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INPUT CHANNEL K-K' SOURCE <br /> Precipitation 1 .60 in (10-yr, 24-hr) NOAA Atlas, Vol. III Colorado <br /> Drainage Area 69.64 ac. Exhibit 20-3 <br /> CN 81 Attachment 13-6 <br /> L 3450 ft. Exhibit 20-3 <br /> Y 2.96 % (weighted) Exhibit 20-3 <br /> t 0.576 hrs SEDCAD <br /> c <br /> Baseflow (ditch) 12 cfs Annual monitoring <br /> CHANNEL FACTOR CHANNEL K-K' SOURCE <br /> Q 14.11 cfs SEDCAD <br /> Z (side slopes) 5:1 Input <br /> Shape Trapezoidal Input <br /> Bottom width 12 ft Input <br /> Type Vegetated Input <br /> n 0.0715 (avg) SEDCAD <br /> Limiting Velocity 5.0 fps SEDCAD <br /> Slope 0.011 ft/foot Measured <br /> CHANNEL RESULTS Capacity Stability <br /> C D <br /> Normal Depth (dn) 0.93 ft. 0.77 ft. <br /> Flow velocity 1.65 fps 2.12 fps <br /> Channel width (top) 21.3 ft. 19.7 ft. <br /> Results <br /> The reclaimed channel will be a trapezoidal shaped channel with 5h:ly side slopes. This <br /> will insure that farm machinery will be able to traverse the reclaimed field. The <br /> velocity at 2.12 fps is well below the 5.0 fps limiting velocity. <br /> The adequacy of Culvert C-3 was reanalyzed due to the revised channel and drainage area. <br /> Based on the runoff from the 10-year, 24-hour precipitation event, the existing 24-inch <br /> diameter culvert is adequate. If the field is ever irrigated, then the culvert inlet may <br /> need to be protected due to the increased headwater. <br />