Science to Sustain At-Risk Terminal Lakes Walker River Basin Project In Cooperation with the Bureau of Reclamation Legislative Committee on Public Lands.

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Presentation transcript:

Science to Sustain At-Risk Terminal Lakes Walker River Basin Project In Cooperation with the Bureau of Reclamation Legislative Committee on Public Lands March 24, 2006

Presentation Overview Problem Objectives Status of activities Plans for upcoming year

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

Walker Lake Salinity

Walker River Streamflow

Objectives Quantify streamflow in the Walker Basin Estimate evapotranspiration from the lake and vegetation Develop an improved water budget for Walker Lake Develop the capability to predict how changes in upstream irrigation practices would affect flows to Walker Lake

Activities Surface-Water (SW) network Ground-Water (GW) network Evapotranspiration (ET) network Mapping vegetation, elevation, bathymetry Preliminary streamflow analysis Web Site

SW Network –new and upgraded gages

New Stream Gages Green Ck near Bridgeport Virginia Ck near Bridgeport

Real-Time Data on Walker Lake Gage

GW Network GW sites

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

GW/SW Site LocationsWillows Above Weber Lateral 2-A Powerline Road Walker River Mouth

ET Network

Results – ET from Walker Lake

Measured ET on Walker Lake Provisional-Subject to revision

ET compared with RAWS Radiation Provisional-Subject to revision

ET vs RAWS radiation ProvisionalSubject to revision

Total ET for 2005 Water Year Total 2005 Water Year ET = 1814 mm or 6.0 ft* ProvisionalSubject to revision

Results – ET from Walker Lake ET for WY2005 was 6.0 ft*, up from previous estimates of 4.1 ft. Area of Walker Lake in June 2005 was 32,000 acres. Volume evaporated from Walker Lake in 2005 was 192,000 acre-ft*. ~ 50% increase over previous estimates. If relation between Lake ET and RAWS solar radiation holds, may be able to estimate annual ET from * ProvisionalSubject to revision

Salt Cedar site Site underwent substantial defoliation due to introduction of a biologic control agent: Salt Cedar Leaf Beetle (Diorhabda elongata) Changed characteristics and ET rate for large stand of Salt Cedar

Reduction of ET using Salt Grass 203 mm* 57 mm* This is a 22% reduction in ET* ProvisionalSubject to revision

Results – ET Summary 6.0 ft 3.5 ft 3.3 ft 2.8 ft 0.7 ft 0.4 ft ProvisionalSubject to revision

Mapping: Satellite imagery New imagery Lidar Bathymetry Side-scan sonar Bathymetry

Imagery (infrared)

Scaling up of ET Create map of ET units Extrapolate ET data to ET units to estimate total ET in basin

Bathymetry ProvisionalSubject to revision Maximum depth Spring 2005 was 82.8 ft

Tufa Mounds in Walker Lake? Side-scan sonar More GW inflow?

Effect of ET on Streamflow

StreamflowWabuska vs Schurz

Web Site Click on Data link for interactive map page

Click on Wabuska Streamgage for example of real-time data retrieval

Plans for This Year Continue to collect data – Data network is essentially in full operation Report on bathymetry of Walker Lake Classify and map vegetation Geophysics near Double Springs, river mouth, and south end of lake Install additional observation wells to refine hydrologic understanding of GW system