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<br />streams in the Arkansas River basin lampers hydrologic analyses in
<br />this area. Short periods of record from the few gages located on
<br />foothill streams and the largE. variability in physical
<br />characteristics of the basins with a' 'aLLable gage data combined to
<br />restrici: the applicability of the regression analysis. The
<br />regression analysis does, howe" ar, provide a range of
<br />reasonableness for the lOa-year di~:harge; clearly 20,000 cfs is
<br />i:oc high, and 16,000 cfs is wi thin tt at range. The new discharge-
<br />trequenc:y curve for Oak Creek at 1"lo:ence is shown on Plate 5.
<br />
<br />An attempt, was made, in the dar breach simulation model, to
<br />use dam breach parameters that repre ;;ented as critical failure as
<br />possible, such as a completely pluqge,j outlet, a full pond of water
<br />at the beginning of rainfall, and a "ull embankment heiqht breach
<br />occurring in 30 minutes. It: is ...vident tJ:om the dam breach
<br />simulation that there would be a very small increase (less than 5%
<br />for the 100-yr rainfall) in discharg", trom Oak Creek wat:ershed at:
<br />Florence if the railroad embankment upsi:ream of Rockvale '....ere to
<br />hold water and suddenly break. Accerding to the model, the peak
<br />tlo..... from the embankment failure woulj be attenuated significantly
<br />by the time it reached Florence.
<br />
<br />REFERENCE "
<br />
<br />1. Camp, Dresser, and McGee, HYjroloqic Summary .for Flood
<br />Insurance Studies of Nine Colorado Ccmm1111ities, April 1980.
<br />
<br />2. Jarrett, R. D., Flood HvdrolQqv of :~oot.hill
<br />in Colorado, Dissertation, Departnent of
<br />Colorado State University, 1981.
<br />
<br />and Mountain Streams
<br />civil Engineering,
<br />
<br />3. Jarrett, H. D., Evaluation of '~he Flood Hvdroloc!.y in the
<br />Colorado Front Ranqe usinq Prec:,}2i1:ation, Streamflow, and
<br />Paleoflood Data for the Biq Thompson Biv~r Basin, U.S. Geological
<br />Survey Water Resources Investigations Report 87-4117, 1988.
<br />
<br />4. MCCain, J.F., and Ebling, J.L., A Plan for Study. of Flood
<br />HYdroloqv of Foothill Streams in Colo~adQ, U.S.. Geological Survey
<br />Open-File Report 79-1276, September 1)79.
<br />
<br />5. McCain, J.F., and Jarrett, R.D., "anual for Estimatinq Flood
<br />Characteristics of Natural-Flow Strearn:2 in Colorado, Colorado Water
<br />Conservation Board Technical Manual Nl. 1, 1976.
<br />
<br />6. :'1ational Oceanic and Atmospheric A jministration,
<br />Frequencv Atlas of the Western U Ii t~d States,
<br />Colorado, 1973.
<br />
<br />Prec;:ipitation
<br />Volune III
<br />
<br />7. National Oceanic
<br />Maximum Precipitation
<br />
<br />and Atmospher:,c Administration, Probable
<br />Estimates IJnj, t:ed St:ates Be1;:.,een the
<br />
<br />11
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