. The sanitation of cities. The Great Lakes receive the sewage and stormwashings from many urban surfaces, and millionsof people depend upon the lake water for drink-ing and other purposes. To improve waterfrontproperty, and prevent local nuisance, sewer out-lets are also extended outward from the shores;so that a race seems to be on between the extend-ing water intakes and the sewer outfalls. Ex-perts are employed to select locations for waterintakes, at points where prevailing winds andcurrents will not carry the polluted water fromthe city streets and sewers. In some places, thecry goes up
. The sanitation of cities. The Great Lakes receive the sewage and stormwashings from many urban surfaces, and millionsof people depend upon the lake water for drink-ing and other purposes. To improve waterfrontproperty, and prevent local nuisance, sewer out-lets are also extended outward from the shores;so that a race seems to be on between the extend-ing water intakes and the sewer outfalls. Ex-perts are employed to select locations for waterintakes, at points where prevailing winds andcurrents will not carry the polluted water fromthe city streets and sewers. In some places, thecry goes up that the sewage should be so com-pletely treated as to prevent all danger of pollu-tion entering the water supply, and methods oftreatment are recommended which, notwith-standing their great cost, when installed, fail to 34 Mater Supply anb IRcmoval of Sewaoe accomplish this purpose. For, as has been oftenpointed out, no method of sewage treatment af-fords a means capable of turning sewage into anacceptable drinking BALTIMORE, MARYLANDSettling or septic tanks in operation Impounding reservoirs are usually necessarywith any system of water supply other than asource derived from driven wells, or from largelakes. Storage greatly decreases the danger ofbacterial pollution, especially from pathogenicgerms; affords opportunity for suspended mat-ters to settle; and enlists the bleaching effects ofsun and air in the removal of any undesirablecolor. Its main purpose, however, is to providean adequate reserve supply; especially where thespring and fall rains are heavy and the rainfallsof the other seasons are insufTicient for the pe-riods in which they fall. 35
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