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Transmissibility is most simply defined as the effective hydraulic conductivity of an aquifer or other water-bearing unit multiplied by the thickness of that unit. It represents the ability of an aquifer to transmit water throughout its entire saturated thickness.
The calculator uses the formula:
Where:
Explanation: This formula calculates transmissibility based on discharge and slope values, using the constant 2.302 and Archimedes' constant π.
Details: Accurate transmissibility calculation is crucial for groundwater flow analysis, aquifer characterization, and designing effective water extraction systems. It helps in understanding how easily water can move through subsurface materials.
Tips: Enter discharge in cubic meters per second (m³/s) and slope (dimensionless). Both values must be positive numbers greater than zero for accurate calculation.
Q1: What is the significance of the constant 2.302 in the formula?
A: The constant 2.302 is used in the conversion from natural logarithm to base-10 logarithm, which is commonly used in hydraulic calculations.
Q2: What are typical transmissibility values for different aquifer types?
A: Transmissibility values vary widely - from less than 0.1 m²/day for clay aquitards to over 1000 m²/day for highly productive sand and gravel aquifers.
Q3: How does transmissibility differ from hydraulic conductivity?
A: Hydraulic conductivity is a property of the material itself, while transmissibility is hydraulic conductivity multiplied by the saturated thickness of the aquifer.
Q4: What factors can affect transmissibility measurements?
A: Factors include aquifer thickness, grain size distribution, degree of saturation, temperature, and the presence of fractures or conduits.
Q5: When is this straight-line slope method most appropriate?
A: This method is particularly useful for analyzing pumping test data when plotting residual drawdown versus time ratio on semi-log paper produces a straight line.