Home
Back
Aquifer Constant Formula:
| From: | To: |
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: This formula calculates the aquifer constant based on the discharge rate and the difference in drawdown between two observation wells.
Details: Accurate calculation of aquifer constant is crucial for groundwater resource assessment, well field design, and predicting the behavior of aquifers under pumping conditions.
Tips: Enter discharge in m³/s, drawdown values in meters. Ensure drawdown in well 1 is different from drawdown in well 2 for valid calculation.
Q1: What is the significance of the constant 2.72 in the formula?
A: The constant 2.72 is derived from the natural logarithm base (e) and is part of the theoretical derivation for confined aquifers.
Q2: What are typical values for aquifer constant?
A: Aquifer constant values vary widely depending on aquifer type, ranging from 0.001 m²/s for clay aquifers to over 0.1 m²/s for highly productive sand and gravel aquifers.
Q3: When should this formula be used?
A: This formula is typically used for confined aquifers with two observation wells to determine the transmissivity of the aquifer.
Q4: Are there limitations to this equation?
A: This equation assumes ideal conditions - homogeneous isotropic aquifer, fully penetrating wells, and steady-state flow conditions.
Q5: How does aquifer constant relate to hydraulic conductivity?
A: Aquifer constant (transmissivity) equals hydraulic conductivity multiplied by the saturated thickness of the aquifer.