. Public works . ^^^^ / .■■■■.■f^^u ^SjPG J^^. :■ y*.2-^ ,y JHI >||^^ ^^^^^^l^d y,.i^-A^J^ ^ REINFORCEMENT OF ELEVATED SEWER. There were no other especial points of difficulty inthe construction of the line. Cast iron pipe was used inmany places where it might have been difficult on ac-count of mud, etc., to lay the concrete pipe. Cast ironwas use where the sewer crossed under the railroadtracks also. At the point of entrance into the filter beds, provisionis made for the construction of a sedimentation tank,should one be needed later. It has been found, how-ever, that the flow of about 5 m
. Public works . ^^^^ / .■■■■.■f^^u ^SjPG J^^. :■ y*.2-^ ,y JHI >||^^ ^^^^^^l^d y,.i^-A^J^ ^ REINFORCEMENT OF ELEVATED SEWER. There were no other especial points of difficulty inthe construction of the line. Cast iron pipe was used inmany places where it might have been difficult on ac-count of mud, etc., to lay the concrete pipe. Cast ironwas use where the sewer crossed under the railroadtracks also. At the point of entrance into the filter beds, provisionis made for the construction of a sedimentation tank,should one be needed later. It has been found, how-ever, that the flow of about 5 miles breaks up all thesewage in a thorough manner, and its consistency andappearance at the filter beds are about that of dish-water. There are twenty-six beds in all, ranged in six seriesof four each with two more at the entrance end. Thesoil in this field is excellently suited for filtration pur-poses and in the construction of the beds it was onlynecessary to grade the land to proper elevation and. shape. The filtering material is mostly sand with aslight admixture of gravel. Each bed will take care of about 150,000 gallons ofsewage per twenty-four hours, but after using for somedays, usually a couple of weeks, the beds are allowedto rest for a similar length of time. In size they are200 feet by 138 feet. There are 6 inlets to each bed, twoon each side and one at each end. Pipes 16 inches indiameter convey the sewage to the embankments be-tvyeen the beds, whence lines of 8-inch feeders lead outto the beds. A small apron of concrete is placed atthe discharge point and by means of a 45-degree bend,pointed downward, the sewage is discharged onto thisapron with some force. This tends to break up the sew-age and also insures a more uniform distribution over
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Keywords: ., bookcentury1800, bookdecade1890, bookidpublicworks3, bookyear1896
