Crop Water Use — Evapotranspiration (ET)

Log on or create an account to use our Online ETgage Tool for quick recording of and access to weekly ET (crop water use) readings.

NAWMN ETgage® project

The NAWMN ET gauge project is one part of a system for testing cutting-edge technologies and creating a network with growers, UNL Extension, NRDs, NRCS, and crop consultants, and other interested partners, that will enable the adoption of water and energy conservation practices.

The article "Nebraska Agricultural Water Management DemonstrationNetwork (NAWMDN): Integrating Research and Extension/Outreach" was published in a 2010 journal of the American Society of Agricultural and Biological Engineers. The NAWMN project started in 2005 with about 15 farmer collaborators and has expanded to over 500 collaborators.

See the 2009 survey results from NAWMN collaborators.

The ETgage® is a tool that can be used to mimic evapotranspiration (ET) rates and this information can be utilized for irrigation management. The online ETgage tool gives collaborators an easy-to-use tool for recording readings. This online tool also provides quick, easy access to readings from a specific location.

NAWMDN launched in 2005 and started with 20 growers from south central Nebraska who joined the Network as collaborators.  An online tool, ETgage®, was added in 2008 to enable participation by growers throughout Nebraska. Read more about the NAWMDN project background.

Videos on evapotranspiration gauges and sensors

  • How to Stage Crop Growth for Managing Crop Water Use (:54)
  • Assembly and Placement of an Evaportranspiration Guage (5:17)
  • How to Assemble and Prepare Watermark Sensors (2:39)
  • Installing Soil Moisture Sensors in the field (4:05)

*Videos require Flash or Quicktime player.

CropWatch: Water resources & irrigation management; cropping & reference ET

For the most up-to-date cropping information and how to successfully use regional evapotranspiration (ET) estimates, visit the CropWatch Web site. Check out the “Weather: GDD, ET” link. CropWatch is a news service of the University of Nebraska-Lincoln Extension.

Send Comments/questions for Project Leader to:

Suat Irmak
Soil & Water Resources Engineer
Univ. of Nebraska-Lincoln
Biological Systems Eng.
241 L.W. Chase Hall
Lincoln, NE 68583
Phone: (402) 472-4865

Gary Zoubek
Extension Educator
Univ. of Nebraska-Lincoln
2345 Nebraska Av.
York, NE 68467 Chase Hall
Phone: (402) 362-5508


Central Nebraska Public Power and Irrigation District (CNPPD)

Little Blue Natural Resources District

NE Network of Natural Resources Districts (NRDs)

NE Natural Resources Conservation Service (NRCS)

South Central Agricultural Laboratory (SCAL)

Upper Big Blue Natural Resources District

Full List of Project Contacts and Partners

Did you know?


UNL Offers Crop Water App

The Crop Water App was developed at the request of NAWMN participants. This app provides an easy way to estimate soil water status based on Watermark sensors installed at depths of 1, 2, and 3 feet.

With these sensor readings, the app will estimate the water used and water still available for Nebraska soils. You can also see historic sensor readings,  graph the data, and pin your GPS locations.

iOS Apple store link

Android store link