NASA/USDA Workshop on Evapotranspiration ET Information for - - PowerPoint PPT Presentation

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NASA/USDA Workshop on Evapotranspiration ET Information for Irrigation, Water Rights Enforcement, and Species Protection Dave Tuthill, PhD, PE April 5, 2011 State ET Engineer Scientist ET Applications ET Application Development Team ET

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ET Information for Irrigation, Water Rights Enforcement, and Species Protection Dave Tuthill, PhD, PE

April 5, 2011

NASA/USDA Workshop on Evapotranspiration

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State Engineer ET Scientist ET Applications

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ET Application Development Team

ET Research Scientist ET Application Developer Regulator

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Examples

 Irrigation/Water Rights Enforcement  Irrigation/ Water Rights Administration  Species Protection

Note: ET Slides developed by Tony Morse and Dr. Rick Allen

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IWRRI Ground Water Connections Conference, Sept 24, 2008, Boise, ID

Why Quantify ET?

Net Depletion from Ground-water Pumping in Idaho

is largely unmeasured

Yellow dots are irrigation wells

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8/11/2009 8/1/2009

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Example 2: Legal Finding of Fact

Water ‘Call’ 12/2007 by A&B Irrigation District (surface + senior ground-water) Water Call

Claim of injury due to water shortage in 2006

caused by lowering of aquifer by junior pumpers

Demand for curtailment order to junior GW irrigators

A Curtailment Order

Issued by IDWR Has the force of law Built on Finding of Fact

At stake: >1,000 farmers’ livelihoods.

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Legal Finding of Fact

Polygons of fields claimed to be water-short in 2006.

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The Crux of the Issue

Was there enough water in 2006? How do you assess that 2 years later? How do you evaluate individual fields?

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The Answer

Use Landsat to map 2006 evapotranspiration

Purple polygons are fields claimed to be water-short in 2006

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Result

IDWR denied the call A&B appealed (and lost) Analysis based on

Unbiased data sets Single data source Field-level data Archive data

Landsat resolution (30 m) enabled the analysis

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Example 3: Water Planning for Endangered Species

Landsat-based ET estimates
Overlay irrigated areas to calculate

volumes of water used for irrigation of specific water rights

Consumptive portion compared to

diversions to help producers reduce diversions and sustain streamflows during summer for Salmon

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Landsat 7/21/2000

Lemhi River, Idaho – Water Rights

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April

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May

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June

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July

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August

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September

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Seasonal

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Conclusion

 ET computations provide a powerful

tool

 Applications are just beginning  This is valuable and important work –

full speed ahead!

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208-378-1513 Website: Idahowaterengineering.com Email: info@idahowaterengineering.com