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

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 Research Scientist Regulator ET Application Developer
Examples  Irrigation/Water Rights Enforcement  Irrigation/ Water Rights Administration  Species Protection Note: ET Slides developed by Tony Morse and Dr. Rick Allen
Why Quantify ET? Net Depletion from Ground-water Pumping in Idaho is largely unmeasured IWRRI Ground Water Connections Conference, Sept 24, 2008, Boise, Yellow dots are irrigation wells ID
8/1/2009 8/11/2009
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.
Legal Finding of Fact Polygons of fields claimed to be water-short in 2006.
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?
The Answer Use Landsat to map 2006 evapotranspiration Purple polygons are fields claimed to be water-short in 2006
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
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
Lemhi River, Idaho – Water Rights Landsat 7/21/2000
April
May
June
July
August
September
Seasonal
Conclusion  ET computations provide a powerful tool  Applications are just beginning  This is valuable and important work – full speed ahead!
208-378-1513 Website: Idahowaterengineering.com Email: info@idahowaterengineering.com

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