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Science to Sustain At-Risk Terminal Lakes The Walker Project

Science to Sustain At-Risk Terminal Lakes The Walker Project. Progress Report To Walker River Paiute Tribe. August 25, 2005 By Project Hydrologist: Kip K. Allander Project Chief: Thomas J. Lopes. Walker R. near Wabuska. Location of Walker River Basin.

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Science to Sustain At-Risk Terminal Lakes The Walker Project

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  1. Science to Sustain At-Risk Terminal Lakes The Walker Project

  2. Progress Report To Walker River Paiute Tribe August 25, 2005 By Project Hydrologist: Kip K. Allander Project Chief: Thomas J. Lopes

  3. Walker R. near Wabuska Location of Walker River Basin Walker R. at Lateral 2-A near Schurz West Walker R. near Hudson East Walker R. above Strosnider Ditch near Mason

  4. Overview • Problem • Purpose and objectives of project • Status of activities and accomplishments • Plans for upcoming year

  5. Lake-level declines of 4.1 ft/yr occur during periods when no flow enters Walker Lake from Walker River. Walker Lake Salinity Thomas, J.M., 1995, Water budget and salinity of Walker Lake, western Nevada: USGS Fact Sheet FS-115-95, 4 p.

  6. Walker River Streamflow

  7. Objectives • Better quantify streamflow in the Walker Basin • Estimate evapotranspiration losses from the lake and natural and agricultural vegetation • Develop an improved water budget for Walker Lake • Develop a model to predict how changes in upstream irrigation practices would affect flows into Walker Lake

  8. Accomplishments • Surface-Water (SW) network • Ground-Water (GW) network • Evapotranspiration (ET) network • Mapping • Web Site

  9. SW Network • SW Sites

  10. SW Network -upgrades

  11. New Stream Gages Green Ck near Bridgeport Virginia Ck near Bridgeport

  12. Real-Time Data on Walker Lake Gage

  13. Recent Daily Data on Walker Lake Gage

  14. GW Network • GW sites

  15. Ground-Water/Surface-Water Sites • Willows ET (above Weber) • Cow Camp Gage • Lateral 2-A Gage • Powerline Road • Walker River at Mouth

  16. Willows Cow Camp Lateral 2A Powerline Road Walker River Mouth GW/SW Site Locations

  17. ET Network

  18. Evapotranspiration (ET) Stations • Alfalfa (2) – Mason Valley WMA • Willow – Above Weber Reservoir • Greasewood – Southeast of Schurz • Rabbit Brush – Near Feedlot • Salt Grass – South of Feedlot • Tamarisk – South of Powerline Road • Open Water – Walker Lake

  19. Alfalfa – Mason Valley WMA

  20. Willows – Above Weber

  21. Rabbit Brush – Near Feedlot

  22. Greasewood – Southeast of Schurz

  23. Salt Grass – South of Feedlot

  24. Salt Cedar – South of Powerline Road

  25. Open Water – Walker Lake

  26. Mapping: • Satellite imagery • Lidar • Bathymetry • Side-scan sonar Bathymetry

  27. Transmit Pulse Range Canopy Ground First Return Intermediate Return Last Return Lidar Principle Returned Backscatter

  28. Walker Lake bathymetry Refined elevation/volume relations

  29. Bathymetry Maximum depth in January 2005 was 81.4 ft Provisional Data, Subject to revision

  30. Walker Lake Spring Deposits • Side-scan sonar

  31. Shipwreck (located in Gulf of Mexico) is an example of resolution of detail of side-scan sonar technique. Side-Scan Sonar • High Resolution Sonar technique • Used for detailed mapping

  32. Click on data link for interactive map page Web Site http://nevada.usgs.gov/walker/

  33. Plans for Upcoming Year • Continue to collect data – Data network is essentially in full operation • Develop elevation/volume relations for Walker Lake • Classify and map vegetation • Geophysics near Double Springs and river mouth • Obtain water level at Double Springs Well • Install additional observation wells to refine hydrologic understanding of GW system

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