. Supplement to Spons dictionary of engineering, civil, mechanical, military, and naval. It should be borne in mind that there are two primary geological conditions upon whichthe quantity of water that may be supplied to the water-bearing strata depends; they are, theextent of superficial area presented by these deposits, by which the quantity of rain-water receivedon their surface in any given time is determined ; and the character and thickness of the strata, asby this the proportion of water that can be absorbed, and the quantity which the whole volume of. the permeable strata can transmit,
. Supplement to Spons dictionary of engineering, civil, mechanical, military, and naval. It should be borne in mind that there are two primary geological conditions upon whichthe quantity of water that may be supplied to the water-bearing strata depends; they are, theextent of superficial area presented by these deposits, by which the quantity of rain-water receivedon their surface in any given time is determined ; and the character and thickness of the strata, asby this the proportion of water that can be absorbed, and the quantity which the whole volume of. the permeable strata can transmit, is regulated. The operation of these general principles willconstantly vary in accordance with local phenomena, all of which must, in each separate case, betaken into consideration. The mere distance of hills or mountains need not discourage us from making trials ; for thewaters which fall on these higher lands readily penetrate to great depths through highly inclinedor vertical strata, or through the fissures of shattered rocks; and after flowing for a great distance. HYDEOGEOLOGY. 759 must reascend and be biouglit up again by other fissures, so as to approach the surface in the lowercountry. Here they may be concealed beneath a covering of undisturberl horizontul beds, which itmay be necessary to pierce in order to reach them. The course of water flowing underground isnot strictly analogous to that of rivers on the surface, there being, in the one case, a constant descentfrom a higher to a lower level from the source of the stream to the sea ; wher
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Keywords: ., bookcentury1800, bookdecade1870, booksubjectenginee, bookyear1879
