// multi-utility computation suite · offline · instant · precise
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│ computation suite │
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sci.soil-water-balance-FAO Calculator
Calculates the daily soil water balance: ΔSW = P + I − ET − D − RO, tracking changes in root zone moisture over the growing season. Field capacity minus permanent wilting point defines total available water (TAW) — FAO-56 recommends irrigating when soil water depletion exceeds p × TAW.
Inputs
P Mm
Reference formula or conversion factor shown for context.
Et0 Mm
Reference formula or conversion factor shown for context.
Kc
Reference formula or conversion factor shown for context.
Swc Init Mm
Reference formula or conversion factor shown for context.
Fc Mm
Maximum throughput or storage. Operating near 100% capacity typically increases failures and wait times.
Wp Mm
Reference formula or conversion factor shown for context.
Results
soil water content after (mm)
The value at the specified point or condition.
crop ET ETc (mm)
Reference formula or conversion factor shown for context.
ET deficit (mm)
Reference formula or conversion factor shown for context.
irrigation need (mm)
IRR (internal rate of return) -- the annualised return rate at which net present value equals zero. If IRR exceeds the hurdle rate, the investment adds value.