. Engineering and Contracting . age water and proper disposal of all householdwaste. Connection to the pipe lines in the streets is by4-in. standard sewer pipe. All equipment, of course, passedthe Ohio Board of Health inspection. The street pipes are 6 or 8 in. in size, and take only thehouse sewage, storm water from the streets being excluded. (156) 658 Engineering and Contracting for June .9, 1920. To include the latter would have required so large pipes asto make the cost prohibitve. The lines were so located thatwherever possible the same trenches would serve both waterand sewer pipes, thu
. Engineering and Contracting . age water and proper disposal of all householdwaste. Connection to the pipe lines in the streets is by4-in. standard sewer pipe. All equipment, of course, passedthe Ohio Board of Health inspection. The street pipes are 6 or 8 in. in size, and take only thehouse sewage, storm water from the streets being excluded. (156) 658 Engineering and Contracting for June .9, 1920. To include the latter would have required so large pipes asto make the cost prohibitve. The lines were so located thatwherever possible the same trenches would serve both waterand sewer pipes, thus saving expense. The sewers were laidon a minimum grade of about 9% in. in 100 ft. For sewage treatment a standard pattern of Imhoff tankwould cost too much, largely on account of the depth neces-sary, approximating 30 ft. Rock occurring near the groundsurface, this would require expensive excavation, since thetanks must be below street sewer level, in order to receivethe sewage by gravity flow. It was for this reason that the. by building inside of them redwood partitions and sloping,floors. They were not deepened in the process, however,,the df pth from the bottom to the surface of the liquid afterthe change being only 7 ft. 9 in., as against three or moretimes that dimension in the standard Imhoff design. Nevertheless, the transformation greatly improved the con-ditions, the sludge after the change being typical dark-brown Imhoff tank sludge drying readily after its removalfrom the tanks. The conservancy tanks show a depth belowthe surface of the liquid of 9 ft., 6 in,, as against the 7 ft. 9in. at Orange, and after being in use more than a year, create-no perceptible odor even in the near neighborhood. The effluent from the various conservancy camp tanks into creeks and rivers. PLAN Fig. 2—Plan of Sedimentation Tank. design indicated in Figs. 2 and 3, was adopted. By locatingthe greater part of the sludge chamber, between the twosedimentation chambers, inst
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