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<br />Table 3.3 <br />Flow Rating Curves <br /> <br />Net Spill to Wonderland Creek <br />(cfs) <br /> <br />A comparison of the rating curves and the peak flow discharges indicates that Fourmile <br />Canyon Creek, west of Broadway, will convey approximately the lO-year event before spills <br />to Wonderland Creek occur. Fourmile Canyon Creek, between Broadway and 19th Street will <br />contain approximately the 2-year event before spills to Wonderland Creek occur. <br /> <br />o <br />o <br />844 <br />1,623 <br />5,476 <br /> <br />o <br />o <br />128 <br />624 <br />664 <br />1,116 <br /> <br />9th Street <br /> <br />Spill <br /> <br />Total Flow in Fourmile <br />Canyon Creek <br />(cfs) <br />Flows West of Broadway <br />o <br />794 <br />2,686 <br />3,590 <br />7,500 <br />Flows Between and 1 <br />o <br />295 <br />815 <br />1,800 <br />1,885 <br />2,716 <br /> <br />Spill <br /> <br />Spill <br /> <br />Approximate <br />Storm <br />Frequency <br /> <br />- <br /> <br />1 a-year <br />50-year <br />lOa-year <br />>SOO-vear <br /> <br />- <br /> <br />2 to S-year <br />1 a-year <br />50-year <br />lOa-year <br />>SOO-year <br /> <br />The hydrologic and hydraulic modeling effort indicates spills will occur on a regular basis; <br />however, to our knowledge, Fourmile Canyon Creek has not experienced spills to <br />Wonderland Creek in approximately the last 20 years. This observation is attributed to the <br />probabalistic nature of storm events. Fourmile Canyon Creek has not experienced a large <br />enough storm event, in the recent past, to cause spills to Wonderland Creek. <br /> <br />lOa-year discharges <br /> <br />and <br /> <br />the 50- <br /> <br /> <br />Five hundred (500) year discharges were extrapolated from <br />utilizing exceedance probability paper. <br /> <br />500- <br /> <br />3.3.5 <br /> <br />LEGEND <br /> <br />EXISTING 100- YR <br />FLOODPLAIN -----e <br /> <br />~~gTi~N c~gg; TlON <br /> <br />AREA OF S~ .LOW r / / /J <br />FLOODING <br /> <br /> <br /> <br /> <br /> <br /> <br /> <br /> <br /> <br /> <br /> <br /> <br /> <br /> <br /> <br /> <br /> <br /> <br /> <br /> <br /> <br /> <br /> <br /> <br /> <br /> <br /> <br /> <br /> <br /> <br /> <br /> <br /> <br /> <br /> <br /> <br /> <br /> <br /> <br /> <br /> <br /> <br /> <br />"~~~'~:':'1 "'.. <br /> <br /> <br />~~~:+,."' <br /> <br />3-5 <br /> <br />Figure 3-2 <br />Flow at Crestview Elementary <br /> <br />Split <br /> <br />