applying metric at idwr

Slide1: 

Applying the METRIC Evapotranspiration Model in Idaho The First Step, Not the Last Word Anthony Morse and William J. Kramber Idaho Department of Water Resources Boise, Idaho

THE FIRST STEP: 

THE FIRST STEP Prototype Applications Demonstration of Concept Existing IDWR Programs

APPLICATIONS LIST: 

APPLICATIONS LIST Modeling: ET for Setting Water Budgets Planning: ET by Land Use Class Hydrology: Aquifer Depletion Water Administration: Monitoring Water Rights Agricultural Water Use

MODELING ET for Water Budgets - The Old Way: 

MODELING ET for Water Budgets - The Old Way Water Rights Aquifer Recharge for Each Model Cell recharge = diversion + precipitation - ET Potential ETsw = acressw * crop percentage * crop coefficient Aquifer Depletion Potential ETgw = acresgw * crop percentage * crop coefficient

MODELING ET for Water Budgets - Using METRIC: 

MODELING ET for Water Budgets - Using METRIC Water Rights METRIC Output Pixel Mean by Polygon = Polygon Actual ET For Each Model Cell ET for Recharge = (Mean of Surface Water Polygon) x (Polygon Area) Depletion = (Mean of Ground Water Polygon) x (Polygon Area)

PLANNINGET by Land Cover Class: 

PLANNING ET by Land Cover Class Land Use / Land Cover 2000 ET From METRIC 2000 ET by Land Use /Land Cover Polygon How Does Water Use Change as Land Use Changes?

PLANNING ET by Land Cover Class: 

PLANNING ET by Land Cover Class   Seasonal ET 3/15/2000 to 10/15/2000

PLANNING ET by Land Cover Class: 

PLANNING ET by Land Cover Class Importance

Slide9: 

HYDROLOGY Aquifer Depletion

HYDROLOGY: 

HYDROLOGY Aquifer Depletion Wells and Water Rights Power Meter Records ~$300,000 Per Year 6-8 Month Time Lag ~5,000 – 6,000 Wells Present Method ~$50 Per Well

HYDROLOGY Aquifer Depletion: 

HYDROLOGY Aquifer Depletion Wells and Water Rights with ET Map Alternative METRIC ~5,000-6,000 Wells 1 Month Time Lag ~$7 Per Well

Slide12: 

Hydrology Aquifer Depletion Accuracy

WATER ADMINISTRATIONMonitoring Water Rights Compliance: 

WATER ADMINISTRATION Monitoring Water Rights Compliance Irrigation Without a Water Right Irrigation in Violation of the Conditions of a Right Maximum Rate of Diversion

WATER ADMINISTRATION: 

WATER ADMINISTRATION Monitoring Water Rights Compliance Irrigation Without a Water Right

WATER ADMINISTRATION Water Rights Compliance Monitoring: 

WATER ADMINISTRATION Water Rights Compliance Monitoring Selected 426 Wells/Fields Used 2 Consecutive Landsat Overpasses (17 Days) Computed 17-Day Cumulative ET (ET17) Used Maximum Diversion Rate for 17 Days (DR17) Compared 17-Day Depth (D17) with ET17 If ET17 > D17, Investigate Irrigation “in excess of the conditions of a water right”

WATER ADMINISTRATION  Water Rights Compliance Monitoring: 

WATER ADMINISTRATION Water Rights Compliance Monitoring

WATER ADMINISTRATION Water Rights Compliance Monitoring: 

WATER ADMINISTRATION Water Rights Compliance Monitoring 18 Fields Exceeded Rate Limits 15 of 18 Due to Water Right File Issues 3 Valid Positives Farmers Contacted Within 4 Weeks ANALYSIS

WATER ADMINISTRATIONAgricultural Water Use: 

WATER ADMINISTRATION Agricultural Water Use Actual – Not Potential - ET

WATER ADMINISTRATIONAgricultural Water Use: 

WATER ADMINISTRATION Agricultural Water Use 2000 9,313,505 1,437,520 790 - 1021 Alfalfa (.77) IDWR/METRIC 2002 -- 1,176,516 -- Census of Agriculture 2000 -- 1,367,859 -- USGS 1997 -- 1,241,522 -- Census of Agriculture 1995 4,396,707 1,097,225 490 (807 Alfalfa) (.61) USGS 1992 -- 1,169,710 -- Census of Agriculture 1990 6,817,991 1,235,348 670 (957 Alfalfa) (.70) USGS/IDWR 1987 -- 1,146,018 -- Census of Agriculture

WATER ADMINISTRATIONAgricultural Water Use: 

WATER ADMINISTRATION Agricultural Water Use Year 2000 (METRIC) Results are Higher Irrigated Acres Water Use Generalizing Effects of LU/LC (Area) Different Methods (ET) Different Start and End Dates (ET)

DIFFERENT DATES: 

DIFFERENT DATES Blaney-Criddle (1990 Estimate) Start: Emergence (April-June) End: Harvest (September-October) METRIC Start: March 1, 2000 End October 31, 2000

DIFFERENT DATES: 

DIFFERENT DATES April 8, 2000 October 16, 2000

SUMMARYET from an Energy Balance Model: 

SUMMARY ET from an Energy Balance Model Demonstrated Applications Modeling: ET for Setting Water Budgets Planning: ET by Land Use Class Hydrology: Aquifer Depletion Water Administration: Monitoring Water Rights Agricultural Water Use

INFORMATION: 

INFORMATION www.idwr.idaho.gov/gisdata www.kimberly.uidaho.edu/water/metric/