1. 1/40 Surface Water Hydrology at White River Lake, Texas Presented by Shane Walker May 3, 2005 CE 392K.2 – Hydrology

2. 2/40 Motivation  Water Scarcity  People Need Water Surface Water Ground Water

3. 3/40 Outline  Background Info  Model Development  Geometry  Evaporation & Usage  Results

4. 4/40 Background Information Who, Where, What, When, Why, How

5. 5/40 Who?  White River Municipal Water District  Established in 1967  Post, Crosbyton, Ralls, Spur, & White River  Services < 10,000 people

6. 6/40 Who?  White River Water Treatment Plant  Provides “Superior” drinking water to the MWD  Source: surface water from White River Lake  Average Annual effluent: 1.7 MGD  Maximum effluent: 4.5 MGD

7. 7/40 Who?  White River Lake  Constructed: 1962-1964  Inflow: White River (intermittent)  Full Elevation: 2372 ft  Full Depth: 45 ft  Full Volume: 31,846 acre-ft  Full Area: 2.5 sq. mi.

8. 8/40 Where?  White River Lake  ~ 40 mi. E of Lubbock

9. 9/40 What?  Software program to predict the usable life of the Lake  Dependent upon evaporation and usage

10. 10/40 Why?  Lake Depletion – rationing vs. alternative source?

11. 11/40 How? 1)develop mathematical model of the geometry of the lake 2)values for evaporation and usage 3)develop software to predict usable life

12. 12/40 Historical Data

13. 13/40 Historical Data

14. 14/40 Historical Data

15. 15/40 Historical Data

16. 16/40 Historical Data

17. 17/40 Historical Data

18. 18/40 Historical Data

19. 19/40 Model Development Geometry Evaporation & Usage

20. 20/40 Volume/Depth Regression Mathematical Model Of Lake Geometry

21. 21/40 Data  Volumetric Survey of White River Lake  June 30, 1993  prepared by the Hydrographic Survey Group  published by the Texas Water Developement Board  Sonar/Sounding  Surface area vs. Elevation @ 0.1 ft interval

22. 22/40 Analysis  Input data into Microsoft Excel  Used built-in regression tools  Determined accuracy of correlation by R 2

23. 23/40 Results Determined best fit as Power function V(D) = 5.3412 D 2.2933 D(V) = 0.4827 V 0.4358 (R 2 ~0.999) – Good considering siltation

24. 24/40 Evaporation & Usage Water Consumption Data

25. 25/40 Evaporation

26. 26/40 Domestic/Industrial Usage  Industrial  Oil Companies flood oil wells  Decreasing  Compare Domestic versus Industrial

27. 27/40 Total Usage (D+I)

28. 28/40 Domestic Usage

29. 29/40 Domestic/Industrial Usage

30. 30/40 Domestic/Industrial Usage

31. 31/40 Assumptions  No Infiltration (clay soils)  No precip or inflow (conservative)

32. 32/40 Lake Level Model Evaporation & Usage

33. 33/40 Lake Level Model Start Elevation – Evap – Pumpage = Final Elevation

34. 34/40 Alternative Scenarios  Case A – No change (  = 0)  Case B – Eliminate Industrial Usage  Case C – Limit plant flow  Case D – Eliminate all usage

35. 35/40 Lake Level Model  Input Data  Date  Full elevation  Current surface elevation  Lowest intake elevation  Lake bottom elevation

36. 36/40 Results

37. 37/40 Benefits  Educate planners and managers  WRMWD  Industrial will probably not be eliminated  Simulate rationing by assuming winter usage  Applied to any reservoir (water balance)

38. 38/40 Model Improvements  Change USDA evap to TWDB evap  Add Precipitation into the model  “Calibrate” the model to simulate dry spells

39. 39/40 Conclusions  Consider sustainable alternative supply

40. 40/40 Questions?