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Sudbury Aqueduct
The Sudbury Aqueduct is an aqueduct in Massachusetts. It runs for from Farm Pond at Waverly Street in Framingham to Chestnut Hill Reservoir in Boston. A later built extension runs from the original Farm Pond intake to an intake at the Stearns Reservoir (Framingham Reservoir #1) which is also connected via piping to the Bracket and Foss Reservoirs (Framingham #2 and #3.) Going east from Framingham, it runs through Sherborn before entering Natick. From Natick it runs east through Wellesley and Needham to the Charles River, which it crosses on the Echo Bridge into Newton. It ends at the Chestnut Hill Reservoir on the Newton side of the Newton-Boston line.〔(Scott Johnson, The Sudbury Aqueduct, December 16, 2004 )〕 The Massachusetts Water Resources Authority (MWRA) operates the aqueduct.
==Construction==
The Sudbury Aqueduct was constructed between 1875 and 1878, and was in use for almost 100 years. It was designed to carry water from the watershed of the Sudbury River to Boston and its surrounding communities. Reservoirs in Framingham and Southborough were constructed to impound this water at the time of the aqueduct's development, and additional reservoirs in Ashland and Hopkinton were constructed in the 1880s in an attempt to meet increased demand. Finally in the 1890s the Sudbury Reservoir was created in 1898, significantly increasing the amount of water available for distribution.
The aqueduct consists primarily of a horseshoe-shaped brick lining that is in diameter and high. The bricks are set in concrete atop a foundation of concrete and stone rubble. The aqueduct is covered by an arch built of brick. The aqueduct was initially designed to carry 80 million gallons of water per day, limited by the Rosemary Brook Siphon. An additional barrel was later added to the Rosemary Brook Siphon increasing the design capacity to 110 mgd. The main conduit from Farm Pond to Chestnut Hill Reservoir is inclined one foot per mile. At a number of places on the aqueduct small buildings were built to house control equipment of various sorts. These include a gate house at Farm Pond (abandoned after a channel was constructed feeding the aqueduct from Framingham Reservoirs #1-3 due to poor water quality at Farm Pond), a metering house in southeastern Framingham, and control houses over weirs where the aqueduct crosses over other bodies of water. These control points allow water from the aqueduct to be diverted into the watersheds it crosses. There are also control houses on either end of the Rosemary Brook siphon in Wellesley, where the water is sent through cast iron pipes to traverse an extended low spot on the route. This stretch of the aqueduct illustrates a number of the techniques used in its construction: parts of the aqueduct here are raised on an embankment, while others are in a cut, due to significant changes in local topography. Portions of the aqueduct in Natick and Newton were created by tunneling, the longest being a tunnel in Newton. In addition to the Echo Bridge, the aqueduct also passes over the "Waban Arches" bridge. Located in Wellesley near the Elm Bank Reservation, this nine-arch bridge carries the aqueduct across a valley containing Waban Brook near its mouth at the Charles River. The aqueduct formally ends at a terminal house just above the Chestnut Hill Reservoir in Newton.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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