CHEOPS_Enhancement_Stakeholder_Presentation_1_8-1-2013

NC Department of Water ResourcesStakeholder Meeting #1Catawba-Wateree River Basin ModelingAugust 1, 2013Ian McMillanNC Department of Water [e-mail] WilliamsHDR Engineering, Inc. of the [e-mail]
Catawba-Wateree River Basin Modeling• SL 2010-143 Overview• Catawba-Wateree River Basin Overview• CHEOPSTMModel History and Overview• CHEOPSTMModel Enhancement for SL 2010-143 Compliance• Implementation Timeline• QuestionsAGENDA2
SL 2010-143 Overview3
North Carolina SL 2010-1434Basin-wide Hydrologic ModelsThe Department shall develop a basin-wide hydrologic model for each of the 17 major river basins in the State.Each basin-wide hydrologic model shall include surface water resources within the river basin, including:Transfers into and out of the river basin (IBTs)Current withdrawalsEcological flowIn-stream flow requirementsProjections of future withdrawalsAn estimate of return flows within the basinInflow dataLocal Water Supply Plans
North Carolina SL 2010-1435Additionally, each basin-wide hydrologic model shall:Be designed to simulate the flows of each surface water resources within the basin under a variety of scenarios/conditions, including when:Yield is inadequate to meet all water use needsYield is inadequate to meet all essential water usesEcological flow may be adversely affectedBe based on data that is of public record and open to public review and comment
North Carolina SL 2010-1436Important Definitions:"Surface water resource" means any lake, pond, river, stream, creek, run, spring, or other water flowing or lying on the surface of the earth."Prevailing ecological conditions" means the ecological conditions determined by reference to the applicable period of record of the USGS stream gauge data, including data reflecting the ecological conditions that exist after the construction and operation of existing flow modification devices, such as dams, but excluding data collected when stream flow is temporarily affected by in-stream construction activity.“Ecological flow” means the stream flow necessary to protect ecological integrity.
North Carolina SL 2010-1437Important Considerations:Interstate cooperation is required by SL 2010-143, to the extent practical.2010 SC vs. NC Settlement Agreement outlines required cooperation in the Catawba-Wateree River BasinStates that CHEOPSTMmodel will be used for planning purposes in the Basin.Planning includes NC DENR, SC DHEC, SC DNR, NC WRC, Duke Energy, CRWSP and CWWMGExisting hydrologic models must be used if available for a river basin, and may be modified as necessary to meet the requirements of SL 2010-143.
North Carolina SL 2010-1438Important Considerations:Approval by the Environmental Management Commission (EMC):Completed model submitted to EMC for approvalPublic notice given for 60-day public comment periodReceive and review public commentsAct on the model following comment periodAny substantial modifications to the model require the approval process described above.
North Carolina SL 2010-1439Basin-wide models completed:Broad River BasinCape Fear River BasinNeuse River BasinBasin-wide models in progress:Catawba-Wateree River BasinCombined Cape Fear/Neuse River BasinsRoanoke River BasinTar-Pamlico River BasinYadkin-Pee Dee River Basin
Catawba-Wateree River Basin Overview10
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12CATAWBA-WATEREERESERVOIRS-13 hydro stations-11 interconnected reservoirs- 1050 feet vertical fall over 220+ river miles-First river in US to be comprehensively developed for power generation-768,000 acre-feet of usable water storage
Importance of the Catawba-Wateree River Basin to the Carolinas•Drinking water for nearly 2 million peopleExpect 200% increase in public water supply demand in the next 50 years•Approximately 24% of Duke Energy’s generation capacity in the Carolinas depends on water from the Catawba-Wateree Hydro ProjectTwo fossil stations, two nuclear stations13 hydro stationsElectricity demand is expected to more than double over the next 50 years•Over 10 million recreation visits per year13
CHEOPSTMModel Overview14
Catawba-Wateree CHEOPSTMModel Overview15• Initially developed in the 1990’s to assist Duke Energy in evaluations for the modernization of the hydroelectric facilities along the Catawba-Wateree• Updated in 2004 for evaluations of operational alternatives identified in the Catawba-Wateree FERC Relicensing• The model was updated throughout the relicensing to include additional functionality (LIP, HIP, Sedimentation, etc.)
Model DevelopmentTypical Sequence16Data CollectionHydrology CalculationInput to ModelVerificationBaseline DefinitionScenario Comparisons (Incremental to Baseline)Ideally 30 YearsPhysical, Operational and GenerationHistoric OperationsCurrent or Future Operations/Conditions
Model DevelopmentPhysical Data Collection‒Review of client drawings and documents‒Site visit(s) ‒Operational data collection‒Review of project documents (internal and FERC)‒Discussion with operations supervisors and project engineers‒Implementation of initial model settings‒Referred to as a “scenario”17
Model DevelopmentCalibrated against historical data‒Reservoir elevation hydrographs and duration curves‒Documented hydro plant and river flows (gage and powerhouse data)‒Powerhouse generation dataAfter calibrating, a Base Case is developed and used as a baselineAdditional scenarios are developed and run, then output data compared to Base Case for relative comparisons18
Process Overview19More PlantsTo Process?End ProcessBegin ProcessAssessDownstreamHydro PlantRequirementsAssess DailyReservoirFluctuationConstraintsAssessEndingElevationAssessDownstreamHydro PlantCapacityCalculateDetailedInflowsDetermineOutflowNoYes
CHEOPSTMModel Enhancement for SL 2010-14320
CHEOPSTMModel EnhancementUpdates to the model required for SL 2010-143 compliance‒Update base model to ‘.net’ format‒Add nodes for each withdrawal and return ≥100,000 gpd on major Catawba tributaries in NC & SC‒Ability to add future user defined nodes and inflow allocation‒Allow server access for individual users‒Universal water demand multiplier for public water supply‒Incorporation of water shortage response plans with universal on/off switch (Catawba-Wateree Low Inflow Protocol (LIP))‒Updated agricultural water demand projections based on seasonal use patterns‒Detailed documentation, including user’s manual, for NC-DWR model editing‒Ability to calculate water yield scenarios compliant with SL 2010-143‒Public stakeholder meetings and model training21
CHEOPSTMModel EnhancementModeling Technical Team (MTT):‒Technical advisory committee for model enhancement‒Consists of NC-DWR, SC-DNR, Catawba-Wateree Water Management Group (Represented by HDR)‒4 meetings held since FebruaryStakeholder Meetings:‒Kickoff Meeting / Model Introduction (Aug. 1, 2013)‒Detailed model review and basin layout plan‒Formal CHEOPSTMtraining sessionEMC Approval:‒Upon completion of model enhancement and stakeholder meetings, submit to EMC for review‒Public notice and 60-day comment period‒Acceptance of model (or modification if required)22Rocky Shoals Spider Lilies at Fishing Creek Reservoir
Recent UpdatesUpdated CHEOPS model to new code platform (‘.net’) for improved efficiency in model run time23
Recent UpdatesZoom of basin with nodes‒Right‐click view/editing of node info‒Future ability to add additional nodes24
Recent UpdatesInput options for flows at each node‒Model user interface and Excel workbook25
Recent UpdatesNode Inputs stored in database are likely to include: ‒Name/Entity ‒Position ‒Drainage area ‒Downstream node ‒Distance to downstream node/reservoir ‒Travel time to downstream node/reservoir (based on initial discussions, will be 0 unless needed for calibration) ‒Accretions • Percent of reservoir inflows to attribute to this node • Time series of flows to be removed from reservoir inflows ‒If withdrawal node in reservoir, lowest functional elevation of withdrawals inlet ‒Withdrawal or returns (discharges) monthly values ‒Reduction factors depending upon LIP stage ‒If not abiding by LIP, other reduction factor rules as needed26
Implementation Timeline27
Proposed ImplementationOngoing‒MTT input to model developmentAugust 1, 2013‒Stakeholder Workshop #1 (Kickoff)October, 2013‒Stakeholder Workshop #2 (Model review)December, 2013‒Stakeholder Workshop #3 (Model training)January, 2014‒Estimated model completion / Present to EMCMay, 2014‒Model made publicly available on NC-DWR server28Intake Tower at Lake James Under Construction(circa 1919)New Bridgewater Powerhouse at Lake James (2012)
Questions?29