Discussion
The ratio of transmissivity to the coefficient of storativity of an aquifer is defined by the term ................. .
Answer: D
The ratio is the hydraulic diffusivity.
Hydraulic diffusivity is
\[ D = \frac{T}{S} \]
where T is transmissivity and S the storage coefficient. It appears in the groundwater flow equation and controls how fast a change in head, such as the drawdown from a pumping well, spreads through the aquifer.
Hydraulic conductivity is transmissivity divided by aquifer thickness, not by storativity. The hydraulic gradient is the change of head per unit distance. Hydraulic viscosity is not a standard aquifer parameter.
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