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Home My WebLink AboutSW6230806_Design Calculations_20240131 Permanent Diversion Swale Design Date Dec.,2023 r Project Name Project No. By Brookwood Subdivision-Phase 4 TSB-18.01 - i Location TDB Moore County,North Carolina Checked By PAP Rainfall Intensity(in/hr) Storm Design Used 2 year 10 year 25 year 100 year Ell=ln 8.83 6.28 8.00 8.83 9.91 *based on 5 min.ToC Calculating Run-off Coefficients('C') Surface Type Percentages Swale Unimp. Asphalt Concrete Brick Roof Roof Sandy Soils Heavy Soils Wooded Areas Area Area Area inclined Flat <2% 2-7% >7% <2% 2-7% >7% Areas Values 0.35 0.95 0.95 0.85 1.00 0.90 0.10 0.15 0.20 0.15 0.20 0.30 0.15 EXAMPLE 40% 15% MT 33% M MI 12% PH4-SW-01 10% 10% 80% PH4-SW-02 10% 80% 10% PH4-SW-03 40% 27% 33% PH4-SW-04 10% 10% 80% PH4-SW-05 40% 27% 33% PH4-SW-06 40% 27% 33% PH4-SW-07 40% 27% 33% PH4-SW-08 33% 20% 47% PH4-SW-09 40% 27% 33% PH4-SW-10 40% 27% 33% Design Check Drain. Drain. Calculated Use Q n Side Depth Bottom Design/ Channel Swale Area Area Cc Cc (cfs) Slope Width Trial cfs Slope EXAMPLE 43,560 sf 1.00 ac. 0.57 0.57 5.06 0.030 3:1 0.78 ft 0.00 ft Increase 1.00% PH4-SW-01 69,022 sf 1.58 ac. 0.27 0.30 4.20 _ 0.030 3:1 0.34 ft 4.00 ft OK 1.50% PH4-SW-02 95,854 sf 2.20 ac. 0.24 0.30 5.83 _ 0.030 3:1 0.40 ft 4.00 ft OK 1.50% PH4-SW-03 10,951 sf 0.25 ac. 0.49 0.49 1.08 0.030 3:1 0.18 ft 4.00 ft OK 1.50% PH4-SW-04 29,853 sf 0.69 ac. 0.27 0.30 1.82 0.030 3:1 0.21 ft 4.00 ft OK 1.50% PH4-SW-05 18,602 sf 0.43 ac. 0.49 0.49 1.83 0.030 3:1 0.19 ft 4.00 ft OK 2.68% PH4-SW-06 33,719 sf 0.77 ac. 0.49 0.49 3.33 0.030 3:1 0.27 ft 4.00 ft OK 2.68% PH4-SW-07 7,324 sf 0.17 ac. 0.49 0.49 0.72 0.030 3:1 0.11 ft 4.00 ft OK 2.00% PH4-SW-08 5,505 sf 0.13 ac. 0.44 0.44 0.49 0.030 3:1 0.10 ft 4.00 ft OK 2.00% PH4-SW-09 22,948 sf 0.53 ac. 0.49 0.49 2.26 0.030 3:1 0.23 ft 4.00 ft _ OK 2.00% PH4-SW-10 38,829 sf 0.89 ac. 0.49 0.49 3.83 0.030 3:1 0.29 ft 4.00 ft OK 2.00% Calculating Swale Size I Lining Types X-section Wetted Hydraulic Trial Trial Top Width Shear Calculated Straw Straw w/Tack Coat Area of Perimeter Radius Discharge Velocity of Channel Stress Lining S75 Straw S75 Straw with Net Swale Flow(sf) Flow(ft) (ft) (cfs) (fps) (ft) (Ib/sf) Type P300 P300 Polypropylene EXAMPLE 1.83 sf 4.93 ft 0.37 ft 4.67 cfs 2.56 ft/sec 4.68 ft 0.49 lb/sf S75 Straw P550 P500 Polypropylene PH4-SW-01 1.71 sf 6.15 ft 0.28 ft 4.42 cfs 2.59 ft/sec 6.04 ft 0.32 lb/sf S75 Straw Riprap A Class A Riprap PH4-SW-02 2.08 sf 6.53 ft 0.32 ft 5.90 cfs 2.84 ft/sec 6.40 ft 0.37 lb/sf S75 Straw Riprap B Class B Riprap PH4-SW-03 0.82 sf 5.14 ft 0.16 ft 1.46 cfs 1.79 ft/sec 5.08 ft 0.17 lb/sf S75 Straw Riprap 1 Class 1 Riprap PH4-SW-04 0.97 sf 5.33 ft 0.18 ft 1.90 cfs 1.96 ft/sec 5.26 ft 0.20 lb/sf S75 Straw PH4-SW-05 0.87 sf 5.20 ft 0.17 ft 2.14 cfs 2.47 ft/sec 5.14 ft 0.32 lb/sf S75 Straw PH4-SW-06 1.30 sf 5.71 ft 0.23 ft 3.94 cfs 3.03 ft/sec 5.62 ft 0.45 lb/sf S75 Straw PH4-SW-07 0.48 sf 4.70 ft 0.10 ft 0.73 cfs 1.53 ft/sec 4.66 ft 0.14 lb/sf S75 Straw PH4-SW-08 0.43 sf 4.63 ft 0.09 ft 0.62 cfs 1.44 ft/sec 4.60 ft 0.12 lb/sf S75 Straw PH4-SW-09 1.08 sf 5.45 ft 0.20 ft 2.57 cfs 2.38 ft/sec 5.38 ft 0.29 lb/sf S75 Straw PH4-SW-10 1.41 sf 5.83 ft 0.24 ft 3.85 cfs 2.73 ft/sec 5.74 ft 0.36 lb/sf S75 Straw Construction Schedule Minimum Bottom Side Top Channel Channel Depth Width Slope Width Slope Lining Swale (ft) (ft) (ft) PH4-SW-01 1.50 ft 4.00 ft 3:1 13.00 ft 1.50% S75 Straw PH4-SW-02 1.50 ft 4.00 ft 3:1 13.00 ft 1.50% S75 Straw PH4-SW-03 1.50 ft 4.00 ft 3:1 13.00 ft 1.50% S75 Straw PH4-SW-04 1.50 ft 4.00 ft 3:1 13.00 ft 1.50% S75 Straw PH4-SW-05 1.50 ft 4.00 ft 3:1 13.00 ft 2.68% S75 Straw PH4-SW-06 1.50 ft 4.00 ft 3:1 13.00 ft 2.68% S75 Straw PH4-SW-07 1.50 ft 4.00 ft 3:1 13.00 ft 2.00% S75 Straw PH4-SW-08 1.50 ft 4.00 ft 3:1 13.00 ft 2.00% S75 Straw PH4-SW-09 1.50 ft 4.00 ft 3:1 13.00 ft 2.00% S75 Straw PH4-SW-10 1.50 ft 4.00 ft 3:1 13.00 ft 2.00% S75 Straw Intensity information tab should be updated per local requirements,current setting is from NOAA website for the project area. indicates example user inputted data,do not delete. indicates user provided data,all else is calculated.