File:Annual report of the Metropolitan Water and Sewerage Board (1907) (14762922622).jpg

Identifier: annualreportofme71907mass (find matches)
Title: Annual report of the Metropolitan Water and Sewerage Board
Year: 1902 (1900s)
Authors: Massachusetts. Metropolitan Water and Sewerage Board
Subjects: Sewerage Water-supply
Publisher: Boston : Wright & Potter printing co.
Contributing Library: Boston Public Library
Digitizing Sponsor: Boston Public Library

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onnection with theaction of the wind and rain and frost, has caused a caving in ofthe steeper banks in several places along the shores, and a conse-quent retreating of the margin to the original limit of the soilstripping. In such places further cleaning and removal of the soilhave been found necessary, and for a total distance of about 4,600feet the organic material has been further removed to a width offrom 10 to 40 feet. The steep bank on the northwesterly side of the reservoir beyondthe waste-way of the dam, which had been covered with gravel, hasbeen further protected from the action of the waves by the layingof riprap for a distance of about 265 feet. On April 11 there occurred at the North Dike a slide of a portionof the material, composed of sand, gravel and riprap, which consti-tutes the facing or embankment sloping toward the reservoir. Theportion of the dike affected was about 700 feet long, where the dikeis about 80 feet high and has a thickness at the base of 1,9)30 feet.
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No. 57.) AND SEWERAGE BOARD. 7 This facing, which had been placed of varying thicknesses againstthe water-tight core of the dike, had at this point a slope of 2 hori-zontal to 1 vertical, and the water had thus far risen against it toa depth of about 42 feet. The slide did not affect the stability ofthe dike proper, but did show the importance of lengthening theslope of the outer gravel facing approximating to that which is madeby the natural action of the water. It was therefore deemed advisable in making the necessary re-pairs to reenforce the embankment against the water of the reservoir,not only at the point where the slide occurred, but in other places,by extending the original decline of 2 to 1 to a slope of 4 and 5horizontal to 1 vertical. The embankment has thus been strength-ened at five different points along the westerly portion of the dike,aggregating a length of 1,560 feet. The necessary material wastaken from the bed of the reservoir, and the rock for the ripraphas been

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