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<br />. <br /> <br />10.3, states that the rainfall-runoff relation of the SCS curve number <br /> <br /> <br />method "excludes time as an explicit variable; this means that rainfall <br /> <br /> <br />intensity is ignored. If everything but storm duration or intensity is <br /> <br />the same for two storms, the estimate of runoff is the same for both <br /> <br />storms." For this reason, the discharges presented in table 6 for the <br /> <br /> <br />Cache la Poudre River tributaries at Poudre Park are generated as <br /> <br /> <br />stated above from 6-hour storms. <br /> <br /> Table 6 <br /> Cache la Poudre River Tributaries <br /> Poudre Park, Colorado <br /> Discharge-Probability Relationships <br /> Drainage Flood <br />Station Area 10-Year 50-Year 100-Year 500-Year <br /> (sq. mi.) (c.i.s.) (c.i.s.) (c.i.s.) (c.i.s. ) <br />Hewlett Gulch at <br />the Mouth 23.20 600 1,790 2,700 6,090 <br />Falls Gulch at <br />the Mouth 1.34 90 260 380 730 <br />Unnamed Trib 1,500 ft. <br />U/S from Mouth of <br />Falls Gulch 0.14 10 30 40 90 <br />Falls Gulch U/S from Con- <br />fluence with Unnamed Trib 1.15 70 220 320 630 <br />Hill Gulch at <br />the Mouth 5.57 360 1,080 1,520 2,970 <br />Watha Gulch at the Mouth 1.09 80 230 330 660 <br />Hill Gulch U/S from the <br />Confluence with Watha <br />Gulch 4.35 280 850 1,220 2,330 <br /> <br />. <br /> <br />19 <br />