Aquifers with multiple horizontal layers with different hydraulic conductivities can be represented by the sum of the T value for each layer. The higher T of the second aquifer indicates that it can transmit more water, thus if all else is equal, it would be a better target for a water supply well. If another aquifer has a hydraulic conductivity of 50 m/d and is 300 m thick, its transmissivity is T = 15,000 m 2/d. For example, if the hydraulic conductivity of a confined aquifer is 100 m/d and the thickness is 10 m, then T is 1,000 m 2/d. Transmissivity describes the overall transmission capacity of an aquifer system, not just the properties of a small volume of the aquifer. The term transmissibility is an outdated term that is occasionally used for transmissivity. Transmissivity, the capacity of an aquifer to transmit water (L 2/T) Transmissivity is defined as the product of hydraulic conductivity, K, and saturated aquifer thickness, b, as shown in Equation 43. However, the capacity of an unconfined or confined aquifer to transmit water is described as transmissivity. When describing the transmission capacity of a small representative volume of porous media the hydraulic conductivity is used. The groundwater transmission and storage properties of geologic formations including aquifers and confining units can be described by three hydrogeologic terms: transmissivity, T specific storage, S s and storativity, S. 6.4 Properties of Aquifers and Confining Units
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