Nevada Water Science Center

Evapotranspiration Studies in Nevada

Contact Information

Mike Moreo
Phone: (702) 564-4625


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


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Topock Marsh AW

Site identification: 344756114331501

Study contact: Craig Westenburg

ET Data

Annual ET reported (in inches): 28.32

Study period: 1/01/03 - 12/31/03

Days recorded: 546 from 12/18/02 to 6/16/04


Measurement method: Bowen ratio

Data: Download from NWISWeb

Graph of ET data

Location information

in decimal degrees
in decimal degrees
34.7988888889 -114.554166667 460


Photo of ET site


Photo of ET site

ET Source Area

Low-to-medium-density cover of arrowweed; few saltcedar or mesquite


Study Information

This study was done to improve the accuracy of methods used to estimate phreatophytic ET. ET data were collected at three Bowen-ratio stations at Havasu National Wildlife Refuge, 2002–04. An arrowweed (AW) ET station was installed in homogeneous, low-to-medium density arrowweed.

Daily ET for the AW station, computed using modified ET coefficients, was compared to Bowen-ratio ET and had a correlation coefficient of 0.89 for 531 days (January 1, 2003–June 14, 2004), with large differences for many days. Monthly ET compared to Bowen-ratio ET for 17 months (January 2003—May 2004) had a correlation coefficient of 0.98.


Study Publication: SIR 2006-5043




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