Aquifer Constant Formula:
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The Aquifer Constant, also known as coefficient of transmissibility, represents the rate at which water is transmitted through a unit width of an aquifer under a unit hydraulic gradient. It is a key parameter in groundwater hydrology.
The calculator uses the aquifer constant formula:
Where:
Explanation: The formula calculates the transmissivity of an aquifer based on discharge rates and drawdown measurements from observation wells.
Details: Accurate calculation of aquifer constant is crucial for groundwater resource management, well design, contaminant transport studies, and sustainable water extraction planning.
Tips: Enter discharge in m³/s, radial distances in meters, and modified drawdown values in meters. Ensure all values are positive and the drawdown difference is not zero.
Q1: What is the difference between aquifer constant and hydraulic conductivity?
A: Aquifer constant (transmissivity) is the product of hydraulic conductivity and aquifer thickness, representing the overall transmission capacity of the aquifer.
Q2: What are typical values for aquifer constant?
A: Values range from 0.1 m²/day for clay aquifers to over 1000 m²/day for highly productive sand and gravel aquifers.
Q3: When should this calculation be used?
A: This calculation is used in pumping tests to determine the transmissivity of confined aquifers using data from observation wells.
Q4: Are there limitations to this equation?
A: This equation assumes ideal conditions: homogeneous isotropic aquifer, fully penetrating well, and steady-state flow conditions.
Q5: What is modified drawdown?
A: Modified drawdown accounts for well loss and other factors that may affect the actual drawdown measurement in observation wells.