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Home My WebLink AboutSW4220602_Design Calculations (Swales)_20220713DESIGN CALCULATIONS for NORDFAB SYSTEMS— BUILDING EXPANSION THOMASVILLE, NORTH CAROLINA DMP Project 210238 Contents: Temporary and Permanent Ditchline Calculations June 2022 Prepared by: DAMS • MARTIN • POWELL ENGINEERS & SURVEYORS T: 336-886-4821 • F: 336-886-4458 • License: F-0245 6415 Old Plank Road, High Point, NC 27265 • www.dmp-inc.com �. �N CAROB Q L• 25496 = 06/18/2022 Y- FNG1NEE5'. ��**";"IMIN A� Channel Design Calculations Per NC Erosion Control Manual dimp Project: Nordfab Building Expansion Proj. No: 210238.00 Davis • Martin • Powell Client: Norfab LLC 6415 Old Plank Road Date: 18-Jun-22 High Point, NC 27265 Revised: p. 336.886.4821 DITCH #: D-1 Temporary Lining Common C Factors and Composite C Calc. - Table 8.03b S&EC Manual Land Use Range Use Area of CA Bare Earth 0.30-0.60 0.45 0.410 0.185 Impervious 0.75-0.95 0.85 1.220 1.037 0.000 Woods 0.05-0.25 0.15 0.000 Grass 1 0.10-0.30 1 0.20 1 0.000 1 0.000 Total = 1 1.630 1 1.222 Q=C*i*A Side Slope (Hor to Vert) Bottom Width in Feet MAX Slope in % Mannino n i= 6.98 (in/hr) Taken from NOAA IDF Table 25-Mar-14 A= 1.630 acre OK Q10= 8.53 cfs BARE EARTH Trapezoidal Channel 3 to 1 1 1.3 = 0.013 0.020 Bare Earth WETTED FLOW DEPTH PERIM. AREA HYD MANNING FLOW FEET FT SF RADIUS GPD CFS VEL 0.65 5.122 1.926 0.376 5,510,160 8.53 4.43 VELOCITY TOO FAST- LINER REQUIRED Try STRAW BLANKET Mannino n for Liner Chosen 0.035 WETTED FLOW DEPTH PERIM. AREA HYD MANNING FLOW FEET FT SF RADIUS GPD CFS VEL 0.85 6.353 2.995 0.471 5,691,727 8.81 2.94 TRACTIVE FORCE CALCULATION FOR TEMPORARY LINER T=YDS Y=62.4 PCF D=FLOW DEPTH S=CHANNELSLOPE STRAW BLANKET COCONUT BLANKET TURF REINF. MATTING CLASS B RIPRAP CLASS I RIPRAP CLASS II RIPRAP Mannings 'n' (Table 8.05e & 8.05f S&EC Manual) "T" max PRODUCT n value for depth (ft) 0-0.5' 0.5-2.0' 0.055 0.035 0.021 1.55 PSF NAG S150 0.022 0.018 0.014 2.25 PSF NAG C125 0.041 0.025 0.012 3.20 PSF NAG C350 0.109 0.072 1 0.036 3.50 PSF 8" D50 0.113 0.075 1 0.038 5.00 PSF 10" D50 0.118 0.081 1 0.042 1 7.50 PSF 14" D50 LINING REQUIRED: STRAW BLANKET LINING PROVIDED: COCONUT BLANKET Channel Design Calculations 1.55 PSF North American Green C125 or Eq. Per NC Erosion Control Manual Project: Nordfab Building Expansion Proj. No: 210238.00 Client: Norfab LLC Date: 18-Jun-22 Revised: [limp Davis • Martin • Powell 6415 Old Plank Road High Point, NC 27265 p. 336.886.4821 DITCH #: D-1 Permanent Lining Capacity Common C Factors and Composite C Calc. - Table 8.03b S&EC Manual Land Use Range Use Area of CA Bare Earth 0.30-0.60 0.45 0.000 0.000 Impervious 0.75-0.95 0.85 1.220 1.037 Woods 0.05-0.25 0.15 0.000 0.000 Grass 0.10-0.30 0.20 0.410 0.082 Total = 1.630 1.119 Q=C*i*A Side Slope (Hor to Vert) Bottom Width in Feet MIN Slope in % Manning n composite c;= o.b9 i= 6.98 (in/hr) Taken from NOAA IDF Table 6-May-15 A= 1.630 acre OK Q10= 7.81 cfs VEGETATED CHANNEL Trapezoidal Channel 3 to 1 1 1.3 = 0.013 0.057 Grass Class D - 2" to 6" (Extrapolated from Figure 8.05c S&EC Manual) WETTED FLOW DEPTH PERIM. AREA HYD MANNING FLOW FEET FT SF RADIUS GPD CFS VEL (FPS) 0.99 7.286 3.957 0.543 5,047,784 7.81 1.97 Max Permissible Velocity for design slope: 5.5 FPS Table 8.05a S&EC Manual OK VR n dill 1.072 0.057 0.00 CHANNEL SUMMARY TOP WIDTH AT REQUIRED DEPTH = 6.96 FT 0.99 FT DEPTH REQUIRED Side Slope (H:V) 3 :1 \ / 1.00 FT DEPTH PROVIDED GOOD Bottom Width 1 FT Longitudinal Slope 1 % TEMPORARY LINER PERMANENT LINER COCONUT BLANKET Grass Class D - 2" to 6" North American Green C125 or Eq. Channel Design Calculations Per NC Erosion Control Manual dimp Project: Nordfab Building Expansion Proj. No: 210238.00 Davis • Martin • Powell Client: Norfab LLC 6415 Old Plank Road Date: 18-Jun-22 High Point, NC 27265 Revised: p. 336.886.4821 DITCH #: D-2 Temporary Lining Common C Factors and Composite C Calc. - Table 8.03b S&EC Manual Land Use Range Use Area of CA Bare Earth 0.30-0.60 0.45 0.520 0.234 Impervious 0.75-0.95 0.85 1.620 1.377 0.000 Woods 0.05-0.25 0.15 0.000 Grass 1 0.10-0.30 1 0.20 1 0.000 1 0.000 Tota I = 1 2.140 1 1.611 Q=C*i*A Side Slope (Hor to Vert) Bottom Width in Feet MAX Slope in % Mannino n i= 6.98 (in/hr) Taken from NOAA IDF Table 25-Mar-14 A= 2.140 acre OK Q10= 11.24 cfs BARE EARTH Trapezoidal Channel 3 to 1 1 0.75 = 0.0075 0.020 Bare Earth WETTED FLOW DEPTH PERIM. AREA HYD MANNING FLOW FEET FT SF RADIUS GPD CFS VEL 0.84 6.334 2.978 0.470 7,506,649 11.62 3.90 VELOCITY TOO FAST- LINER REQUIRED Try STRAW BLANKET Mannino n for Liner Chosen 0.035 WETTED FLOW DEPTH PERIM. AREA HYD MANNING FLOW FEET FT SF RADIUS GPD CFS VEL 1.07 7.783 4.524 0.581 7,506,649 11.62 2.57 TRACTIVE FORCE CALCULATION FOR TEMPORARY LINER T=YDS Y=62.4 PCF D=FLOW DEPTH S=CHANNELSLOPE STRAW BLANKET COCONUT BLANKET TURF REINF. MATTING CLASS B RIPRAP CLASS I RIPRAP CLASS II RIPRAP T= 0.50 PSF Mannings 'n' (Table 8.05e & 8.05f S&EC Manual) "T" max PRODUCT n value for depth (ft) 0-0.5' 0.5-2.0' 0.055 0.035 0.021 1.55 PSF NAG S150 0.022 0.018 0.014 2.25 PSF NAG C125 0.041 0.025 0.012 3.20 PSF NAG C350 0.109 0.072 1 0.036 3.50 PSF 8" D50 0.113 0.075 1 0.038 5.00 PSF 10" D50 0.118 0.081 1 0.042 1 7.50 PSF 14" D50 LINING REQUIRED: STRAW BLANKET LINING PROVIDED: STRAW BLANKET Channel Design Calculations 1.55 PSF North American Green S150 or Eq. Per NC Erosion Control Manual Project: Nordfab Building Expansion Proj. No: 210238.00 Client: Norfab LLC Date: 18-Jun-22 Revised: [limp Davis • Martin • Powell 6415 Old Plank Road High Point, NC 27265 p. 336.886.4821 DITCH #: D-2 Permanent Lining Capacity Common C Factors and Composite C Calc. - Table 8.03b S&EC Manual Land Use Range Use Area of CA Bare Earth 0.30-0.60 0.45 0.000 0.000 Impervious 0.75-0.95 0.85 1.620 1.377 Woods 0.05-0.25 0.15 0.000 0.000 Grass 0.10-0.30 0.20 0.520 0.104 Total = 2.140 1.481 Q=C*i*A Side Slope (Hor to Vert) Bottom Width in Feet MIN Slope in % Manning n composite c;= o.b9 i= 6.98 (in/hr) Taken from NOAA IDF Table 6-May-15 A= 2.140 acre OK Q10= 10.34 cfs VEGETATED CHANNEL Trapezoidal Channel 3 to 1 1 0.75 = 0.0075 0.055 Grass Class D - 2" to 6" (Extrapolated from Figure 8.05c S&EC Manual) WETTED FLOW DEPTH PERIM. AREA HYD MANNING FLOW FEET FT SF RADIUS GPD CFS VEL (FPS) 1.25 8.905 5.936 0.667 6,900,899 10.68 1.80 Max Permissible Velocity for design slope: 5.5 FPS Table 8.05a S&EC Manual OK VR n dill 1.199 0.055 0.00 CHANNEL SUMMARY TOP WIDTH AT REQUIRED DEPTH = 8.50 FT 1.25 FT DEPTH REQUIRED Side Slope (H:V) 3 :1 \ / 2.00 FT DEPTH PROVIDED GOOD Bottom Width 1 FT Longitudinal Slope 1 % TEMPORARY LINER PERMANENT LINER STRAW BLANKET Grass Class D - 2" to 6" North American Green S150 or Eq. Channel Design Calculations Per NC Erosion Control Manual dimp Project: Nordfab Building Expansion Proj. No: 210238.00 Davis • Martin • Powell Client: Norfab LLC 6415 Old Plank Road Date: 18-Jun-22 High Point, NC 27265 Revised: p. 336.886.4821 DITCH #: D-3 Temporary Lining Common C Factors and Composite C Calc. - Table 8.03b S&EC Manual Land Use Range Use Area of CA Bare Earth 0.30-0.60 0.45 0.450 0.203 Impervious 0.75-0.95 0.85 0.050 0.043 0.000 Woods 0.05-0.25 0.15 0.000 Grass 1 0.10-0.30 1 0.20 1 0.000 1 0.000 Total = 1 0.500 1 0.245 Q=C*i*A Side Slope (Hor to Vert) Bottom Width in Feet MAX Slope in % Mannino n i= 6.98 (in/hr) Taken from NOAA IDF Table 25-Mar-14 A= 0.500 acre OK Q10= 1.71 cfs BARE EARTH Trapezoidal Channel 3 to 1 0 11.5 = 0.115 0.020 Bare Earth WETTED FLOW DEPTH PERIM. AREA HYD MANNING FLOW FEET FT SF RADIUS GPD CFS VEL 0.29 1.839 0.254 0.138 1,105,189 1.71 6.74 VELOCITY TOO FAST- LINER REQUIRED Try COCONUT BLANKET Mannino n for Liner Chosen 0.022 WETTED FLOW DEPTH PERIM. AREA HYD MANNING FLOW FEET FT SF RADIUS GPD CFS VEL 0.30 1.906 0.272 0.143 1,105,190 1.71 6.28 TRACTIVE FORCE CALCULATION FOR TEMPORARY LINER T=YDS Y=62.4 PCF D=FLOW DEPTH S=CHANNELSLOPE STRAW BLANKET COCONUT BLANKET TURF REINF. MATTING CLASS B RIPRAP CLASS I RIPRAP CLASS II RIPRAP T= 2.16 PSF Mannings 'n' (Table 8.05e & 8.05f S&EC Manual) "T" max PRODUCT n value for depth (ft) 0-0.5' 0.5-2.0' 0.055 0.035 0.021 1.55 PSF NAG S150 0.022 0.018 0.014 2.25 PSF NAG C125 0.041 0.025 0.012 3.20 PSF NAG C350 0.109 0.072 1 0.036 3.50 PSF 8" D50 0.113 0.075 1 0.038 5.00 PSF 10" D50 0.118 0.081 1 0.042 1 7.50 PSF 14" D50 LINING REQUIRED: COCONUT BLANKET LINING PROVIDED: COCONUT BLANKET Channel Design Calculations 2.25 PSF North American Green C125 or Eq. Per NC Erosion Control Manual Project: Nordfab Building Expansion Proj. No: 210238.00 Client: Norfab LLC Date: 18-Jun-22 Revised: [limp Davis • Martin • Powell 6415 Old Plank Road High Point, NC 27265 p. 336.886.4821 DITCH #: D-3 Permanent Lining Capacity Common C Factors and Composite C Calc. - Table 8.03b S&EC Manual Land Use Range Use Area of CA Bare Earth 0.30-0.60 0.45 0.000 0.000 Impervious 0.75-0.95 0.85 0.050 0.043 Woods 0.05-0.25 0.15 0.000 0.000 Grass 0.10-0.30 0.20 0.450 0.090 Total = 0.500 0.133 Q=C*i*A Side Slope (Hor to Vert) Bottom Width in Feet MIN Slope in % Manning n composite (:= 0.27 i= 6.98 (in/hr) Taken from NOAA IDF Table 6-May-15 A= 0.500 acre OK Q10= 0.92 cfs VEGETATED CHANNEL Trapezoidal Channel 3 to 1 0 11.5 = 0.115 0.100 Grass Class D - 2" to 6" (Extrapolated from Figure 8.05c S&EC Manual) WETTED FLOW DEPTH PERIM. AREA HYD MANNING FLOW FEET FT SF RADIUS GPD CFS VEL (FPS) 0.42 2.668 0.534 0.200 597,704 0.92 1.73 Max Permissible Velocity for design slope: 3.5 FPS Table 8.05a S&EC Manual OK VR n dill 0.347 0.100 0.00 CHANNEL SUMMARY TOP WIDTH AT REQUIRED DEPTH = 2.53 FT Side Slope (H:V) 3 :1 Bottom Width 0 FT Longitudinal Slope 12 % 0.42 FT DEPTH REQUIRED 1.00 FT DEPTH PROVIDED GOOD TEMPORARY LINER PERMANENT LINER COCONUT BLANKET Grass Class D - 2" to 6" North American Green C125 or Eq. Channel Design Calculations Per NC Erosion Control Manual dimp Project: Nordfab Building Expansion Proj. No: 210238.00 Davis • Martin • Powell Client: Norfab LLC 6415 Old Plank Road Date: 18-Jun-22 High Point, NC 27265 Revised: p. 336.886.4821 DITCH #: D-4 Temporary Lining Common C Factors and Composite C Calc. - Table 8.03b S&EC Manual Land Use Range Use Area of CA Bare Earth 0.30-0.60 0.45 0.480 0.216 Impervious 0.75-0.95 0.85 0.220 0.187 0.000 Woods 0.05-0.25 0.15 0.000 Grass 1 0.10-0.30 1 0.20 1 0.000 1 0.000 Total = 1 0.700 1 0.401 Q=C*i*A Side Slope (Hor to Vert) Bottom Width in Feet MAX Slope in % Mannino n i= 6.98 (in/hr) Taken from NOAA IDF Table 25-Mar-14 A= 0.700 acre OK Q10= 2.81 cfs BARE EARTH Trapezoidal Channel 3 to 1 0 2.5 = 0.025 0.020 Bare Earth WETTED FLOW DEPTH PERIM. AREA HYD MANNING FLOW FEET FT SF RADIUS GPD CFS VEL 0.47 2.950 0.653 0.221 1,817,925 2.81 4.31 VELOCITY TOO FAST- LINER REQUIRED Try STRAW BLANKET Mannino n for Liner Chosen 0.055 WETTED FLOW DEPTH PERIM. AREA HYD MANNING FLOW FEET FT SF RADIUS GPD CFS VEL 0.68 4.311 1.394 0.323 1,817,924 2.81 2.02 TRACTIVE FORCE CALCULATION FOR TEMPORARY LINER T=YDS Y=62.4 PCF D=FLOW DEPTH S=CHANNELSLOPE STRAW BLANKET COCONUT BLANKET TURF REINF. MATTING CLASS B RIPRAP CLASS I RIPRAP CLASS II RIPRAP T= 1.06 PSF Mannings 'n' (Table 8.05e & 8.05f S&EC Manual) "T" max PRODUCT n value for depth (ft) 0-0.5' 0.5-2.0' 0.055 0.035 0.021 1.55 PSF NAG S150 0.022 0.018 0.014 2.25 PSF NAG C125 0.041 0.025 0.012 3.20 PSF NAG C350 0.109 0.072 1 0.036 3.50 PSF 8" D50 0.113 0.075 1 0.038 5.00 PSF 10" D50 0.118 0.081 1 0.042 1 7.50 PSF 14" D50 LINING REQUIRED: STRAW BLANKET LINING PROVIDED: STRAW BLANKET Channel Design Calculations 1.55 PSF North American Green S150 or Eq. Per NC Erosion Control Manual Project: Nordfab Building Expansion Proj. No: 210238.00 Client: Norfab LLC Date: 18-Jun-22 Revised: [limp Davis • Martin • Powell 6415 Old Plank Road High Point, NC 27265 p. 336.886.4821 DITCH #: D-4 Permanent Lining Capacity Common C Factors and Composite C Calc. - Table 8.03b S&EC Manual Land Use Range Use Area of CA Bare Earth 0.30-0.60 0.45 0.000 0.000 Impervious 0.75-0.95 0.85 0.220 0.187 Woods 0.05-0.25 0.15 0.000 0.000 Grass 0.10-0.30 0.20 0.480 0.096 Total = 0.700 0.283 Q=C*i*A Side Slope (Hor to Vert) Bottom Width in Feet MIN Slope in % Manning n composite c;= UAU i= 6.98 (in/hr) Taken from NOAA IDF Table 6-May-15 A= 0.700 acre OK Q10= 1.98 cfs VEGETATED CHANNEL Trapezoidal Channel 3 to 1 0 2.5 = 0.025 0.088 Grass Class D - 2" to 6" (Extrapolated from Figure 8.05c S&EC Manual) WETTED FLOW DEPTH PERIM. AREA HYD MANNING FLOW FEET FT SF RADIUS GPD CFS VEL (FPS) 0.71 4.497 1.517 0.337 1,276,607 1.98 1.30 Max Permissible Velocity for design slope: 5.5 FPS Table 8.05a S&EC Manual OK VR n dill 0.439 0.088 0.00 CHANNEL SUMMARY TOP WIDTH AT REQUIRED DEPTH = 4.27 FT 0.71 FT DEPTH REQUIRED Side Slope (H:V) 3 :1 \ / 1.00 FT DEPTH PROVIDED GOOD Bottom Width 0 FT Longitudinal Slope 3 % TEMPORARY LINER PERMANENT LINER STRAW BLANKET Grass Class D - 2" to 6" North American Green S150 or Eq.