Nevada Water Science Center


Evapotranspiration Studies in Nevada

Contact Information

Mike Moreo
Hydrologist
Phone: (702) 564-4625
Email:

 

Mailing Address
USGS
Nevada Water Science Center
160 N. Stephanie St.
Henderson, NV 89074

 

Nevada Water Science Center
Information

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Rogers Spring 1

Site identification: 362853116200501

Study contact: Randy Laczniak

ET Data

Annual ET reported (in inches): 23.0

Study period: 1/01/94 - 12/31/95

Days recorded: 730 from 1/01/94 to 12/31/95

 

Measurement method: Bowen ratio

Data: Download from NWISWeb

Graph of ET data

Location information

Latitude,
in decimal degrees
Longitude,
in decimal degrees
Altitude
36.4813888889 -116.334722222 2256

 

Photo of ET site

 

Photo of ET site

ET Source Area

Low-to-medium-density cover of saltgrass

 

Study Information

The study estimates ground-water discharge from the Ash Meadows area through a rigorous quantification of evapotranspiration (ET). To accomplish this objective, the study identifies areas of ongoing ground-water ET, delineates unique areas of ET defined on the basis of similarities in vegetation and soil-moisture conditions, and computes ET rates for each of the delineated areas. A classification technique using spectral-reflectance characteristics determined from satellite images recorded in 1992 identified seven unique units representing areas of ground-water ET. The total area classified encompasses about 10,350 acres dominated primarily by lush desert vegetation. Each unique area, referred to as an ET unit, generally consists of one or more assemblages of local phreatophytes. The ET units identified range from sparse grasslands to open water. Annual ET rates are computed by energy-budget methods from micrometeorological measurements made at 10 sites within six of the seven identified ET units. Micrometeorological data were collected for a minimum of 1 year at each site during 1994 through 1997. Evapotranspiration ranged from 0.6 foot per year in a sparse, dry saltgrass environment to 8.6 feet per year over open water. Ancillary data, including water levels, were collected during this same period to gain additional insight into the evapotranspiration process. Water levels measured in shallow wells showed annual declines of more than 10 feet and daily declines as high as 0.3 foot attributed to water losses associated with evapotranspiration. Mean annual ET from the Ash Meadows area is estimated at 21,000 acre-feet.

 

Study Publication: WRIR99-4079

 

 

 

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