Interpretation of the data relevant to the pumping tests.
Through these tests it is possible to calculate the main hydrodynamic parameters
of the aquifer such as the specific flow, the coefficient of
permeability, the transmissibility ad the coefficient of storage.
The test can be executed both on single wells and on testing stations.
As regards these latter, they are made up of a well, called a pilot, and one or
more piezometers which must be placed within the radius of action of the well.
W.T.A. allows considering the water flow both in steady-state and
transient-state flow conditions.
State of equilibrium flow.
It is based on a theory (by Dupuit) constructed on the hypotheses
which tend to simplify phenomenology. Out low in equilibrium-state or
steady-state flow conditions (flow changes only occur in space and not in time)
is obtained when feeding exactly compensates for the outflow.
State of Non-Equilibrium flow.
Outflow in a state of non-equilibrium flow or in transient-state flow is a
theory expounded by Theis, who considers the occurrence of flow
changes both in space and time. According to this theory, the surface of
piezometric depression around a well with a constant flow does not tend to a
stable form, but it spreads indefinitely at decreasing speed.
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