. A treatise on hygiene and public health . ^ ^ Fig. 10. river can make up any deficiency caused by removal of the ground-water,by filtering through the bank and bed of the river. For these reasons, the locality most commonly chosen is on the bankof a running stream in a deposit of gravel. The simplest form of collect-ing-works is the open basin; but in an open basin the water is exposed tothe direct rays of the sun, and, in summer, becomes heated above itsnatural temperature; this favors vegetable growth, and in some placesinconvenience has arisen from this ca
. A treatise on hygiene and public health . ^ ^ Fig. 10. river can make up any deficiency caused by removal of the ground-water,by filtering through the bank and bed of the river. For these reasons, the locality most commonly chosen is on the bankof a running stream in a deposit of gravel. The simplest form of collect-ing-works is the open basin; but in an open basin the water is exposed tothe direct rays of the sun, and, in summer, becomes heated above itsnatural temperature; this favors vegetable growth, and in some placesinconvenience has arisen from this cause. It is unquestionably better,and in warm climates it is essential, to have the basins covered. Another method of utilizing the ground-water is to construct a coveredgallery which shall permit the percolation of water into it, and from whichthe water can flow to the pump-well; for, as is indeed ordinarily the case,. Fig. 11.—Filter-gallery, Lowell, Mass. when the supply is taken from rivers, pumping-works are almost alwaysa necessary part of such a scheme. There are many examples of collect-ing-galleries in Europe and in this country. A single example will sufficefor illustration. The accompanying cut, taken by permission from Fan-
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Keywords: ., bookcentury1800, bookdecade1870, booksubjecthygiene, bookyear1879
