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The formula calculates discharge (Q) using aquifer constant (T) and the difference in drawdowns (Δs) at two wells. It provides an estimation of the rate of flow of groundwater in an aquifer system.
The calculator uses the formula:
Where:
Explanation: The formula calculates the discharge rate based on the aquifer's transmissibility and the observed difference in water level drawdowns between two monitoring wells.
Details: Accurate discharge calculation is crucial for groundwater resource management, well field design, and understanding aquifer characteristics for sustainable water extraction.
Tips: Enter aquifer constant and difference in drawdowns values. Both values must be positive numbers greater than zero for accurate calculation.
Q1: What is aquifer constant (T)?
A: Aquifer constant, also known as coefficient of transmissibility, represents the rate at which water is transmitted through a unit width of aquifer under a unit hydraulic gradient.
Q2: How is difference in drawdowns measured?
A: Difference in drawdowns is measured by comparing the water level decline in two different monitoring wells over the same time period during pumping tests.
Q3: What are typical values for aquifer constant?
A: Aquifer constant values vary widely depending on aquifer material, ranging from less than 10 m²/day for clay to over 1000 m²/day for gravel aquifers.
Q4: When is this formula most applicable?
A: This formula is most applicable for confined aquifers where the assumptions of the Theis solution or similar analytical models are valid.
Q5: Are there limitations to this calculation method?
A: Yes, this method assumes ideal aquifer conditions and may not account for complex geological features, boundary effects, or time-dependent drawdown changes.