. Cassier's magazine. provided there are no set-tlements along the shores which maycause pollution of the water. As arule, the larger the lake, the greater THE WATER SUPPLY OF COUNTRY BUILDINGS 491 the likelihood of obtaining a pure sup-ply, but even the smaller lakes, as, forinstance, those located in the moun-tains, in sparsely inhabited regions,may be kept fit for use provided astringent sanitary supervision is exer-cised. Water from surface streams may beutilised by collecting it in an artificialstorage reservoir formed by building adam across the valley of a stream (seeFigs. 7 and 8). Suc
. Cassier's magazine. provided there are no set-tlements along the shores which maycause pollution of the water. As arule, the larger the lake, the greater THE WATER SUPPLY OF COUNTRY BUILDINGS 491 the likelihood of obtaining a pure sup-ply, but even the smaller lakes, as, forinstance, those located in the moun-tains, in sparsely inhabited regions,may be kept fit for use provided astringent sanitary supervision is exer-cised. Water from surface streams may beutilised by collecting it in an artificialstorage reservoir formed by building adam across the valley of a stream (seeFigs. 7 and 8). Such impounding water supply is often beset with diffi-culties from the engineers point ofview. In many water supply problems,and in particular in the selection of anavailable source of supply, engineer-ing questions are not the only ones tobe dealt with, for legal considerations,which must be understood and re-spected, govern or affect the laws on the subject seem to varyin different countries, and there ap-. -THE ELECTRICALLY DRIVEN PUMPS FOR HOUSE AND FIRE SERVICE WERE SUPPLIED BY THEKNOWLES STEAM PUMP WORKS, NEW YORK. THE MOTORS WERE SUPPLIED BY THEGENERAL ELECTRIC CO., SCHENECTADY, N. Y. reservoirs are to be found in manymountain regions where the land maybe acquired cheaply, and where a gen-erally short dam may be constructedacross a narrow valley. It is, ofcourse, necessary that there be no set-tlements or manured fields on thedrainage area forming the water shed?of the stream; the brushwood, vege-table matter, the peatty soil formingthe bottom of the reservoir should becarefully removed; and in some casesstrict regulations should be providedfor the guarding against pollution ofthe water supply from a dammed upwater shed. Enough has been said in the fore-going to show that the problem offinding a safe and sufficient source of pears to be a sharp legal distinctionbetween waters flowing over the sur-face without a clearly marked channel,those which flow in an open
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