Rainfall Runoff in the Guadalupe River Basin

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Presentation transcript:

Rainfall Runoff in the Guadalupe River Basin CE 394 K3 - GIS in Water Resources Esteban Azagra

Objectives Run HEC-PrePro and HMS programs for a sample area. Comparison of the runoff with field data. Calibration of the modeling system.

Methodology Run HEC-PrePro GIS HMS Comparison Calibration Field Data Topographic Hydrologic Topologic GIS HMS Run HEC-PrePro Comparison Calibration Parameters (X, V) Field Data

What have I done? Search for data. Run HEC-PrePro and HMS. Analysis of parameters.

Sample Area Guadalupe Basin Familiar Data availability

Data required for the Study 500 m DEM (USGS) River Reach File 1 Coverage (EPA) HUC Basin Boundaries (USGS) Stream Gage Locations (USGS) STATSGO (USDA-NRCS) Land Use/Land Cover files (USGS) Stream Flow (USGS Stations) Precipitation (?)

Working with HEC-PrePro Fill Streams “Burning in” DEM Flow dir. Flow acc. Basic Stream Network Gages, Outlets Links

Working with HEC-PrePro Vectorization Abstraction: SCS (CN) Lag-Time: SCS (Lw, S, CN, Dt) Stream Rout.: Musk.+Pure-Lag (Ls, Vs, X, n, Dt) Delineate watersheds Schematic and basin file CN Computation of the hydrologic parameters “Clipping out” HMS

Analyzing Parameters (X) Peak Outflow: 7791.8 m3/s VX = 1 m/s 0 < X < 0.5 D X = 20 % D flow @ 3.7 % X: 0.20 Peak Outflow: 7930.4 m3/s X: 0.25 Peak Outflow: 8081.2 m3/s

Analyzing Parameters (VX) Velocity: 0.8 m/s Peak Outflow: 6848.7 m3/s X = 0.2 0 < flow < 2 m/s D VX @ 20 % D flow @ 28 % Velocity: 1.0 m/s Peak Outflow: 7930.4 m3/s Velocity: 1.2 m/s Peak Outflow: 8779.7 m3/s

Analyzing Parameters (VX) Manning: V = a ´ S1/2 a = 10 P. Flow=4468 m3/s (Vm=0.55 m/s) a = 15 P. Flow=5907 m3/s (Vm=0.82 m/s) a = 20 P. Flow=7257 m3/s (Vm=1.10 m/s) Velocity: 1.2 m/s Peak Outflow: 8779.7 m3/s a = 20 (Vm = 1.1 m/s) Peak Outflow: 7257 m3/s

Future work Precipitation and stream flow data. Comparison and calibration. Watershed Lag-Time: L/V (Lw,Vw, Dt)