Sewage disposal . iginal plant comprised 23 beds; seven new ones were added in1905, and seven more in 1908. The provision of a laboratorybuilding where the operation of the beds is controlled by frequentand regular analyses may be noted as a most important featureof the plant. At small plants, to reduce expense, such a labora-tory can also be developed, as at Brockton, into a general muni-cipal laboratory. The average area of the beds at Brockton is about one acreeach; but shape and size are varied to suit the configuration ofthe ground. A large peat hole rendered about two acres of thearea un
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Sewage disposal . iginal plant comprised 23 beds; seven new ones were added in1905, and seven more in 1908. The provision of a laboratorybuilding where the operation of the beds is controlled by frequentand regular analyses may be noted as a most important featureof the plant. At small plants, to reduce expense, such a labora-tory can also be developed, as at Brockton, into a general muni-cipal laboratory. The average area of the beds at Brockton is about one acreeach; but shape and size are varied to suit the configuration ofthe ground. A large peat hole rendered about two acres of thearea unfit for use. The beds were prepared for receiving sewageby the removal of all of the loam from the surface. The sand isstratified, but the different strata are not separated, in mostcases, by a distinct line of stratification, and the material as arule is coarse and porous. In general, the underdrains are laidabout 60 feet apart and at a depth of 7 to 9 feet. They discharge CONSTRUCTION OF INTERMITTENT FILTERS 247. NO±SV3 248 INTERMITTENT FILTRATION THROUGH SAND into main drains, varying in diameter from 8 to 15 inches, whichcarry the effluent into the Coweeset River, or into a small tribu-tary of the river. The sewage is distributed on the surface of the beds by carrierslaid across the bed from the center of one side. They are simplyflat-bottomed sluiceways reducing from a width of 5 feet at theinlet to 1 foot at the extreme end by a series of offsets of 6 incheson each side. At each offset is an opening controlled by slanting