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Surface Water Hydrology at White River Lake, Texas

Surface Water Hydrology at White River Lake, Texas. Presented by Shane Walker May 3, 2005 CE 392K.2 – Hydrology. Motivation. Water Scarcity People Need Water. Ground Water. Surface Water. Outline. Background Info Model Development Geometry Evaporation & Usage Results.

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Surface Water Hydrology at White River Lake, Texas

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

  2. Motivation • Water Scarcity • People Need Water Ground Water Surface Water

  3. Outline • Background Info • Model Development • Geometry • Evaporation & Usage • Results

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

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

  6. 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. 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. Where? • White River Lake • ~ 40 mi. E of Lubbock

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

  10. Why? • Lake Depletion – rationing vs. alternative source?

  11. How? • develop mathematical model of the geometry of the lake • values for evaporation and usage • develop software to predict usable life

  12. Historical Data

  13. Historical Data

  14. Historical Data

  15. Historical Data

  16. Historical Data

  17. Historical Data

  18. Historical Data

  19. Model Development Geometry Evaporation & Usage

  20. Volume/Depth Regression Mathematical Model Of Lake Geometry

  21. 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. Analysis • Input data into Microsoft Excel • Used built-in regression tools • Determined accuracy of correlation by R2

  23. Results • Determined best fit as Power function • V(D) = 5.3412 D2.2933 • D(V) = 0.4827 V0.4358 • (R2 ~0.999) – Good considering siltation

  24. Evaporation & Usage Water Consumption Data

  25. Evaporation 6.2 ft

  26. Domestic/Industrial Usage • Industrial • Oil Companies flood oil wells • Decreasing • Compare Domestic versus Industrial

  27. Total Usage (D+I)

  28. Domestic Usage

  29. Domestic/Industrial Usage

  30. Domestic/Industrial Usage

  31. Assumptions • No Infiltration (clay soils) • No precip or inflow (conservative)

  32. Lake Level Model Evaporation & Usage

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

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

  35. Lake Level Model • Input Data • Date • Full elevation • Current surface elevation • Lowest intake elevation • Lake bottom elevation

  36. Results

  37. 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. Model Improvements • Change USDA evap to TWDB evap • Add Precipitation into the model • “Calibrate” the model to simulate dry spells

  39. Conclusions • Consider sustainable alternative supply

  40. Questions?

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