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Home My WebLink AboutSW6210907_Design Calculations (Riprap)_20211105(Project Name Timberland Gas Station Hoke County, NC Riprap Dissipator #1 Date Sept. 2021 DO Project No. DD2114 Double D Engineering, PLLC 150 S. Page Street Southern Pines, NC 28387 (910) 684-8646 Calculated By JLH Checked By JLH STORM DESIGN: 10 Year BACKGROUND: Use the E&S Control Planning & Design Manual, Section 8.06. REFERENCE: (NCDEHNR, 1993) Step 1. Minimum Tailwater Condition Step 2. D-o = 18 in. D-o = 1.50 ft. Q-10 = 5.40 cfs d-50 = 0.3 ft. L-a = 9 ft. Step 3. 3*D-o = 4.50 ft. W = 10.50 ft. Step 4. d-max 0.45 ft. d-max 5 in. Step 5. Thickness = 0.68 ft. Thickness = 8 in. DESIGN DIMENSIONS: Pipe diameter in inches Pipe diameter in feet Pipe outlet (from drainage calculations) from Figure 8.06 a from Figure 8.06 a 3 times the outlet pipe diameter Pipe diameter + Apron length Maximum Stone Diameter (1.5*d-50) in inches Maximum Stone Diameter (1.5*d-50) in feet Min. Apron Thickness With Filter Fabric (1.5*d-max) in feet Min. Apron Thickness With Filter Fabric (1.5*d-max) in inches Apron Dimensions Riprap Length Width 3-D-o Thick Class 9 11 5 181n. B NOLOGY: Q10 = 10-Year Design Storm, Peak Discharge, (cfs) D-o = Pipe Diameter, (in. & ft.) d-50 = Mean Stone Diameter of Rip -Rap, (ft.) L-a = Length of Rip -Rap Apron, (ft.) 3*D-o = Width of Rip -Rap Apron @ Pipe Outlet, (ft.) W = Width of Rip -Rap Apron @ End of Apron, (ft.) d-max = Maximum Stone Diameter of Rip -Rap, (ft. & in.) Thickness = Thickness of Rip -Rap Apron With Filter Fabric, (ft. &in.) Project Name Timberland Gas Station Location Hoke County, NC STORM DESIGN: 10 Year Riprap Dissipator #2 Date Aug. 2021 DD Project No. DD2012 Double D Engineering, PLLC 150 S. Page Street Southern Pines, NC 28387 (910) 684-8646 Calculated By JLH Checked By JILH BACKGROUND: Use the E&S Control Planning & Design Manual, Section 8.06. ENCE: (NCDEHNR, 1993) Step 1. Minimum Tailwater Condition Step 2, Step 3. Step 4. Step 5 D-o = 18 in. Pipe diameter in inches D-o = 1.50 ft. Pipe diameter in feet Q-10 = 3.01 cfs Pipe outlet (from drainage calculations) d-50 = 0.3 ft, from Figure 8.06 a L-a = 9 ft. from Figure 8.06 a 3*0-o = 4.50 ft. W = 10.50 ft. d-max 0.45 ft d-max 5 in. Thickness = 0.68 ft. Thickness = 8 in. DESIGN DIMENSIONS: 3 times the outlet pipe diameter Pipe diameter + Apron length Maximum Stone Diameter (1.5*d-50) in inches Maximum Stone Diameter (1.5*d-50) in feet Min. Apron Thickness With Filter Fabric (1.5*d-max) in feet Min. Apron Thickness With Filter Fabric (1.5*d-max) in inches Apron Dimensions Riprap Length WWdth 3-D-o Thick Class 9 11 5 181n. a RMINOLOGY: Q10 = 10-Year Design Storm, Peak Discharge, (cfs) D-0 = Pipe Diameter, (in. & ft.) d-50 = Mean Stone Diameter of Rip -Rap, (ft.) L-a = Length of Rip -Rap Apron, (ft.) 3*D-o = Width of Rip -Rap Apron @ Pipe Outlet, (ft.) W = Width of Rip -Rap Apron @ End of Apron, (ft.) d-max = Maximum Stone Diameter of Rip -Rap, (ft. & in.) Thickness = Thickness of Rip -Rap Apron With Filter Fabric, (ft. &in.) Project Name Riprap Dissipator #3 Date Timberland Gas Station Aug, 2021 DD Project No, Location Double D Engineering, PLLC DD2012 Hoke County, NC 150 S. Page Street Calculated By Southern Pines, NC 28387 JLH (910) 684-8646 Checked By JLH STORM DESIGN: 10 Year BACKGROUND: Use the E&S Control Planning & Design Manual, Section 8.06. (REFERENCE: (NCDEHNR, 1993) Step 1. Minimum Tailwater Condition Step 2. D-o = 18 in. D-o = 1.50 ft. Q-10 = 4.89 cfs d-50 = 0.3 ft. L-a = 9 ft, Step 3. 3*D-o = 4.50 ft. W = 10.50 ft. Step 4. d-max 0.45 ft. d-max 5 in. Step 5. Thickness = 0.68 ft. Thickness = 8 in. DESIGN DIMENSIONS: Pipe diameter in inches Pipe diameter in feet Pipe outlet (from drainage calculations) from Figure 8.06 a from Figure 8.06 a 3 times the outlet pipe diameter Pipe diameter + Apron length Maximum Stone Diameter (1.5'd-50) in inches Maximum Stone Diameter (1.5*d-50) in feet Min. Apron Thickness With Filter Fabric (1.5*d-max) in feet Min. Apron Thickness With Filter Fabric (1.5*d-max) in inches Apron Dimensions Riprap Length Width 3*D-o Thick Class 9 11 5 18in. B TERMINOLOGY: Q10 = 10-Year Design Storm, Peak Discharge, (cfs) D-o = Pipe Diameter, (in. & ft.) d-50 = Mean Stone Diameter of Rip -Rap, (ft.) L-a = Length of Rip -Rap Apron, (ft.) 3*D-o = Width of Rip -Rap Apron @ Pipe Outlet, (ft.) W = Width of Rip -Rap Apron @ End of Apron, (ft.) d-max = Maximum Stone Diameter of Rip -Rap, (ft. & in.) Thickness = Thickness of Rip -Rap Apron With Filter Fabric, (ft. &in.) Project Name Riprap Dissipator 04 Date Timberland Gas Station Aug. 2021 DD Project No. Location Double D Engineering, PLLC DD2012 Hoke County, NC 150 S. Page Street Calculated By Southern Pines, NC 28387 JLH (910)684-8646 Checked By JLH STORM DESIGN: 10 Year BACKGROUND: Use the E&S Control Planning & Design Manual, Section 8.06. REFERENCE: (NCDEHNR, 1993) Step 1. Minimum Taiiwater Condition Step 2. Q-10 = 7.99 x 0.90 x 0.510 AC = 3,66 cfs Q-10 = 3.66 cfs Pipe outlet (from drainage calculations) d-50 = 0.3 ft. from Figure 8.06 a L-a = 9 ft. from Figure 8.06 a Step 3. 3*D-o = 0.00 ft. 3 times the outlet pipe diameter W = 9.00 ft. Pipe diameter + Apron length Step 4. d-max 0.45 ft. d-max 5 in. Step 5. Thickness = 0.68 ft. Thickness = 8 in. DESIGN DIMENSIONS: Maximum Stone Diameter (1.5*d-50) in inches Maximum Stone Diameter (1.5*d-50) in feet Min. Apron Thickness With Filter Fabric (1.5*d-max) in feet Min. Apron Thickness With Filter Fabric (1.5*d-max) in inches Apron Dimensions Riprap Length Width 3*D-o Thick Class 9 9 0 18in. B TERMINOLOGY: Q10 = 10-Year Design Storm, Peak Discharge, (cfs) D-o = Pipe Diameter, (in. & ft.) d-50 = Mean Stone Diameter of Rip -Rap, (ft.) L-a = Length of Rip -Rap Apron, (ft.) 3*D-o = Width of Rip -Rap Apron @ Pipe Outlet, (ft.) W = Width of Rip -Rap Apron @ End of Apron, (ft.) d-max = Maximum Stone Diameter of Rip -Rap, (ft. & in.) Thickness = Thickness of Rip -Rap Apron With Filter Fabric, (ft. &in.) Project Name Riprap Dissipator 45 Date Timberland Gas Station Aug, 2021 DD Project No. Location Double D Engineering, PLLC DD2012 Hoke County, NC 150 S. Page Street Calculated By Southern Pines, NC 28387 JLH (910) 684-8646 Checked By JLH STORM DESIGN: 10 Year BACKGROUND: Use the E&S Control Planning & Design Manual, Section 8.06. REFERENCE: (NCOE-iNR, 1993) Step 1. Minimum Tailwater Condition Steep 2. Q-10 = 7.99 x 0.90 x 0.337 AC = 2.42 cfs 0-10 = 2.42 cfs Pipe outlet (from drainage calculations) d-50 = 0.3 ft. from Figure 8.06 a L-a = 9 ft. from Figure 8.06 a Step 3. 3*D-o = 0.00 ft. 3 times the outlet pipe diameter W = 9.00 ft. Pipe diameter + Apron length Step 4. d-max 0.45 ft. d-max 5 in. Step 5_ Thickness = 0.68 ft. Thickness = 8 in. IDESIGN DIMENSIONS: Maximum Stone Diameter (1.5*d-50) in inches Maximum Stone Diameter (1.5*d-50) in feet Min. Apron Thickness With Filter Fabric (1.5*d-max) in feet Min. Apron Thickness With Filter Fabric (1.5*d-max) in inches Apron Dimensions Riprap Length Width 3-D-o Thick Class 9 9 0 18in. B TERMINOLOGY: Q10 = 10-Year Design Storm, Peak Discharge, (cfs) D-o = Pipe Diameter, (in. & ft.) d-50 = Mean Stone Diameter of Rip -Rap, (ft.) L-a = Length of Rip -Rap Apron, (ft.) 3*D-o = Width of Rip -Rap Apron @ Pipe Outlet, (ft.) W = Width of Rip -Rap Apron @ End of Apron, (ft.) d-max = Maximum Stone Diameter of Rip -Rap, (ft. & in.) Thickness = Thickness of Rip -Rap Apron With Filter Fabric, (ft. &in.)