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Calculation of Hydrologic Parameters Using CRWR-PrePro

Calculation of Hydrologic Parameters Using CRWR-PrePro. Francisco Olivera, PhD Center for Research in Water Resources University of Texas at Austin. Hydrologic Parameters. Watershed Abstractions and routing method Parameters Stream Routing method Parameters.

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Calculation of Hydrologic Parameters Using CRWR-PrePro

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  1. Calculation of Hydrologic ParametersUsing CRWR-PrePro Francisco Olivera, PhD Center for Research in Water Resources University of Texas at Austin

  2. Hydrologic Parameters • Watershed • Abstractions and routing method • Parameters • Stream • Routing method • Parameters

  3. Watershed Abstractionsand Routing Method • Abstractions: precipitation/excess precipitation transformation • SCS curve number method • Initial loss + constant rate loss • Routing: excess precipitation/runoff flow transformation • Soil Conservation Service (SCS) synthetic unit hydrograph

  4. Watershed Abstractions Precipitation (mm) Excess precipitation (mm) Soil properties Excess precipitation = f(Precipitation, Soil properties)

  5. Watershed Routing Excess precipitation (mm/hr) Watershed Runoff flow (m3/s)

  6. Watershed Routing Excess precipitation (mm/hr) Excess precipitation and Runoff flow Runoff flow (m3/s) Time Runoff flow = f(Excess precipitation, Watershed hydrologic properties)

  7. Hydrologic Parameters • Watershed • Abstractions and routing method • Parameters • Stream • Routing method • Parameters

  8. Watershed Parameters • Area • Average curve number • Initial + constant rate loss • Length of longest flow-path • Slope of longest flow path • Lag time

  9. Elevation Grid

  10. Flow Length Downstream

  11. Flow Length Upstream

  12. Longest Flow-Path

  13. Flow Length Downstream to the Watershed Outlet

  14. Flow Length Downstreamto the Watershed Outlet

  15. Flow Length Upstreamto the Watershed Divide

  16. Flow Length Upstreamto the Watershed Divide

  17. Watershed Longest Flow-Path

  18. Watershed Longest Flow-Path

  19. Slope of WatershedLongest Flow Path

  20. Watershed Lag-Time (SCS) tp: lag-time (min) LW: length of longest flow-path (ft) S: slope of the longest flow-path (%) CN: average Curve Number Dt: analysis time step

  21. Watershed Lag-Time (L/V) tp: watershed lag-time (min) Lw: length of longest flow-path (ft) Vw: longest flow-path average velocity (m/s) Dt: analysis time step

  22. Watershed Parameters

  23. Hydrologic Parameters • Watershed • Abstractions and routing method • Parameters • Stream • Routing method • Parameters

  24. Routing Method

  25. Pure-Lag Method • Flow is delayed a fixed amount of time tlag. tlag: flow time in the reach I: inflow to the reach Q: outflow from the reach

  26. Muskingum Method • Flow is delayed a fixed amount of time K, and redistributed around its centroid. S: storage in the reach K: flow time in the reach (Dt < K < Dt/2X) X: storage parameter I: inflow to the reach Q: outflow from the reach Dt: analysis time step

  27. Routing Method Flow time (Ls/Vs) Ls/Vs < Dt Ls/Vs > Dt Pure LagRouting MuskingumRouting Ls: length of the stream Vs: flow velocity in the stream Dt: analysis time step

  28. Hydrologic Parameters • Watershed • Abstractions and routing method • Parameters • Stream • Routing method • Parameters

  29. Pure Lag Parameters tlag: flow time in the reach (min) Ls: reach length (m) Vs: reach average velocity (m/s)

  30. Muskingum Parameters K: flow time in the reach (hr) [Muskingum K] X: storage parameter [Muskingum X] Ls: reach length (m) Vs: reach average velocity (m/s) n: number of sub-reaches Dt: analysis time step

  31. Stream Parameters

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