Interpretation of Water Table Data

Water table maps consist of equipotential lines—contours of equal water table altitudes. The contours are drawn to fit measured water table altitudes, as shown in Fig. 4.4. An immediate outcome is the deduction of the dominant direction of groundwater flow (Fig. 4.4b). 

A certain degree of ambiguity or subjectivity is inherent in the compilation of water table data. The solutions are not unique. Yet, in most cases, the general picture is clear. The ambiguities are reduced as the number of measured wells increases. 

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Water table transects portray the surface altitudes (topography) and water table altitudes of wells located along a line as shown in Fig. 4.5c. The transect provides a convenient picture of the local topography, depth of groundwater, spacing of existing wells, and inferred direction of ground-water flow. 

A water table transect may be superimposed on a geological transect, providing insight into the groundwater system, as shown in Fig. 4.6. 

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Regional interpretation of water table data obtained in many wells is done in meters above sea level (masl). Each well head has to be surveyed,... 

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