File:The future water supply of San Francisco; a report to the Honorable the secretary of the interior and the Advisory board of engineers of the United States army (1912) (14773246625).jpg

Identifier: cu31924004975805 (find matches)
Title: The future water supply of San Francisco; a report to the Honorable the secretary of the interior and the Advisory board of engineers of the United States army
Year: 1912 (1910s)
Authors: Spring Valley water company, San Francisco
Subjects: Water-supply
Publisher: (San Francisco, Printed by the Rincon publishing company
Contributing Library: Cornell University Library
Digitizing Sponsor: MSN

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com-pute assuming n^.035. The tabulation (Table C 15) shows subdivi-sion of the ten cross sections from Station 20above the dam. It also shows the wetted peri-meter and mean hydraulic radius for each case.In determining the wetted perimeter it wasassumed that each of the four sections was sep-arated from the other by a wall. The maximum discharge of the flood of March,1911, when the water was 14.6 feet over the crestof Sunol Dam, computed by the Kutter formulaas described above and tabulated (Table C16),was 30,900 cubic feet per second. 377 ^ p lo 1 15 •;• g ^Kv ? & 4. §4;i ^ 1 ^n^.^ -^ \ i , J » \ ■ ^ § i:/i 3!t? 1 r I ^ / l\ e/ e/^ i 1 i 4! 1 1 / 1 9. j^ T/^\ / /ii 1 5 5 k \ ( ?evi \ 1 !1 j \ aa; 1 ^ § § ^ ^ ^ ^ ^ 5 r puo//oy\a/^ H oo HJ O oPi o O ?; H H <! HO < O«14 378 Oyerf/otV Chonne/ \^n),MwnChanrMik yVes^ Bank
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.^•^0^.-/4// £^/eycf//on3. Cryjhr/\5flr/ngiS Base Sfafion Area20+00 Z903 18+00 3103 16-f-OO 2587 14+00 324-7 /2+00 2973 /O+OO 3316 8+00 3516 6+00 3020 4+00 2958 2+-00 3000 1+00 2747 Cross rSechons ofy4/amec/a Creekaboye and be/ot^ for Storm of March 6<$7./9// Ph^e-C/4- AT THE HIGH WATER OP MARCH, 1911, MANY CROSS-SECTIONS OF THE STRAIGHT CHANNEL OF ALAMEDA CREEK ABOVE SUNOL DAM WERE SURVEYED. COMPUTATION FROM THESE CHECK PROF. LE CONTES RESULTS. 379 380 THE FUTURE WATER SUPPLY OF SAN FRANCISCO. Weir Formula. By utilizing the discharge factors foundabove, we may compute the discharge by existingformulae applicable to submerged weirs of thetype of Sunol Dam. The formulae which I havechosen are Blighs Formula and the MolitorFormula. It is not my purpose to discuss themerits of these formulae, but I take them asbeing perhaps a more thorough solution of theproblem than some of the more simple formulaecommonly used. Blighs Formula. In his work entitled The Practical Design ofIrrigatio

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