Description
Multiply nonnegative depth by targetWaterFraction-measuredWaterFraction, both in [0, 1], for signedDeficit and clip only positiveDeficit at zero.
Groundwater components relate hydraulic head, storage, porosity, and supplied flow parameters. A local equation uses a declared aquifer model; it does not establish that model from field observations.
Multiply nonnegative depth by targetWaterFraction-measuredWaterFraction, both in [0, 1], for signedDeficit and clip only positiveDeficit at zero.
When to use this tool
Use Soil Storage Deficit One Layer when you need one explicit groundwater or soil-storage component.
How to use the tool and how it works
- Enter depth, targetWaterFraction, measuredWaterFraction. Use the units and conventions below.
- Run the tool. Correct any format, range, or cross-field input error before interpreting the output.
- Read signedDeficit, positiveDeficit. Use the output convention below.
Multiply nonnegative depth by targetWaterFraction-measuredWaterFraction, both in [0, 1], for signedDeficit and clip only positiveDeficit at zero.1
| Input field | Meaning and units | Accepted input |
|---|---|---|
| depth | Depth on the length basis stated above. | Required. Finite number; minimum 0. |
| targetWaterFraction | Target Water Fraction | Required. Finite number; minimum 0; maximum 1. |
| measuredWaterFraction | Measured Water Fraction | Required. Finite number; minimum 0; maximum 1. |
| Output field | Interpretation | Returned shape |
|---|---|---|
| signedDeficit | Signed Deficit | Required. Finite number. |
| positiveDeficit | Positive Deficit | Required. Finite number. |
{
"input": {
"depth": 1,
"targetWaterFraction": 0.4,
"measuredWaterFraction": 0.25
},
"output": {
"signedDeficit": 0.15000000000000002,
"positiveDeficit": 0.15000000000000002
}
}Limitations and assumptions
- Fractions are volumetric water fractions on the same soil-volume basis; the output is water-equivalent depth, not a crop-specific irrigation recommendation.
- Inputs must satisfy both the field types and the cross-field conditions above. Invalid input causes an error; a successful false flag or documented placeholder is a different result.
- Numeric calculations use binary floating point unless exact decimal-integer arithmetic is explicitly stated. No hidden measurement tolerance or decimal rounding is added; nonfinite or out-of-contract results are rejected. Numeric signed-zero results are exported as zero.
Alternative or Complementary methods
Use suitable field measurements, aquifer assumptions, and a complete groundwater analysis for resource or safety decisions.
References
Similar or alternative tools
- Specific Storage Head Change Volume
Multiply nonnegative specificStorage and aquiferVolume by signed headChange for storedWaterChange.
- Infiltration Green Ampt Driving Head
Return 1+(suctionHead+pondingHead) × moistureDeficit/cumulativeInfiltration and cumulativeInfiltration/moistureDeficit.