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Transmissivity refers to the measure of how much water can be transmitted horizontally through an aquifer. It is the product of the hydraulic conductivity of the aquifer and its saturated thickness, representing the aquifer's ability to transmit water.
The calculator uses the formula:
Where:
Explanation: This formula calculates the transmissivity when flow is parallel to stratification, where equivalent permeability is considered.
Details: Transmissivity is a crucial parameter in hydrogeology for assessing aquifer productivity, designing well fields, and modeling groundwater flow. It helps determine how easily water can move through the aquifer material.
Tips: Enter equivalent permeability in m/s and aquifer thickness in meters. Both values must be positive numbers greater than zero for accurate calculation.
Q1: What is the difference between permeability and transmissivity?
A: Permeability is a property of the material itself, while transmissivity considers both the material property (permeability) and the aquifer thickness.
Q2: When is equivalent permeability used?
A: Equivalent permeability is used when flow is parallel to stratification in layered aquifers, providing a representative permeability value for the entire aquifer system.
Q3: What are typical transmissivity values for different aquifers?
A: Transmissivity values vary widely: sand and gravel aquifers (10⁻³ to 10⁻¹ m²/s), sandstone (10⁻⁵ to 10⁻³ m²/s), and fractured rock (10⁻⁷ to 10⁻³ m²/s).
Q4: How does aquifer thickness affect transmissivity?
A: Transmissivity increases linearly with aquifer thickness. Thicker aquifers generally have higher transmissivity values, assuming constant permeability.
Q5: Can this formula be used for anisotropic aquifers?
A: This formula is specifically for flow parallel to stratification. For anisotropic conditions or different flow directions, more complex calculations may be required.