1. Hydrologic Modeling on Lower Colorado Basin Ki-Weon Seo
HEC-HMS
Hydrologic Modeling on Lower Colorado Basin
Ki-Weon Seo

2. Study Area-Lower Colorado Basin

3. Real data Nov/01/2000 ~ Nov/06/2000 (Hourly data)
4 Precipitation gages
(1) Town lake near Longhorn dam
(2) Buckners creek near muldoon
(3) Colorado river above LaGrange
(4) Colorado river at Wharton

4. Real data 3 Discharge gages (1) Onion creek at US Hwy 183
(2) Colorado river above LaGrange
(3) Colorado river at Wharton
Source
Town lake near Longhorn dam

5. Working with Project

6. Basin Model

7. Basin Model 1. Loss Rate - Initial and Constant - SCS Curve Number
2. Transform
- Snyder’s Unit Hydrograph
3. Base flow
- No base flow
4. Routing
- Lag and Muskingum

8. Basin Model

9. Basin Model

10. Meteorologic Model 1. Precipitation - Nov/01/2000 ~ Nov/06/2000
2. Evaportranspiration
- No evaportranspiration

11. Meteorologic Model

12. Discharge

13. Result Initial and Constant Loss Rate
(1) Calibrating Muskingum k and x
(2) Calibrating Initial and Constant Loss rate
SCS Curve Number
(1) Calibrating SCS CN.

14. Initial and Constant(without calibration)

15. Initial and Constant(without calibration)

16. Initial and Constant(with calibration)

17. Initial and Constant(with calibration)

18. SCS CN(with calibration)

19. SCS CN(with calibration)

20. Calibrating at Wharton
Optimization Schematic

21. Calibrating at Wharton
Objective function value

22. Calibrating at Wharton
Simulated and observed hydrographs

23. Calibrating at Wharton
Scatter graph of simulated and observed hydrographs

24. Calibrating at Wharton
Residual graph of simulated and observed hydrographs

25. Calibrating at LaGrange
Optimization Schematic

26. Calibrating at LaGrange
Objective function value

27. Calibrating at LaGrange
Simulated and observed hydrographs

28. Calibrating at LaGrange
Scatter graph of simulated and observed hydrographs

29. Calibrating at LaGrange
Residual graph of simulated and observed hydrographs

30. Discussion . SCS CN method is recommended
. We need more data for Muskingum
. Calibration at each subbasin will improve the results

31. acknowledgment
Sarah Stone
Chris Riley