Drought Management Calculator

Plan deficit irrigation strategy using FAO yield-response model to minimize yield and revenue loss when water supply is limited.

Field size (acres)

Full-season crop ET (in)

Available water (acre-in)

Yield response factor (Ky)

Max yield (bu/acre)

Crop price ($/bu)

Water cost ($/acre-in)

System efficiency (%)

Tab to move between fields

Water supply ratio (%)

56.7

Yield reduction (%)

49.8

Full ET requirement (acre-in)2,400

ET deficit (%)43.3

Expected yield (bu/acre)100.3

Yield loss (bu/acre)99.7

Projected revenue ($)$55,183

Revenue loss ($)$54,817

Water cost ($)$5,600

Net return ($)$49,583

Water productivity (bu/acre-in)6.27

Water saved (acre-in)1,224

Marginal value of water ($/acre-in)$52.71

Net Return Full100,117.65

How to Use This Calculator

Enter Field size (acres), Full-season crop ET (in), and Available water (acre-in).
Set Yield response factor (Ky), Max yield (bu/acre), and Crop price ($/bu).
Adjust Water cost ($/acre-in), System efficiency (%) as needed.
Review Water supply ratio (%) and Yield reduction (%).
Use Full ET requirement (acre-in) and ET deficit (%) to inform your decision.

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