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Storage Coefficient Formula:
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The Storage Coefficient is referred as volume of water released from storage per unit decline in hydraulic head in the aquifer, per unit area of the aquifer.
The calculator uses the Storage Coefficient formula:
Where:
Explanation: This formula calculates the storage coefficient using data from distance-drawdown graphs in aquifer tests.
Details: The storage coefficient is a crucial parameter in hydrogeology that helps determine the amount of water an aquifer can release from storage when the hydraulic head is lowered. It's essential for groundwater modeling and management.
Tips: Enter transmissivity in m²/s, total drawdown in meters, and distance from pumping well to point intersection in meters. All values must be positive numbers.
Q1: What is the typical range of storage coefficient values?
A: For confined aquifers, storage coefficients typically range from 0.00005 to 0.005, while for unconfined aquifers, they range from 0.1 to 0.3.
Q2: How is transmissivity measured?
A: Transmissivity is typically determined through aquifer tests such as pumping tests, where the response of water levels to pumping is measured over time.
Q3: What does the distance rₒ represent?
A: The distance from pumping well to point intersection refers to the straight line which intersects the zero-drawdown line on a distance-drawdown graph.
Q4: When is this formula most applicable?
A: This formula is particularly useful for analyzing data from pumping tests and constructing distance-drawdown graphs to determine aquifer characteristics.
Q5: Are there limitations to this calculation method?
A: This method assumes ideal aquifer conditions and may need adjustments for complex geological settings or boundary conditions.