DSM2DSM2 CaliforniaCalifornia AqueductAqueduct ExtensionExtension

Presented to California Water and Environmental Modeling Forum March 1, 2005 Introduction and Project Goals

• CH2M HILL is constructing a DSM2 model of the California Aqueduct on behalf of DWR’s Municipal Water Quality Investigation (MWQI) program and the State Water Project Contractors • Goals: – Detailed evaluation of Aqueduct Hydrodynamics, Water Quality, and Operations – Forecasting short-term and long-term water quality – Potential for Real-time analysis of Water Quality throughout system Model Coverage and Geometry

• The model includes – California Aqueduct, South Bay Aqueduct – East Branch to Silverwood Lake, West Branch to Pyramid Lake, – San Luis Reservoir and O’Neill Forebay, and – DMC from Tracy Pumping Plant to the Mendota Pool – 580 miles in total • EXCEL tool built to generate ASCII cross section files • Pipes and Tunnels treated as channels Model Area Model Schematic Boundary Conditions

• Flow at Tracy and Banks • San Luis Reservoir Operations • DMC and O’Neill Forebay Operations • Diversions to South Bay Aqueduct and West Branch (pumping plant data) • Contractor Diversions Database • Mass Balance Closure Terms Application-specific issues

• Treatment of Check Structures – gates and weirs to control elevation • Use of Object to Object programming – DSM2 tool that allows for instantaneous transfer of water from location to another • Flow into South Bay Aqueduct • O’Neill Pumping and Generating Flows • Gianelli Pumping and Generating Flows • Flow into South Bay Aqueduct • Flow south out of O’Neill Forebay into California Aqueduct • DMC Wasteways can be handled with object to object flows Initial Calibration (1/1/2001 to 12/31/2003)

• Flow – Closure terms • Stage – culverts and weirs to control stage • EC – Measured Data along California Aqueduct at Checks 12, 13, 18, 21,29, 41, and 66 – Measured Data in the DMC at the O’Neill Intake and Checks 20 and 21(upstream of DMP) EC at Check 13 (Downstream of O’Neill Forebay)

EC Calibration - Check 13

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EC (mS/cm) Model Output EC - FullAq09 Test2A 200 Error (Modeled - Observed)

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-200 01/01/2001 03/01/2001 05/01/2001 07/01/2001 09/01/2001 11/01/2001 01/01/2002 03/01/2002 05/01/2002 07/01/2002 09/01/2002 11/01/2002 01/01/2003 03/01/2003 05/01/2003 07/01/2003 09/01/2003 11/01/2003 EC at Check 41 (Downstream of Edmonston Pumping Plant)

EC Calibration - Check 41

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Measured EC (mS/cm) 200 Model Output EC - FullAq09 Test2A Error (Modeled - Observed) 100

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-200 01/01/2001 03/01/2001 05/01/2001 07/01/2001 09/01/2001 11/01/2001 01/01/2002 03/01/2002 05/01/2002 07/01/2002 09/01/2002 11/01/2002 01/01/2003 03/01/2003 05/01/2003 07/01/2003 09/01/2003 11/01/2003 EC in San Luis Reservoir

EC Calibration - San Luis Reservoir

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Measured 300 Model Output EC - FullAq09 Test2A EC (mS/cm) 200 Error (Modeled - Observed)

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-200 01/01/2001 03/01/2001 05/01/2001 07/01/2001 09/01/2001 11/01/2001 01/01/2002 03/01/2002 05/01/2002 07/01/2002 09/01/2002 11/01/2002 01/01/2003 03/01/2003 05/01/2003 07/01/2003 09/01/2003 11/01/2003 EC Calibration Downstream of O’Neill with Major Flows

EC Calibration - Check 13 with Controlling Flows

1000 10000 Measured EC Model Output EC - FullAq09 Test2A 900 San Luis Releases to O'Neill Forebay 9000 DMC pumped to O'Neill Forebay Banks Flow 800 8000

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0 0 01/01/2001 03/01/2001 05/01/2001 07/01/2001 09/01/2001 11/01/2001 01/01/2002 03/01/2002 05/01/2002 07/01/2002 09/01/2002 11/01/2002 01/01/2003 03/01/2003 05/01/2003 07/01/2003 09/01/2003 11/01/2003 Areas for Continued Development and Improvement

• San Luis Reservoir (Currently well mixed) • Stormwater inflows and associated EC • Treatment of mass balance error terms • Stage calibration • DSM2 Database Version and Gate Operations flexibility Potential Future Applications

• Join California Aqueduct grid with Delta grid and San Joaquin River grid • Recirculation Studies • Forecasting capability • CALSIM link Acknowledgements

• Thanks to DWR Delta Modeling Staff for assistance in troubleshooting modeling issues (Tara, Parviz, Bijaya, Tawnley, Michael, Eli)

• Questions?