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<br />. <br /> <br />.) <br /> <br />. <br /> <br />DRAFT SOUTH PLA1TE' RIVER TRIBUTARIES HYDROLOGY REPORT <br /> <br />FOUR MILE CREEK. HORSE CREEK, WEST CREEK, AND TROUT CREEK <br /> <br />3.0 Results <br /> <br />Peak: discharges for the 10-, 25-, 50-, 100-, and 500-year recurrence intervals were <br />computed for Four Mile Creek, Horse Creek, West Creek, and Trout Creek. <br /> <br />The peak discharges for Four Mile Creek are based on the 2-hour design storm event and <br />tlle peak: discharges for Horse, West" and Trout Creeks are based on the 6-hour design <br />storm event. Table 4 summarizes the peak: discharges at each design point within the <br />study area. For a summary of peak discharges for all HEC-HMS elements (including <br />routing elements) along with the HEC-HMS output - see Appendix C. <br /> <br />Figures 3 through 7 display hydrographs for the outfall of Four Mile Creek, the outfall of <br />Horse Creek, the confluence of West and Trout Creeks, West Creek just upstream of the <br />confluence, and Trout Creek just ups1ream of the confluence. Figures 8 through 10 <br />illustrate peak flow profiles for the tributaries. <br /> <br />, Table 4 <br />Peak Flow Summary <br /> <br /> CONTRIBUTING 10-YEAR, 25-YEAR 50-YEAR 10O-YEAR SOo-YEAR <br />IHYDROLOGIC DRAINAGE PEAK PEAK PEAK PEAK PEAK <br />ELEMENT AREA DISCHAR<:.E DISCHARGE DISCHARGE DISCHARGE DISCHARGE <br /> (mf) (cfs) (cfs) (cfs) (cfs) (cfs) <br />4-MILE CREEK 2-Hour Desion Stann) <br />FDP2 5.65 56 121 179 261 449 <br />FDP1 7.40 65 141 209 306 528 <br />FC 8.35 66 143 213 312 538 <br />WEST CREEK 6-Hour Deskm Stann) <br />WDP-4 12.58 5 51 89 137 331 <br />WDP-3 30.07 80 238 354 490 1010 <br />WDP~2.1 4.62 50 118 160 206 371 <br />WDP-2 54.42 264 669 936 1240 2353 <br />WDP-1 60.09 290 726 1012 1338 2527 <br />WC 69.32 374 912 1260 1653 3078 <br />1J'ROUT CREEK 6-Hour Desian Storm) <br />TOP-6.2 6.07 4 30 51 71 178 <br />TOP-6.1 14.21 8 67 115 174 410 <br />TOP-8 11.27 7 50 84 126 292 <br />TOP-7 24.61 11 105 184 280 665 <br />TOP-6 57.51 23 240 422 647 1547 <br />TOP-5 70.56 24 268 471 736 1781 <br />TOP-4 93.73 31 344 613 947 2301 <br />TOP-3 103.28 38 390 689 1061 2559 <br />TDP-2 113.78 43 432 762 1169 2813 <br />TDP-1 125.65 60 495 858 1305 3100 <br />TC 135.04 61 507 879 1339 3185 <br />!HORSE CREEK 6-Hour Desian Storm) <br />wr-c I 204.36 414 I 1251 I 1898 I 2679 I 5728 <br />He I 214.08 I 470 I 1368 I 2050 I 2873 , 6074 <br /> <br /> <br />Page 11 <br />