2013-10-01_PERMIT FILE - C2010089A (2)

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Table 2.05.3(4) -7 -2 NHN -001 Ditch Capacity Demonstrations 10 -YR Event Flow Values Channel Properties Channel Values at Capacity Sufficient Ditch Capacity NHN -001 East SWS Peak Flow Cum Segment Flow' Cum. Segment Velocity Slope Total Depth Width ° Rough Geometry2 Channel Lining Manning's n Flow Cross Sectional Area Wetted Perimeter Hydraulic Radius Max.Flow Depth Mnimum Freeboard Ditch Flow Capacity 1 7.57 7.57 CFS 5.04 FPS 5.0% 1.87 12.00 Triangular 2:1 Sideslopes Riprap Sin 0.035 8.79 ftz 10.67 ft 0.82 1.57 ft 0.30 ft 73.29 CFS Yes 2 2.09 9.66 CFS 4.69 FPS 3.5% 2.82 15.50 Triangular 2:1 Sideslopes Riprap Sin 0.035 19.90 ftz 14.90 ft 1.34 2.52 ft 0.30 ft 191.88 CFS Yes 3 2.77 12.43 CFS 4.44 FPS 1.3% 2.44 17.00 Triangular 2:1 Sideslopes Shales and Hardpan 0.025 19.10 ft' 15.66 ft 1.22 2.14 ft 0.30 ft 147.87 CFS Yes 4 3.65 16.08 CFS 4.63 FPS 2.4% 2.95 17.68 Triangular 2:1 Sideslopes Riprap (3-in) 0.035 21.91 ftz 16.59 ft 1.32 2.65 ft 0.30 ft 173.63 CFS Yes 51 9.741 25.82 CFS 3.98 FPS 0.6%1 1.83 15.811 Triangular 2:1 Sideslopes IShal.s and Hardpanj 0.0251 14.26 ftz 14.67 ft 0.97 1.53 ft 0.30 ft 64.42 CFS Yes 61 4.49 30.31 CFS 4.82 FPS 1 0.9% 2.22 14.39 Triangular 2:1 Sideslopes Shales and Hardpan 0.025 12.51 ftz 13.04 ft 0.96 1 1.92 ft 1 0.30 ft 68.61 CFS Yes 7 4.921 35.23 CFS 6.811 FPS 4.0% 1.80 13.70 Triangular 2:1 Sideslopes Riprap (3-in) 0.035 9.78 ft 1 11.70 ft 1 0.84 1.50 ft 0.30 ft 1 73.65 CFS Yes Pond Entry 35.23 CFS 19.22 FPS 25.0 % NHN -001 West 1.50 3.00 1/2 Culvert 36" Diameter CIvP ISteel 1 0.0241 2.10 Ift2 1 3.69 ft 1 0.57 1 1.00 ft 1 0.50 ft 1 44.56 CFS Yes 1 7.64 7.64 CFS 3.95 FPS 2.6% 1.75 12.56 Triangular 2:1 Sideslopes Riprap (3-in) 0.035 9.36 ft' 22.15 ft 0.42 1.45 ft 0.30 ft 35.98 CFS Yes 2 3.07 10.71 CFS 3.88 FPS 1.0% 1.72 17.96 Trian ular 2:1 Sideslopes Shales and Hard an 0.025 11.94 ftz 15.36 ft 0.78 1.42 ft 0.30 ft 59.95 CFS Yes 3 3.07 13.78 CFS 5.36 FPS 6.5% 1.73 13.21 Trian ular 2:1 Sideslopes Riprap 6-in) 0.045 10.06ft2 11.17 ft 0.90 1.43 ft 0.30 ft 78.96 CFS Yes Pond Entry 13.78 CFS 10.01 FPS 8.8 % 1.50 3.0011/2 Culvert 36" Diameter CMP Steel 0.024 2.1 ftz 1 3.69 ft 0.57 1.00 ft 0.50 ft 26.44 CFS Yes 'Each segments cumulative flow is a sum of the appropriate subwatershed runoff and the flow from the uphill segments of the same ditch 2See Map 2.05.3(4) -8 for geometry details. Lining determination and roughness from SEDCAD tables. Figure 2.05.3(4) -7 -1 shows the standard installation detail for the geoweb product used as part of the Riprap (3 -in) install. 31f the Ditch Flow Capacity is greater than the Cumulative Segment Flow, the ditch segment has sufficient capacity. °The geometry of each ditch segment is based on the survey of said segment by WFC personnel APPENDIX 2.05.3(4) -7 PAGE - 15 - AUGUST 2013 (TR 04) 4ppro V?q' ai.Oc� 20f_�-3