Equation For Storage Coefficient Calculator

Equation For Storage Coefficient:

\[ S = \frac{2.25 \times T \times t_0}{r^2} \]

Storage Coefficient (S):

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1. What is the Storage Coefficient Equation?

The Storage Coefficient equation estimates the volume of water released from storage per unit decline in hydraulic head in an aquifer. It's a crucial parameter in hydrogeology for understanding aquifer behavior during pumping tests.

2. How Does the Calculator Work?

The calculator uses the Storage Coefficient equation:

\[ S = \frac{2.25 \times T \times t_0}{r^2} \]

Where:

\( S \) — Storage Coefficient (dimensionless)
\( T \) — Transmissivity (m²/s)
\( t_0 \) — Starting Time (seconds)
\( r \) — Distance from Pumping Well (meters)

Explanation: The equation calculates the storage coefficient based on transmissivity, starting time of the pumping test, and the distance from the pumping well.

3. Importance of Storage Coefficient Calculation

Details: The storage coefficient is essential for understanding aquifer characteristics, predicting drawdown behavior, and managing groundwater resources effectively.

4. Using the Calculator

Tips: Enter transmissivity in m²/s, starting time in seconds, and distance in meters. All values must be positive numbers greater than zero.

5. Frequently Asked Questions (FAQ)

Q1: What is the typical range of storage coefficient values?
A: Storage coefficient values typically range from 0.00001 to 0.3, depending on aquifer type and confinement.

Q2: How does storage coefficient differ for confined and unconfined aquifers?
A: Confined aquifers have smaller storage coefficients (10⁻³ to 10⁻⁵) while unconfined aquifers have larger values (0.01 to 0.3).

Q3: What factors affect the storage coefficient?
A: The storage coefficient is affected by aquifer compressibility, water compressibility, and the specific yield of the aquifer material.

Q4: When is this equation most applicable?
A: This equation is particularly useful for analyzing pumping test data in confined aquifers during the early time drawdown period.

Q5: Are there limitations to this equation?
A: The equation assumes ideal aquifer conditions and may not be accurate for complex hydrogeological settings or when boundary effects are significant.