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Distance From Pumping Well Formula:
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The Distance From Pumping Well formula calculates the distance from a pumping well to the point where the drawdown is zero in an aquifer system. This is a fundamental calculation in hydrogeology and well-field design.
The calculator uses the distance formula:
Where:
Explanation: The formula calculates the radial distance where the cone of depression intersects with the zero-drawdown boundary, based on aquifer properties and pumping duration.
Details: Calculating the distance from pumping wells is crucial for proper well-field design, preventing interference between wells, and ensuring sustainable groundwater extraction without causing excessive drawdown.
Tips: Enter transmissivity in m²/s, time in hours, and storage coefficient (dimensionless). All values must be positive numbers greater than zero.
Q1: What is transmissivity in groundwater hydrology?
A: Transmissivity is the rate at which water is transmitted through a unit width of an aquifer under a unit hydraulic gradient, typically measured in m²/s.
Q2: What does the storage coefficient represent?
A: The storage coefficient represents the volume of water released from storage per unit decline in hydraulic head in the aquifer, per unit area of the aquifer.
Q3: When is this formula typically used?
A: This formula is used in well-field design, pumping test analysis, and groundwater modeling to determine the extent of the cone of depression around pumping wells.
Q4: What are typical ranges for storage coefficient values?
A: Storage coefficient values typically range from 0.0001 to 0.001 for confined aquifers and 0.1 to 0.3 for unconfined aquifers.
Q5: How does pumping time affect the distance calculation?
A: The distance increases with the square root of pumping time, meaning longer pumping periods result in larger areas of influence around the well.