/ The content and distribution of nitrate in groundwater and surface water in the Karup Basin area have been investigated and analyzed. In addition to existing analyses, chemical profiles of the groundwater of the upper part of the water table sand aquifer were measured at a number of sites.The profiles indicate, in general, an upper oxidation zone with nitrate and a lower reduction zone free of nitrate. However, below plantation areas, the nitrate content in the oxidation zone is significantly low as well. The eight profiles are graphed separately, and all results are finally plotted on a single map by a graphic method that takes into consideration both the concentration and the level of the sampled water.The great variation in the nitrate content of the water from one water-supply well to another can easily be explained by plotting the values on maps using this graphing procedure, in conjunction with an examination of the nitrate zonation found in the profiles. The influence of agricultural activities is significantly related to the concentration of nitrate in surface water and groundwater under such water table conditions and circumstances as are found in the Karup Basin.
In the Egebjerg area, near Horsens, several aquifers consisting of glacial outwash material deposited in a glacial eroded buried valley in the Tertiary formation have been encountered.
The lowest of these, which is the main productive aquifer, and which has leaky artesian conditions, has been investigated. The thickness of this aquifer varies from 10-40 m. The lower confining bed consists of boulder clay or meltwater clay underlain by boulder clay. The upper confining bed, where leakage occurs, consists of meltwater clay with thickness from 0 to 5 m. The upper meltwater deposits include a sequence of interglacial lake deposits and several layers or laminae of clay, which separate this water-bearing material into more aquifers with watertable or artesian conditions. In the eastern part of the area boulder clay deposits are found at the top of the sequence.
The Theis modified non-equilibrium equation and its derived formula for the non-steady-state leaky artesian case have been used to determine aquifer properties from pumping test data. By means of Jacob's method and a logarithmic method, well characteristics are determined graphically. Barometric efficiency, reverse fluctuations, and boundary conditions are recorded and discussed.
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