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<br />
<br />.
<br />
<br />ch~racte~istics of stre~s in the general region were compared,
<br />adjusted when necessary, and used for the analysis. Due to the
<br />lack of recorded stage-discharge data and difficulty In correl~
<br />ating elevations, past floods cannot be compared with the Inter_
<br />mediate Regional flood On the study reach.
<br />The maximum known floods that have ocourred ~ithin
<br />the geographical region are listed in Table 6.
<br />
<br />.
<br />
<br />Determination of Standard Prolect FlOOd
<br />Only in fare instances has a specifio streee experI_
<br />enced the largest flood that is potentially possible. Severe as
<br />the maximum known flood may have been On any given etream, it is
<br />generally accepted_that 8 larger flood ~ill eooner or later OCcur.
<br />The Corps of [ngin~~rs, in cooperation with tho Woather Bureau,
<br />has made comprehensive studies and investigations basad on the
<br />vest records of e~perienced stor~s and floods end hes evolved
<br />generalized procedures for estimating the flood potential of
<br />streams. These procedures were used in determining the Standard
<br />Projoct Flood, which is defined e~ the flood that Can be expected
<br />from the most Severe combination of meteorological and hydrow
<br />logicelcornlitionsthotisconeideredreasonablycharscteristic
<br />of the geographical area in which the drainage basin is located,
<br />e~cluding oxtremely rare combinations.
<br />SLamjard Project Flood rainfall estimates were basad
<br />on regionalized stcrm patterns developed by the U.S. Weather Bu_
<br />reeu. Averaged over the drainage area, the estimated rainfalls
<br />
<br />were calculated
<br />
<br />as 9.9 inches
<br />24 hours,
<br />
<br />in 3 hours, 15.2 inches in 6 hours,
<br />Peak discharges of the Standard
<br />
<br />,
<br />
<br />snd 17.1 inches in
<br />Project Flood'vary
<br />
<br />frOm 15,000 cubic feet per seccnd near the
<br />
<br />,
<br />
<br />upper limit of the study reach to 126,800 cubic feet per second
<br />at the confluence with the Creenhorn River. The discharges re-
<br />duce progressively as flows pBSS downstre~ below the Creenhorn
<br />River confluence, reaching 90,300 cubic feet per second at the
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