Water Budget Calculator

Calculate seasonal irrigation water needs using Blaney-Criddle evapotranspiration, crop coefficients, and rainfall data.

Mean temperature (°F)

Latitude (°N)

Crop coefficient (Kc)

Growing season (days)

Effective rainfall (in)

Irrigation efficiency (%)

Field area (acres)

Tab to move between fields

Seasonal crop ET (in)

30.2

Gross irrigation need (in)

32.3

Reference ET (in/day)0.24

Crop ET (in/day)0.2

Net irrigation need (in)24.2

Total water (acre-ft)26.9

Total water (gallons)8,772,674

Monthly avg (acre-in)64.6

How to Use This Calculator

Enter mean daily temperature (°F) and site latitude for the Blaney-Criddle ETo estimate.
Set the crop coefficient (Kc) for your crop and enter the growing season length in days.
Enter effective seasonal rainfall and overall irrigation system efficiency (%).
Input total irrigated area in acres.
Review Gross irrigation need (in), Total water (acre-ft), and Monthly average to plan your water supply.

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