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

 

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Mesquite Flat mixed grasses

Site identification: 364419117084402

Study contact: Guy DeMeo

ET Data

Annual ET reported (in inches): 46.8

Study period: 3/19/00 - 10/04/01

Days recorded: 564 from 3/19/00 to 10/04/01

 

Measurement method: Bowen/Eddy

Data: Download from NWISWeb

Graph of ET data

Location information

Latitude,
in decimal degrees
Longitude,
in decimal degrees
Altitude
36.738611 -117.145556 127

 

Photo of ET site

 

Photo of ET site

ET Source Area

High-density cover of primarily marsh and meadow grasses, and mesquite

 

Study Information

Satellite-imagery data and results from the National Wetlands Inventory were used to identify areas with significant rates of ET on the valley floor and to delineate these areas into zones of similar vegetation and soil characteristics (known as ET units). Five unique ET units were identified: salt-encrusted playa (21,287 acres), bare-soil playa (75,922 acres), low-density vegetation (6,525 acres), moderate-density vegetation (5,019 acres), and high-density vegetation (1,522 acres). A sixth ET unit, open water, had been considered for the final results, however, with a total area of only 2 acres annual ET is estimated to be only 17 acre-ft. This estimate is less than two thousandths of the total ground-water discharge for the entire study area and is not included within the final result.

Representative ET rates for salt-encrusted playa, bare-soil playa, low-density vegetation, moderate-density vegetation, and high-density vegetation were computed by collecting micrometeorological data at instrumented sites within these ET units and solving an energy-budget equation using the Bowen ratio method. Daily ET rates were determined at each site by summing 20-minute averaged values computed with micrometeorological data sampled at intervals between 10 and 30 seconds. Annual ET rates for ET units ranged between 0.17 ft for the salt playa and 3.89 ft for dense vegetation.

 

Study Publication: WRIR03-4254

 

 

 

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