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<br /> <br />1 \'., <br /> <br />'ij,.' r. . <br /> <br />", 'J <br /> <br />economic studies,. as descri'bed;~in:>>a~agr4~.ll3:-61,;, I-I"ui'd'be Clon trOlled at <br />the dam s i te,flow f:rom'. . the UJic6~ tii'bUed) EJi!e$>.p!Ull. flow through the Sluice <br />would resil:t.tin a regulated peakd.isClh~ge. e.t,:$rin~\1.EIdQf about I, b70. <br />cubic feet .per s.eaond. . T)1e:l'l.ood",coJ/:trol, s)IQrage'Q:f'. 3.61 acre-feet is <br />ade,!-uate to control all the .f10od.s or recor4. for maxi Ilium b enefi ts. <br />Storm runoff as eomputed: ~rom the es~imatedfu.Mds of.record indiclJ,te <br />that the maximum volume o';e runoff is ie-bout 40: percent of the standard <br />project fl 0 oil, ;volume. .Th~'l4#p~dsJ.shown in table. J. are reduce~by. <br />reservoi. re~lation to r .$1oo9-s !,s $hQW in ~able 2. <br /> <br />TABIJl: 2 <br />-.,'. ---+0- <br /> <br />REGULATED PEAK DISCHARGES. <br />PINON CAi'lON 40YO,:" 19l4;50 <br /> <br />", <br /> <br />:'l,:~'tt;) of peak <br /> <br />:\.4 July 1948 ' <br />25 July 1950 <br />22 -July J.e:::: ' <br />6 August J9~3 <br />~.j,]ul;I' 19l,5 <br />26 September 1936 <br />24 July 1928 <br /> <br />...._~-- ," <br /> <br />1+-03, Spinw.~..~~s~gn flood routing. - The!1pillW.aydesign flood <br />.was routed through tho reseryoir by the inflow-storage-outflow method. <br />The reservoir wasassume.d full to spillway crest, el.ev!>tion.621;1., with <br />the outlet works considered inoperat~ve, at the beginning of the spill- <br />way design flood. . . The maxl.murn water; surfaee resul.ting from routing the <br />spillwa;y design fl~od thr~ugh the Sp~l1wa;y was elevation 6218.2,with <br />a peak discharge of 5,800 cubic feet lper second. <br /> <br />,.' j <br />4-04. Freeboard require~ents.~:With the reservo~r full to elev&- <br />---.-..._---.,_._~- ," , , <br />tion 6215, the maximum fetch is about 2,000 feet., Utilizing this fetch <br />and a ma:ximumwin4. velocity of 55. mi'J;.es per hour, a freeboar.d of 3.50 <br />feet is indice.tedby.tl1eformula giv~n in Engineer Bulletin R & H, No. <br />9, 1938 Ed 7050, dated 1 October 193$, paragraph 14 to 16 inelusive <br />(Stevenson Formula as modified by 1401-i ter and the formula of the. <br />Lorentz Zuider Zee Commission of HOlland). .,Although the drainage area <br />controlled. by the projeet is very sm$ll, it is. eonsidored desir~ble <br />to provide a minimum freeboard of 5.0 feet, since the reservoir is <br />located immediately upetream from an!urban area.. A. freeboard of 5.3 <br />feet. above the maximum:water surface lwas acl.Jpted. establishing the <br />top of the dam at elevation 6223"5. i <br /> <br />-6- <br /> <br />Appendi:x ! <br />