Geology Storativity Pumping Test Jacob Calculator
Jacob 2.25Tt0/r² from independently fitted late-time intercept, not thickness×specific-storage. Caller independently establishes matching units, evidence, method edition and applicability; output is not compliance, diagnosis, work-safety approval, geological identity or validated hazard prediction.
Description
Storativity describes water released from or taken into storage per unit aquifer area per unit hydraulic-head change.
Storativity describes water released from or taken into storage per unit aquifer area per unit hydraulic-head change.1
A Jacob time-intercept estimate uses transmissivity, observation distance and the fitted zero-drawdown intercept under an adopted aquifer model. Use this tool to calculate storativity pumping test jacob from the supplied measurements and assumptions.
When to use Geology Storativity Pumping Test Jacob Calculator
Use this tool to calculate storativity pumping test jacob from the supplied measurements and assumptions. Establish the measurement units, sampled interval, calibration or model edition and geological assumptions before entering data.
How to use Geology Storativity Pumping Test Jacob Calculator and understand its results
- Establish the measurement units, sampled interval, calibration or model edition and geological assumptions before entering data.
- Enter independentTransmissivityM2Second, radiusM, extrapolatedZeroDrawdownSeconds, using the field meanings and rules below, then run the tool.
- Read storativity. Interpret the fields using their units, signs and evidence conventions below.
- If input validation fails, correct the reported field and run again. Before applying the result, check reference scope, model assumptions and any missing evidence or placeholder values.
| Input field | Meaning | Value type | Requirement |
|---|---|---|---|
| independentTransmissivityM2Second | Independent transmissivity m2 second | number | Required |
| radiusM | Radius m | number | Required |
| extrapolatedZeroDrawdownSeconds | Extrapolated zero drawdown seconds | number | Required |
Require positive independently estimated transmissivity in m²/s, radius in meters and extrapolated zero-drawdown time in seconds. Calculate the Jacob intercept relation without fitting the drawdown curve. The result is dimensionless and is not capped at 1; an implausible model result requires reviewing assumptions.
S=2.25×T×t_zero/radius² Use the exact units, boundary rules, ordering and missing-evidence conventions above.
| Output field | Meaning | Value type |
|---|---|---|
| storativity | Storativity; follow the units, sign, ordering and evidence convention stated above | number |
{
"input": {
"independentTransmissivityM2Second": 2,
"radiusM": 3,
"extrapolatedZeroDrawdownSeconds": 4
},
"output": {
"storativity": 2
}
}Limitations and assumptions
A Jacob time-intercept estimate uses transmissivity, observation distance and the fitted zero-drawdown intercept under an adopted aquifer model. Interpretation depends on the units, sampling scope and exact model described above.
All listed fields require explicit values. Unexpected fields, incorrect types, nonfinite numbers and sparse evidence arrays fail validation; the specific bounds and alignment requirements are stated above. Extremely large inputs or outputs can also be rejected. An input error is distinct from a successful result reporting false, no matches or missing evidence.
Alternative or Complementary methods
Use Geology Transmissivity Pumping Test Jacob Calculator for this related task: The Cooper–Jacob straight-line approach estimates aquifer transmissivity from drawdown versus logarithmic pumping time.
Use Geology Specific Yield Gravity Drainage Calculator when its separate inputs and assumptions fit the question: Specific yield is the fraction of a bulk sample volume that drains under a defined gravity-drainage protocol.
References
Similar or alternative tools
- Geology Transmissivity Pumping Test Jacob Calculator
The Cooper–Jacob straight-line approach estimates aquifer transmissivity from drawdown versus logarithmic pumping time.
- Geology Specific Yield Gravity Drainage Calculator
Specific yield is the fraction of a bulk sample volume that drains under a defined gravity-drainage protocol.