. Engineering and Contracting . Section of Siphon Spillway Indicating General Design of Units. selmo, Fairfax, San Quentiu, Ross, Kentfield and Sausalito,all within the Marin Municipal Water District. A preliminary description of this project was published inEnpineering and Contractin?. of Dec. 22, 1915. The dam was completed during the latter part of 191S. Itis a concrete structure, of gravity section, curved in plan,320 ft. long, at the crest, and 100 ft. high, with a roadwayon top. carrying the county highway across the canon. Elevation and Plan of Alpine D it was deemed advisable to provid
. Engineering and Contracting . Section of Siphon Spillway Indicating General Design of Units. selmo, Fairfax, San Quentiu, Ross, Kentfield and Sausalito,all within the Marin Municipal Water District. A preliminary description of this project was published inEnpineering and Contractin?. of Dec. 22, 1915. The dam was completed during the latter part of 191S. Itis a concrete structure, of gravity section, curved in plan,320 ft. long, at the crest, and 100 ft. high, with a roadwayon top. carrying the county highway across the canon. Elevation and Plan of Alpine D it was deemed advisable to provide a spillway capacity ofMiOO cu. ft. per second to take care of the surplus water,and. on account of the steep, rocky sides of the canon at thedam site, this presented something of a problem. An over-flow waste weir, of sufficient capacity, must have consider-able length and. it placed at the end of the dam, would havenecessitated a large waste channel, Involving heavy rock ex-cavation. As a result of the investigations made, it was decided to (88) EnginetiiHy and Contiactiiig for April 14,1920. 423 adopt a siphon spillway, located at about the center of thedam, discharging into the natural channel below, thus avoid-ing the expense of a waste channel. Other advantages ofthis type of spillway are that it occupies but a short lengthof the dam and it limits the rtuctuation ot the water sur-face, in the reservoir, to a minimum height above the normalflow line. The spillway consists of six siphons. 3 ft. high ft. wide, e
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