A:DBP Water Quality B:TDS Reliability A: Drought Reliability B: Seismic Affordability Baseline Diversity A:Diversity B: Expanding Existing Flexibility Portfolio Number o f T i m es Conclusions on TopConclusions on Top--Scoring PortfoliosScoring Portfolios Feasible supply options included in at least 2 of the portfoliosFeasible supply options included in at least 2 of the portfolios:: ►►Additional ConservationAdditional Conservation ►►Central Valley and Land Fallowing TransfersCentral Valley and Land Fallowing Transfers ►►Groundwater projects (Desal and Conjunctive Use)Groundwater projects (Desal and Conjunctive Use) ►►55--10 MGD Ocean Desalination (Poseidon, or Sweetwater/City of SD10 MGD Ocean Desalination (Poseidon, or Sweetwater/City of SD’’s s South Bay project)South Bay project) ►►Stripping Plant along Spring Valley Trunk LineStripping Plant along Spring Valley Trunk Line ►►North District Recycled Water ConceptNorth District Recycled Water Concept ►►Mexico Desalination Plant, Mexico Desalination Plant, RosaritoRosarito BeachBeach Conclusions on TopConclusions on Top--Scoring Portfolios (contScoring Portfolios (cont’’d)d) Other feasible supply options included in 1 of the Top 3 portfolOther feasible supply options included in 1 of the Top 3 portfolios:ios: ►►SD17 Agreement with City of San Diego SD17 Agreement with City of San Diego ►►Additional Purchases from South Bay WRPAdditional Purchases from South Bay WRP ►►North of Delta TransfersNorth of Delta Transfers Implementation PlanImplementation Plan Implement Implement 5,000 AFY ocean 5,000 AFY ocean desalination desalination projectproject11 Implement Implement Chula Vista Chula Vista stripping stripping plant optionplant option11 Implement Implement ••Additional Additional ConservationConservation ••SD17 Agreement with SD17 Agreement with City of San Diego to City of San Diego to treat raw water at treat raw water at Alvarado WTPAlvarado WTP ••Additional purchases Additional purchases from SBWRPfrom SBWRP ••North District North District Recycled Water Recycled Water ConceptConcept ••Water banking (5000 Water banking (5000 AFY)AFY) Are ocean Are ocean desalination desalination projects feasible?projects feasible? N O N O Is new supply Is new supply implemented to date implemented to date less than 25,000 AFY?less than 25,000 AFY? YESYES No ActionNo Action N O N O N O N O Are groundwater Are groundwater conjunctive use conjunctive use projects feasible?projects feasible? Implement Implement Brackish GW Brackish GW Demineralization Demineralization Project Project (Santee/El (Santee/El MonteMonte3 43 4 or or Lower Lower Sweetwater)Sweetwater)ImplementImplement Additional or Additional or new ocean new ocean desalination desalination project project 5,000 AFY 5,000 AFY (Poseidon(Poseidon oror SCP)SCP) Spring Valley Spring Valley Stripping plant Stripping plant optionoption22 Implement Implement Brackish GW Brackish GW Demineralization Demineralization project project (Santee/El (Santee/El MonteMonte3 4 3 4 or or Lower Lower Sweetwater)Sweetwater) Implement Implement water water transfers transfers (5,000 (5,000 AFY)AFY) Implement Implement GW GW conjunctive conjunctive use project use project (Santee/El (Santee/El MonteMonte44 or or Middle Middle Sweetwater)Sweetwater) YESYES YESYES Implement Implement additional ocean additional ocean desalination (if desalination (if total yield of total yield of ocean ocean desalination desalination projects projects implemented to implemented to date is less than date is less than 5,000 AFY)5,000 AFY) 2007 2007 2010 2010 2015 2015 2020 2020 20302030 TimelineTimeline LEGENDLEGEND Implement Project Implement Project Minimal Capital Cost ProjectMinimal Capital Cost Project Maximum Capital Cost ProjectMaximum Capital Cost Project NOTESNOTES 1 If ocean desalination projects and stripping options are not f1 If ocean desalination projects and stripping options are not feasible, implement easible, implement Santee/El Monte brackish groundwater demineralization (with the Santee/El Monte brackish groundwater demineralization (with the use of the LMSE).use of the LMSE). 2 If Chula Vista stripping plant is not already in place.2 If Chula Vista stripping plant is not already in place. 3 If not already in place. 3 If not already in place. 4 Assumes use of LMSE pipeline.4 Assumes use of LMSE pipeline.