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<br /> <br />~..,... <br /> <br />good data for such analyses. However, complications in analyses arise. <br /> <br />due to failure or partial failure of some stream gages, few hourly <br /> <br />precipitation records, and. the occurrence of snowfall at relatively <br /> <br />low elevations at times during the storm, An attempt was made to <br /> <br />obtain constant hourly retention loss rate data for this event for <br /> <br />three different subareas, but the results as listed beJowwere not <br /> <br />considered firm enough to accept for use. <br /> <br />1. Subarea C-13 including the additional drainage area from <br /> <br />Mount Carbon damsite to the Bear Creek gage at .Morrison; D.A. <br /> <br />302 sq. mi. Retention estimate, assuming no excess on May 4; <br /> <br />initial loss 0.64 inch, constant loss rate 0.10 inch per hour. <br /> <br />2. Coal Creek above gage near Plainview, D.A. 15,1 sq. mi: <br /> <br />Retention loss estimates: <br /> <br />Total storm precipitation distributed by Evergreen hourly <br />precipitation record; constant loss 0,'09 inch/hour. Precipi- <br /> <br />tation, May 5-8, distributed by Morrison hourly precipitation <br /> <br /> <br />record; initial loss 0,63 inch - hourly loss rate 0.085 inch/ <br /> <br />hour. <br /> <br />3. ~ear Creek at Morrison, assumed rain over 6l-square-mile area <br /> <br />below8QOO-foot elevation, snowfall about 8000 feet. <br />"-' <br /> <br />Runoff hydrograph recession had to be estimated. <br /> <br />Assumed net'hydrograph resulted from rain from 0900 hour <br /> <br />15 <br /> <br />.........-.........-.....~.._"'..- <br /> <br />.............. <br /> <br />'"~......._,.:,.i.~._.....- ~....,"':..;.... <br /> <br />. fir <br /> <br />-~......~ ,- ...... <br /> <br />. <br /> <br />-,; <br />