This program is used to determine some of the most important hydrogeological parameters (transmissivity and storage coefficient) of unconfined, confined and semi-confined aquifers through the interpretation of well tests.

The numerous calculation methods contained in the program allow the operator to select the most suitable methods for the aquifer and for the type of test performed.

Tests are normally performed under transitory flow conditions and only, in a few cases, under stationary flow conditions; one therefore normally works with constant flow rates and only rarely with variable flow rates in steps.

WELL makes use of several methods to interpret the tests performed under transitory flow and constant rates while only a few methods are implemented for tests under stationary flows.

The methods that are available have been subdivided according to the type of aquifer; if it is not sure what type of aquifer is being examined, it is possible to use methods that utilise logarithmic diagrams that are able to give indications on the aquifer, on the basis of the type of curve that is obtained.

Artesian, water table, semi-artesian and anisotropic aquifers can be dealt with using WELL as can constant flow, constant lowering, step and upstream tests with one or several control piezometers or with a single well with reading of the results being carried out contemporaneously or at different times, under stationary or transitory regimes.

The program determines the characteristic parameters of the aquifer both through direct analytical interpretation and through automatic interpolation and the recognition of the best fit conditions through abacus principles, starting from flow tests performed on both individual wells and on well fields equipped with control piezometers.

The output of the calculations is made up of explanatory graph, which can be Cartesian, logarithmic or bi-logarithmic, depending on the chosen explanatory method.

EXAMPLES OF GRAPHIC OUTPUTS

Here are some examples of program-generated graphic outputs:

• Cartesian diagram of the data that have not yet been calculated;
• Semi-logarithmic diagram of the data that have not yet been calculated;
• Bi-logarithmic diagram of the data that have not yet been calculated;
• Diagram of the results