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<br />Ull <br /> <br />" <br /> <br />15 <br /> <br />Flood-Frequency Graph <br /> <br />Annual floods wel'e plotted with discharges as ordinates and recurrence <br />intervals as abscissas on a special form (Powell, 1943) developed for analysis <br />of flood frequencies by the theory of extreme values (Gumbel, 1945). Flood- <br />fl'cquency data for a station \\ith a long record is plotted as figure 5. A CUI've <br />drawn to fit such data presents a gr'aphical history of the flood experience at <br />a specific site and provides a means of comparison \\.ith experience at other <br />sites but is not consider'ed to be the best means fOl' evaluating future expect- <br />ancy. A regional cun-e, which is described in a subsequent section of the l'e- <br />port, is mOl'e applicable for this purpose. <br /> <br />70,000 <br /> <br /> , - - <br /> ~ <br /> < - <br />- - - <br /> - < <br /> -- <br /> - <br /> -I - <br /> L - - <br /> - - t- <br /> I - - - - <br /> -L P <br /> , - <br />- - , 0 - <br /> --- - , - - <br /> , <br /> - --, <br /> L -- - 0 <br /> , 0 <br /> , <br /> , 00 t-- <br /> . <br /> ~ - <br /> . c- - - - - - <br /> -, - - <br /> ~ -< - - <br /> <br />lJ 1.2 13 1,4l~ <br /> <br />2 <br /> <br />3 <br /> <br />4 !I 6 7 8910 <br /> <br />20 <br /> <br />30 40 50 <br /> <br />'00 <br /> <br />BO,OOO <br /> <br />o <br />z <br />o <br />u <br />t;' 60,000 <br />~ <br />w <br />"- <br /> <br />~ <br />w <br />w <br />~ <br /> <br />50,000 <br /> <br />U 40,000 <br />in <br />~ <br />u <br />z <br /> <br />lOpOD <br /> <br />w <br />" <br />~ <br />~ <br />I <br />U <br />~ <br />o <br /> <br />20,000 <br /> <br />10,000 <br /> <br />o <br />101 <br /> <br />RECURRENCE INTERVAL, IN '(EARS <br /> <br />Figure 5 .-- Frequency of annual floods, Smoky Hill River at Ellsworth, Kansas, <br /> <br />- <br />