. Health in home and town. drive off bad odors and the settling basin, most of the sand and dirt settlesout of the water to the bottom of the basin, which has tobe cleaned occasionally. Eleven outlets drain the waterout of the settling basin into one of the eight filters. The Filters.—All of the filters together cover a largerarea than the settling basin. Each filter is a basin elevenfeet deep, built of masonry and brick, with a concreteroof overlaid with soil and grass. The following illustra-tion represents the interior of a filter ready for use, show-ing the pillars which support
. Health in home and town. drive off bad odors and the settling basin, most of the sand and dirt settlesout of the water to the bottom of the basin, which has tobe cleaned occasionally. Eleven outlets drain the waterout of the settling basin into one of the eight filters. The Filters.—All of the filters together cover a largerarea than the settling basin. Each filter is a basin elevenfeet deep, built of masonry and brick, with a concreteroof overlaid with soil and grass. The following illustra-tion represents the interior of a filter ready for use, show-ing the pillars which support the roof. The filters are THE CITY WATER AND ICE 183 filled, and the water is passed slowly through sand andgravel. Water flows from the settling basin over thefilter, and stands four feet deep while being it slowly passes down through four feet of sandand one foot of gravel. Then the pure water is collectedunderneath by pipes, and carried to a reservoir. Thediagram on the next page shows a section through. Interior of Filter a filter. The upper layer of sand filters out most ofthe coarse particles, so that the filters have to be keptclean. About once a month the upper inch of sandis scraped off, and about once a year the rest of thesand is taken out, washed, and replaced. The Pure Water.—The filtered water is stored in thereservoir until it is pumped to the large reservoir in thecity, whither it goes through the large water-mains inthe streets to all the buildings. 184 HEALTH IN HOME AND TOWN
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectsanitat, bookyear1912
