File:Water Supply and Irrigation Papers of the United States Geological Survey (1902) (14586483128).jpg

Identifier: watersupplyirrig6571unit (find matches)
Title: Water Supply and Irrigation Papers of the United States Geological Survey
Year: 1902 (1900s)
Authors: United States Geological Survey
Subjects:
Publisher:
Contributing Library: Clemson University Libraries
Digitizing Sponsor: LYRASIS Members and Sloan Foundation

View Book Page: Book Viewer
About This Book: Catalog Entry
View All Images: All Images From Book
Click here to view book online to see this illustration in context in a browseable online version of this book.

Text Appearing Before Image:
oing reasonin; during the remaining five months of the year it is safe to estimatethat not less than G,000 acre-feet of water flowed past this point. be correct, and it is certainly withinthe realm of prob-ability and is theonly foundation uponwhich to base evenan approximate esti-mate, it appears tobe, and the writer be-lieves it is, perfectlysafe to rely on thisreservoir being filledannually, even duringdry years, and to counton there being, besidesj.a surplus of from18,000 to 19,000 acre-feet available for stor-age at other points,while during years ofaverage rainfall therewill certainly be amuch larger supplythan that estimated. The dam estimatedupon is of earth, of thehydraulic-fill type,the conditions beingfavorable for thatmethod of construc-tion. On either sideof the canyon is earthof a sandy loam char-acter, with a sufficientpercentage of clayeymatter to render theembankment water-tight when depositedin that manner; andthe grades from thebase of the moun-tains, a considerable
Text Appearing After Image:
Fig. 14.—Map of Boca reservon* site, in sees. 16, 21, and 28 of T.18N.,R. 17 E., M. D. M. distance back from the edge of the canyon, are ample for sluicing.By constructing from a creek on the south side of the valley aditch having a length of about 2; miles and traversing ground through TAYLOR.) LITTLE TRUCKEE RESERVOIR SITE. 65 which construction would be comparatively easy, it will be possibleto deliver at the dam, and at a considerable elevation above itscrest, whatever volume of water may be required for handling thematerial. While extremely flat slopes are not essential in an earthdam constructed by this method, to be on the side of safety the slopesallowed in the structure estimated upon are .> to 1 and 2 to 1 on theinner and outer faces, respectively. The former slope is designedto be paved with broken stone and cobbles to protect it from waveaction. The crest of the dam will be 24 feet wide and 490 feet inlength. The arrangement of the outlet works, which are designed to

Note About Images