. The sanitation of cities. onsideration will reveal the inter-dependence of every part above indicated, onevery other part in the system. In fact, the rela-tion of part to part is self-evident; but there aremany qualifying circumstances that enter intothe problem, when it is examined in detail. Localconditions, a term so often used by sanitary en-gineers, supply most of the qualifying factors,and are of great importance in every instance ofactual design; but in a broad generalization suchas this study intends, average conditions only canbe considered. The portrayal of general truth isintended
. The sanitation of cities. onsideration will reveal the inter-dependence of every part above indicated, onevery other part in the system. In fact, the rela-tion of part to part is self-evident; but there aremany qualifying circumstances that enter intothe problem, when it is examined in detail. Localconditions, a term so often used by sanitary en-gineers, supply most of the qualifying factors,and are of great importance in every instance ofactual design; but in a broad generalization suchas this study intends, average conditions only canbe considered. The portrayal of general truth isintended, rather than the delineation of specificinstances. The sources of water supply have a direct re-lation to, and bearing upon, the last step in thechain: namely, sewage treatment and disposal,if it is asked to what extent water should be 24 ?Mater Suppli^ anb IRcmoval of Sewacje treated, or purified, in preparation for human con-sumption, the answer involves the further ques-tion—How impure, or polluted, is the source of. BIRMINGHAM, ENGLAND Outfall of treated sewage from treatment plant. The treated sewage from this plant is greater in volume than the ordinary flow in the river into which it is discharged and is much purer supply? If on the other hand, it is asked towhat extent sewage should be treated, the answerinvolves a reply to the question—Will the efflu-ent by any means find its way into the source of awater supply? Obviously, if a source of supply is free from alldanger of sewage pollution, it need not be treatedto remove the danger of causing diseases whichcommonly arise from this pollution. 25
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