. American engineer and railroad journal . am itself is 1,172 ft. in length, from ihe rock on oneside of the valley to ihat on the other It is 161 ft. highin ihe center trom Ihe foundalion to the parapet of Iheroadway crossing 11. The height from the river-bed is loift. to the parapet and 84 ft. to the sill over which ihe over-flow passes—that is, between the arches supporting theroadway. The greatest thickness of the dam at the baseis 120 ft. and the width of the roadway on top is 19 ft. 10in. The b ilter of the front or water-face of the clam is Ihorizontal in 7 27 vertical ; the slope of th
. American engineer and railroad journal . am itself is 1,172 ft. in length, from ihe rock on oneside of the valley to ihat on the other It is 161 ft. highin ihe center trom Ihe foundalion to the parapet of Iheroadway crossing 11. The height from the river-bed is loift. to the parapet and 84 ft. to the sill over which ihe over-flow passes—that is, between the arches supporting theroadway. The greatest thickness of the dam at the baseis 120 ft. and the width of the roadway on top is 19 ft. 10in. The b ilter of the front or water-face of the clam is Ihorizontal in 7 27 vertical ; the slope of the back of thedam above ground level is i in A general view of the dam is given herewith, whichgives an excellent idea of its appearance and the sur-roundings of the lake. A cross-section of the dam is alsogiven. Water is drawn off to the aqueduct through a towerplaced at the side of the lake, and provided with special pool Town Hall. It is designed thioughout for three linesof pipes having a total capacity of ,000 gallons per. SECTION OF VYRNWY day ; but at present only one of these lines is laid, carry-ing 13,333,000 gallons. The aqueduct commences with the Hirnanl miles long, at the outlet of which the water enters Vol No. .,.] ENGINEERING JOURNAL. 419 the pipes, which are carried underground for seven miles,except for a short distance, across ihe Alon, where llieyare carried over a bridge. The other streams on this sec-tion are passed l)y inverted syphons. This section endsat the Parc-Uchaf balancing reservoir, which is on a hillrising nearly to the hydrauhc grade. From this point follow mdes of pipe; then theCyninion Tunnel, o 875 mile, a bridge over a narrow val-ley and the Tunnel aliout a mde long. Thelatter discharges into the Oswestry balancmg reservoir,which is the largest on the line. The local conditionsbeing favorable, this was made also a storage reservoir,where a siip[)ly of 2,000 gallons is held to prov
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Keywords: ., bookcentury1800, bookdecade1890, booksubjectrailroadengineering
