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<br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br /> <br />20 <br /> <br />Boat Chute Design Flow <br />The range of flow in the South platte River varies widely from season to <br />season, and year to year. <br /> <br />Table 5 provides river discharge data for the 1972-1981 ten year period at <br />Littleton. While the annual average is 210 cfs, the months of May - <br />September (boating season) average discharge is 394 cfs with a range from <br />91 cfs to 687 cfs. <br /> <br />The 1982-1984 wetter period for the South platte River is presented in <br />detail (daily) in Figures 11 through 13. These years are presented <br />independently because it was during this period that South platte Corridor <br />use expectations and design criteria for trails and boating began to change <br />towards a higher standard of use. For instance, trail design criteria <br />changed from a trail inundation criteria of 1000 cfs to 2600 cfs in 1984. <br /> <br />Table 111-10 presents summarized data for the May - September period for <br /> <br />19B2-1984. <br /> <br /> TABLE 10 <br /> 1982 - 1984 Discharge at Littleton <br /> (May - Setember) <br /> (cfs) <br />Month 1982 1983 1984 Avg <br />May 104 1855 1823 1261 <br />June 147 1967 947 1020 <br />July 236 1445 4BO 720 <br />August 435 693 1358 424 <br />September 285 114 640 346 <br />Avg 241 1215 1050 855 <br /> <br />The combined May - September boating period from 1972 to 1984 (13 years) <br />has a mean daily flow of 500 cfs (approximate). This data from Tables 5 <br />and 10 has been selected as a design guide. <br />