. Public health and preventive medicine. rmittent upward or downwardfiltration, if suitable ground and sufficient fall can be obtained, are excellentmethods of disposal, rendering the sewage innocuous, and, in some instances,taking advantage of its manurial value. These processes are considered inconnection with town sewage, and it is sufficient here to state that, for ahouse, loosely laid agricultural tiles or pipes 2 in. in diameter placed about1 ft. underground are employed. These pipes should be 6 ft. apart, theirends should rest on half-pipes as supports, ami the open joints should becove
. Public health and preventive medicine. rmittent upward or downwardfiltration, if suitable ground and sufficient fall can be obtained, are excellentmethods of disposal, rendering the sewage innocuous, and, in some instances,taking advantage of its manurial value. These processes are considered inconnection with town sewage, and it is sufficient here to state that, for ahouse, loosely laid agricultural tiles or pipes 2 in. in diameter placed about1 ft. underground are employed. These pipes should be 6 ft. apart, theirends should rest on half-pipes as supports, ami the open joints should becovered by pieces of half-pipe to prevent the entry of earth. An air ventis required for these subsoil drains. They should lie flushed by grease orHushing tanks, and may advantageously pass to a vegetable garden. Onedrawback to such a process is the chance of ill effects arising if the sewageshould become infected with enteric bacilli or cholera spirilla, while the pipesrequire cleaning and relaying once every few years. Further, there is a. Fig. 146. ^6o SANITARY ENGINEERING difficulty in securing .1 uniform distribution of the sewage. In any case thesewage musl be conveyed well away from the house in a properly laid andconstructed pipe before it passes along the subsoil pipes. If necessary, deepdrainage pipes may be laid to prevent the soil becoming swampy and gettingclogged, by facilitating removal of the purified effluent water to the neareststream or ditch. 2. Waste waters.—By waste waters are meant the effluents from baths,wash-hand basins, sinks, wash-tubs, and slop waters generally. Rain-wateralso comes under this category. A bath should be provided with a safe or tray of lead placed underneathit and tinned up at the edges. This safe should have a pipe passing from itthrough the house wall and opening free in the open air. The waste pipefrom the hath must lie 1^ to 2 in. in diameter, trapped and ventilated, and should pass through the house wallas quickly as possible and
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Keywords: ., bookcentury1900, bookdecade1900, booksubjectprevent, bookyear1902
