Observations and Experiments on the Fluctuations in the Level and Rate of Movement of Ground-Water on the Wisconsin Agricultural Experiment Station Farm and at Whitewater, Wisconsin
Observations and Experiments on the Fluctuations in the Level and Rate of Movement of Ground-Water on the Wisconsin Agricultural Experiment Station Farm and at Whitewater, Wisconsin
This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1892 Excerpt: ...superficial strata, it is evident thatall artesian basins experiencing any differential movement that would alter the relative height of the supply and drainage portions must tend to have established new drainage rates for them, and if the drain-? age portion of such a basin is being progressively lowered, relatively, ...
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This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1892 Excerpt: ...superficial strata, it is evident thatall artesian basins experiencing any differential movement that would alter the relative height of the supply and drainage portions must tend to have established new drainage rates for them, and if the drain-? age portion of such a basin is being progressively lowered, relatively, by any cause, while the mean percolation of rain into it remains the same, the level of the ground-water would tend to progressively decline. Then again the depression, by surface erosion, of river beds or the outlet of lakes into which the ground-water of the surrounding highlands drains, must have a tendency to increase the drainage gradient and hence to lower the level of ground-water until equilibrium is established between the drainage and the mean annual percolation. The water which percolates into the ground and again emerges from it carries away, both in solution and in mechanical suspension, large quantities of the rock constituents with which it has come in contact; and this, unless counteracted by other changes, must tend to develop an increasing porosity or widening of the passageways through which the water moves, and so to decrease the resistance to drainage and hence to lower the general level of ground-water in the region so affected. If in any considerable tract of country the mean surface consumption of water is increased by a material increase in the annual production of dry matter per acre in the form of vegetation, there must necessarily be a decrease in the total drainage from that section, and for this reason a tendency to develop a lower stage of water in the ground, and through this a drying and hardening of marsh lands such as has been referred to. When it is stated that experiments conducted in England and Germany, a...
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