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  Energy/Water Efficiency Calculator for Irrigation Systems
California Evapotranspiration Map (ETo)
Click the icon for a map of California depicting Zones of equal Reference Evapotranspiration (ETo). You can use this map to identify the correct climate Zone for your project.
Zone 1 is the Coastal Regions
Use Zone 1 for Zone 2 crops
Use Zone 4 for Zone 5 crops
Use Zone 10 for Zone 7 crops
Use Zone 13 for Zone 11 crops
Use Zone 18 for Zone 17 crops
Before (current system) After (with repairs and updates)
1 Irrigation System
2 Zone
3 Crop
4 Electrical Conductivity of water
5 Net Water use (inches)
6 Threshold
7 Required Leaching Ratio
8 Annual Rain Fall (inches)
a Effective % Rain Fall Directly
b or Effective Direct Rain Fall (inches)
Effective Rain - Inches/Seaseon
9 Irrigation System Efficiency
Acres Cropped
Conveyance Losses (acre-ft/year)
Required Gross Applied Water (acre-feet)
Cost Per Acre Feet
Annual Cost of water
Well/Water Supply
Known kWh/AF
Known TDH (Total Dynamic Head) - in feet
Known Overall Pumping Plan Efficiency - %
Well/Water Supply kWh/AF
Booster Pump
Known kWh/AF
Known TDH - ft
Overall Pumping Plant Efficiency
Booster kWh/AF
Tailwater Pump
Percent of Applied water through pump
Known kWh/AF
Known TDH - ft
Overall Pumping Efficiency - %
Tailwater kWh/AF
Total kWh/AF for Irrigation System (not counting Tailwater kWh/AF)
Applied Water - Acre - Feet/year
Annual Energy use - kWh/year
Melded Cost Per kWh
Annual Energy Cost
Annual Water Cost
Total Annual Cost
1 Irrigation System
2 Zone
3 Crop
4 Electrical Conductivity of water
5 Net Water use (inches)
6 Threshold
7 Required Leaching Ratio
8 Annual Rain Fall (inches)
a Effective % Rain Fall Directly
b or Effective Direct Rain Fall (inches)
Effective Rain - Inches/Seaseon
9 Irrigation System Efficiency
Acres Cropped
Conveyance Losses (acre-ft/year)
Required Gross Applied Water (acre-feet)
Cost Per Acre Feet
Annual Cost of water
Well/Water Supply
Known kWh/AF
Known TDH (Total Dynamic Head) - in feet
Known Overall Pumping Plan Efficiency - %
Well/Water Supply kWh/AF
Booster Pump
Known kWh/AF
Known TDH - ft
Overall Pumping Plant Efficiency
Booster kWh/AF
Tailwater Pump
Percent of Applied water through pump
Known kWh/AF
Known TDH - ft
Overall Pumping Efficiency - %
Tailwater kWh/AF
Total kWh/AF for Irrigation System (not counting Tailwater kWh/AF)
Applied Water - Acre - Feet/year
Annual Energy use - kWh/year
Melded Cost Per kWh
Annual Energy Cost
Annual Water Cost
Total Annual Cost