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<br />.
<br />
<br />.
<br />
<br />f,,,. <co::'I'"Li1l1: t h,. l'~ak rlo'..''; "" developed for lhc 1'1"10" Kegi"" of COlo-
<br />
<br />r"do ~'<>re "scd [l]\d ",'e "$ folloHb:
<br />
<br />ther. l"N'tQJ
<br />
<br />to th~ c""~~ntr~T'1o" point and c"mbined will>
<br />
<br />theinlt'rven1ng
<br />
<br />Qso
<br />
<br />trol the 500-yeur flood.
<br />
<br />Th<' ~.1r:lcj tl" of Bir. ,Johnson Re"crvoir was l<lrl'c
<br />'l1wrefore rhc dra1nugc ar~,' behind thc dam
<br />
<br />~n(>ul\h lO ~Oll-
<br />
<br />Qle
<br />
<br />O_SJR
<br />.144 SB
<br />0.1.8Z 0.15/, /.C\
<br />"891A 58 \\
<br />1770AO.4635BO,036./
<br />5770,\0.432
<br />
<br />0.336
<br />
<br />,\
<br />
<br />r,,~(,ff .
<br />
<br />QjOO.
<br />
<br />" ~ '. ~~'c"^<'''$ to flo"'s d,""'nstrearn.
<br />c0tltributeG o,,~y conuul~ .~h.'_
<br />
<br />.
<br />Q500
<br />
<br />3'.
<br />
<br />Summary.
<br />
<br />Table 41ists pcakdischargc figur<os for the conccntration
<br />
<br />drainag~ area in square miles, and SB is the basin slope in feet per
<br />
<br />,
<br />I
<br />,
<br />!
<br />,
<br />,
<br />
<br />pointsshol<tlonplatesZ thru9.
<br />
<br />Where ClIO is the l().-year peak flow, Qso is the SO-year pe.ak flow, Qlf]n
<br />. is tho 100-year pcnk flo..,~ QS'OO is the 500-year flow in c.f .s., A is the
<br />
<br />!:Iile. Fr...quency curv,,~ were thcn obtain"d by plolting the peak flows
<br />
<br />On log-prcbability p~pcr and drawing a Curve through thc point~.
<br />
<br />31. ThelO, 2S, and IOOycar peak flows I<ere obta1ned for the urban
<br />
<br />areas by using frequoncy
<br />
<br />rai~fUl1 from TechniC91 Paper ~o. 40 by the
<br />, -
<br />
<br />Illethcd described previously. Frequency curves were thell obtained by
<br />
<br />plotting the pc~k flow$ On log-probability paper and drawing a curve
<br />
<br />through the points:
<br />
<br />32. Fordrainageare"shavin;,:bothurbanal1dnon_urbanareas,runoff
<br />
<br />hydrogr1lPhswerocrOuted1lndc,,,,binedtoobtllinIO, 25, and 100 year peak
<br />
<br />flows at designiltcd COnc>ontr<l :ion puitlt~. 'Frequency curVeS were obtained
<br />
<br />by p1ottinJ; the pc,,;' flows on log-probability paper and drawing' ~ curve
<br />
<br />.-
<br />
<br />thrc>ugh the p"i~.~n n"d "r" sh~..,,, <>1\ 1'1~t"s 17 thru 36.
<br />
<br />-14-
<br />
<br />33. 1'h"10, 2S, JOO, and SOOyc"r runoff hydrographs '.'crc routcd through
<br />
<br />Krttlc en,..\-" llLv..rsl"" Dam ~nd !\~,"nll DUc'nl!o" "nd llccrc'ltio" D~" and
<br />
<br />--13-
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