Evapotranspiration from Landsat for IDWR Curtailment Order

Evapotranspiration from Landsat for IDWR Curtailment Order

William J. Kramber and Dr. Allan Wylie Idaho Dept of Water Resources

Dr. Richard G. AllenUniversity of Idaho

Collaborators:Dr. Jeppe Kjaersgaard, Dr. Ricardo Trezza, Clarence Robison, University of Idaho Dr. Magali Garcia, University Lapaz, BoliviaTony Morse, IDWR (retired), and Spatial Analysis Group

NASA

September 14, 2009

Why is Evapotranspiration (ET) important?

Why is Evapotranspiration (ET) important?

• ET shows the amount of water ET shows the amount of water consumed by irrigated agricultureconsumed by irrigated agriculture

• Idaho has 3.4 million acres of irrigated Idaho has 3.4 million acres of irrigated agricultureagriculture

• Irrigated agriculture accounts for over Irrigated agriculture accounts for over 90% of the water consumed in Idaho90% of the water consumed in Idaho

Water Law TermsWater Law Terms

• Water RightWater Right Authorization to use waterAuthorization to use water Includes priority dateIncludes priority date

• CallCall When a senior water right holder experiences a When a senior water right holder experiences a

water shortage they may place a callwater shortage they may place a call

• Curtailment OrderCurtailment Order Defines how the state directs junior water right Defines how the state directs junior water right

holders to stop diverting water in response to a callholders to stop diverting water in response to a call

7/31/2009

Clear Springs Foods, Inc.

Thousand Springs

8/11/2009

8/1/2009

In the pastIn the past

• Potential ET using crop coefficientsPotential ET using crop coefficients Needs crop type acres and stage of Needs crop type acres and stage of

growthgrowth Produces one ET value per countyProduces one ET value per county

In the presentIn the present

• Actual ET from Landsat using METRIC Actual ET from Landsat using METRIC No crop information requiredNo crop information required ET per pixel can be summed by fieldET per pixel can be summed by field

Landsat p40r30, 20060722

GW Model Cells and Water Rights

METRIC ET 2006 April to Oct.

METRIC ET 2006 August to Oct.

Attributes: ET by model cell and water right

ESPA GW model analysis

8/24/2009

SummarySummary

• ESPA GW model used METRIC ET dataESPA GW model used METRIC ET data For model calibrationFor model calibration To select water rights to curtailTo select water rights to curtail

• No complaints from junior users about No complaints from junior users about GW model or METRIC ET dataGW model or METRIC ET data

More InformationMore Information

www.idwr.idaho.govwww.idwr.idaho.gov

www.kimberly.uidaho.edu/water/metricwww.kimberly.uidaho.edu/water/metric

AcknowledgementsAcknowledgements

Dr. Masahiro Tasumi, University of Miyazaki, Japan

Dr. Wim Bastiaanssen, WaterWatch

Wish ListWish List

• Four Landsat satellites to collect an Four Landsat satellites to collect an image of the same area every 4 daysimage of the same area every 4 days

• Cloud and shadow algorithm or mask Cloud and shadow algorithm or mask included with imagesincluded with images

Snake River Plain

ESPA Ground Water ModelESPA Ground Water Model

• MODFLOWMODFLOW Developed by the USGSDeveloped by the USGS Perhaps the most used ground water modelPerhaps the most used ground water model

• Ground Water Flow modelGround Water Flow model Used to track the impact of various Used to track the impact of various

administrative decisionsadministrative decisions

• Calibrated to 22 years of dataCalibrated to 22 years of data 1 May 1980- 30 April 20021 May 1980- 30 April 2002 15987 observations15987 observations

For information about the Ground Water Model

For information about the Ground Water Model

Dr. Allan WylieIdaho Department of Water Resources322 East Front StPO Box 83720Boise, ID 83720-0098

Phone 208 287 4963e-mail allan.wylie@idwr.idaho.gov