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Calcimator

Precision Irrigation

Planning calculators for precision irrigation — estimates from industry-style inputs.

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Soil Moisture Deficit Calculator

Calculate soil moisture deficit and MAD-based irrigation triggers from sensor data, field capacity, and crop ET.

simple

Variable Rate Irrigation Calculator

Calculate VRI prescription rates by management zone based on soil AWC, crop ET demand, and pivot flow capacity.

simple

Subsurface Drip Design Calculator

Design SDI lateral layout from crop spacing, emitter specs, and peak ET to determine tape length, flow rates, and run times.

simple

Irrigation Energy Cost Calculator

Calculate pumping energy cost from Total Dynamic Head, flow rate, pump and motor efficiency, and electricity or diesel prices.

simple

Water Use Efficiency Calculator

Calculate crop water use efficiency, irrigation WUE, water productivity, and economic returns from irrigation vs. dryland farming.

simple

Irrigation Audit Calculator

Calculate Distribution Uniformity (DU) and Christiansen's CU from catch can test data to evaluate irrigation system performance.

simple

Drought Management Calculator

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

simple

Chemigation Calculator

Calculate fertigation and chemigation injection pump rates, product volumes, and costs for applying chemicals through irrigation systems.

simple

Salinity Management Calculator

Calculate leaching requirement from irrigation water EC and crop salt tolerance using FAO guidelines, plus SAR and salinity hazard assessment.

simple

Irrigation Return on Investment Calculator

Evaluate irrigation system ROI with NPV, IRR, payback period, and benefit-cost ratio from yield improvement, water savings, and energy savings.

simple