城市波士顿和附近的系统
Boston has no filter system for its supply of water and rejoices in the fact, pointing with pride to its exceeding purity. It is analyzed once every week and under some conditions oftener, but no necessity for filtration has been found, it is said, since the establishment of the vast Metropolitan system. The municipalities it serves are Arlington, Belmont, Chelsea, Everett, Lexington, Malden, Medford, Melrose, Milton, Nahant, Newton, Quincy, Revere, Somerville, Stoneham, Swampscott, Watertown and Winthrop. For the year 1919, the daily consumption was 89,652,400 gallons, an average per capita of 111 gallons. To insure the high quality of the supply on which so many are dependent, every precaution was taken in constructing the reservoirs of the system. When the Wachusett basin was made, the soil was stripped from 3,943 acres of the area to be submerged, to an average depth of one foot, and where swamp muck was found, it was covered with gravel to a depth of a foot, thus preventing any vegetable growth that might decay and lend an objectionable odor or taste to the water. From Wachusett the water is conducted through covered aqueducts for a distance of nine miles, thence for three miles through an open chamber, thence through the Sudbury reservoir and the Weston aqueduct to a terminal chamber from which it is piped to Chestnut Hill Reservoir just out of Boston, from which it goes directly into the city mains. So much of the water comes from aqueducts that it is said that only about six miles of pipe are used in conducting the water to the cities served and most of that is 60-inch pipe. In order to preserve the purity of the waters at their source, inspectors are constantly on guard throughout the valleys and hills, and .an effort now being made to induce the legislature to pass a law permitting boating and bathing on the lakes of the system is meeting with strong opposition from the State Board of Health and the heads of the Metropolitan Water District.
Greenville, Ohio, plans to improve its water supply by filtration and will soon vote on the matter.
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