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i~ <br />~~ <br />1 <br />1 <br />1 <br />i 1 <br />Table 1. Comparison of Designed and As-Built Channel. <br /> Designed <br />10-Year <br />24-Hour <br />Runoff Hankfull As-Built <br />10-Year <br />24-Hour <br />Runoff Bankfull <br />Bottom width H (ft) 5.0 5.0 30.8 30.8 <br />Side slope 4:1 4:1 2.3:1 2.3:1 <br />Depth d (ft) 3.1 4.0 4.5 7.0 <br />Area A (ft2) 193.0 2b4.0 185.2 328.3 <br />Wetted perimeter P (ft) 75.56 82.98 53.37 65.91 <br />Hydraulic radius R (ft) 2.55 3.18 3.47 4.98 <br />Channel slope S (ft/ft) 0.043 0.043 0.03 0.03 <br />Roughness coefficient n 0.045 0.045 0.045 0.045 <br />Discharge Q (cfs) 2466 3410 2427 5477 <br />Velocity V (fps) 12.78 14.H1 13.11 16.68 <br />Note: 10-year, 24-hour peak runoff is equal to 2325 cfs. <br />100-year, 24-hour peak runoff is equal to 9789 cfs. <br />