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 MV

Site identification: 344617114313401

Study contact: Craig Westenburg

ET Data

Annual ET reported (in inches): 30.12

Study period: 6/01/02 - 5/31/04

Days recorded: 756 from 5/22/02 to 6/16/04


Measurement method: Bowen ratio

Data: Download from NWISWeb

Graph of ET data

Location information

in decimal degrees
in decimal degrees
34.7713888889 -114.526111111 460


Photo of ET site


Photo of ET site

ET Source Area

Medium-density cover of mixed vegetation; screwbean, mesquite, saltcedar, salt grass, arrowweed, baccharis, sharp-leafed rush.


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. A mixed-vegetation (MV) ET station was installed in an area of medium-density phreatophytes that consist of mixed vegetation.

Daily ET for the MV station, computed using modified ET coefficients, was compared to Bowen-ratio ET and had a correlation coefficient of 0.89 for 754 days (May 23, 2002–June 14, 2004), with large differences for many days. Monthly ET compared to Bowen-ratio ET for 23 months (June 2002–May 2004; excluding March 2004) had a correlation coefficient of 0.97.


Study Publication: SIR 2006-5043




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