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

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

3. 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

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

5. Sample Area
Guadalupe Basin
Familiar
Data availability

6. 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 (?)

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

8. 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

9. Analyzing Parameters (X)
Peak Outflow: m3/s
VX = 1 m/s
0 < X < 0.5
D X = 20 %
D 3.7 %
X: 0.20
Peak Outflow: m3/s
X: 0.25
Peak Outflow: m3/s

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

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

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