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Reservoir Routing

Reservoir Routing. CEE 3430 – Engineering Hydrology David Rosenberg March 26, 2012. Motivating Problem. How do reservoirs, stream reaches, and distributed elements alter the runoff hydrograph?. Potential Methods Hydrologic (steady flow) Level pool (Modified Puls)

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Reservoir Routing

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  1. Reservoir Routing CEE 3430 – Engineering Hydrology David Rosenberg March 26, 2012

  2. Motivating Problem How do reservoirs, stream reaches, and distributed elements alter the runoff hydrograph? • Potential Methods • Hydrologic (steady flow) • Level pool (Modified Puls) • Muskingum method (variable discharge-storage) • Hydraulic (unsteady flow) • Saint-Venant equations (1871) CEE 3430 – Engineering Hydrology

  3. Learning objectives • Identify reservoir system components • Describe the storage continuity equation • Use the level pool method to derive reservoir output • Specify outlet characteristics • Route inflow through the reservoir and outlet • Evaluate if the basin/outlet are properly sized CEE 3430 – Engineering Hydrology

  4. Dry Canyon, Logan Detention Basin above Cliffside Terrace CEE 3430 – Engineering Hydrology

  5. Outlet specification • Unmanned Both give a stage (h) vs discharge (Qout) relationship CEE 3430 – Engineering Hydrology

  6. Level-Pool Routing Steps • Estimate inflow hydrograph, I(t) • Establish outlet stage-discharge relationship (h vs Q) • Establish basin stage-volume relationship (h vs V) • Establish discharge-volume relationship (Q vs V) and Q vs (2S/Δt + Q) • Start at time step 1: S1, I1, Q1, I2, Δt known • Proceed with iterative calculations CEE 3430 – Engineering Hydrology

  7. Conclusions • Inflows, storage characteristics, and outlet properties influence reservoir output • Combine reservoir and outlet stage-storage-output relationship and continuity equation to iteratively solve for output • Check that reservoir is properly sized! • Reservoirs can alter the magnitude and timing of the hydrograph CEE 3430 – Engineering Hydrology

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