Bowden-Smith, Edward Cyril · New York, D. Van Nostrand Company · leaf 167
The resultis the subsoil water leaks into the pipes when they aresubmerged, and the sewage leaks out when the subsoilwater subsides. It is almost unnecessary to state, if thesewage leaks out of the sewer in any quantity in poroussoil, the state of the ground is little better than if perco-lating… … THE SANITARY EFFICIENCY 141 question that it does not, provided the ejectors are keptworking and no head is placed on the sewers. Whenstoneware sewers are placed under an external pressureof 10-ft. head of water, it is clear that the whole circum-ference of a cracked joint will admit water; on the…
Pumping machinery
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