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Home My WebLink AboutSW6240106_Design Calculations_20240516 Project Name Riprap Dissipator#1 Date Northgate Phase 2&3 Dec. 2023 DD Project No. Location D&L Engineering, PLLC DL2317 Moore County, North Carolina 150 S. Page Street Calculated By Southern Pines, NC 28387 J LH (910)684-8646 Checked By P-2587 J L H STORM DESIGN: 25 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= 42 in. Pipe diameter in inches D-o = 3.50 ft. Pipe diameter in feet Q-25= 66.80 cfs Pipe outlet(from drainage calculations) d-50= 0.7 ft. from Figure 8.06 a L-a = 22 ft. from Figure 8.06 a Step 3. 3*D-o= 10.50 ft. 3 times the outlet pipe diameter W= 25.50 ft. Pipe diameter+Apron length Step 4. d-max 1.05 ft. Maximum Stone Diameter(1.5*d-50) in inches d-max 13 in. Maximum Stone Diameter(1.5*d-50) in feet Step 5. Thickness= 1.58 ft. Min. Apron Thickness With Filter Fabric (1.5*d-max) in feet Thickness= 19 in. Min. Apron Thickness With Filter Fabric (1.5*d-max) in inches DESIGN DIMENSIONS: Apron Dimensions Riprap Length Width 3*D-o Thick Class 22 26 11 36in. 2 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 #2 Date Northgate Phase 2&3 Dec. 2923 DD Project No. Location D&L Engineering, PLLC DL23I7 Moore County, North Carolina 150 S. Page Street Calculated By Southern Pines, NC 28387 J I H (910)684-8646 Checked By P-2587 JLH STORM DESIGN: 25 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. Pipe diameter in inches D-o = 1.50 ft. Pipe diameter in feet Q-25= 9.20 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= 4.50 ft. 3 times the outlet pipe diameter W= 10.50 ft. Pipe diameter+Apron length Step 4_ d-max 0.45 ft. Maximum Stone Diameter(1.5"d-50) in inches d-max 5 in. Maximum Stone Diameter(1.5"d-50) in feet Step 5. Thickness = 0.68 ft. Min. Apron Thickness With Filter Fabric(1.5"d-max) in feet Thickness = 8 in. Min. Apron Thickness With Filter Fabric(1.5`d-max) in inches DESIGN DIMENSIONS: 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#3 Date Northgate Phase 2&3 Dec. 2023 DD Project No. Location D&L Engineering, PLLC DL2317 Moore County, North Carolina 150 S. Page Street Calculated By Southern Pines, NC 28387 JLH (910)684-8646 Checked By P-2587 J L H STORM DESIGN: 25 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= 24 in. Pipe diameter in inches D-o= 2.00 ft. Pipe diameter in feet Q-25= 7.70 cfs Pipe outlet(from drainage calculations) d-50 = 0.4 ft. from Figure 8.06 a L-a = 12 ft. from Figure 8.06 a Step 3. 3*D-o = 6.00 ft. 3 times the outlet pipe diameter W= 14.00 ft. Pipe diameter+Apron length Step 4. d-max 0.60 ft. Maximum Stone Diameter(1.5*d-50) in inches d-max 7 in. Maximum Stone Diameter(1.5*d-50) in feet Step 5. Thickness = 0.90 ft. Min. Apron Thickness With Filter Fabric(1.5*d-max) in feet Thickness = 11 in. Min. Apron Thickness With Filter Fabric(1.5*d-max) in inches DESIGN DIMENSIONS: Apron Dimensions Riprap Length Width 3*D-o Thick Class 12 14 6 24in. 1 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#4 Date Northgate Phase 2&3 Dec. 2023 DD Project No. Location D&L Engineering, PLLC DL2317 Moore County, North Carolina 150 S. Page Street Calculated By Southern Pines, NC 28387 .1LH (910)684-8646 Checked By P-2587 .1 L H STORM DESIGN: 25 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. Pipe diameter in inches D-o= 1.50 ft. Pipe diameter in feet Q-25= 6.00 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 = 4.50 ft. 3 times the outlet pipe diameter W= 10.50 ft. Pipe diameter+Apron length Step 4. d-max 0.45 ft. Maximum Stone Diameter (1.5*d-50) in inches d-max 5 in. Maximum Stone Diameter(1.5*d-50) in feet Step 5. Thickness= 0.68 ft. Min. Apron Thickness With Filter Fabric (1.5*d-max) in feet Thickness = 8 in. Min. Apron Thickness With Filter Fabric (1.5*d-max) in inches DESIGN DIMENSIONS: Apron Dimensions Riprap Length Width 3*D-o Thick Class 9 11 5 1 Sin. 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#5 Date Northgate Phase 2&3 Dec. 2023 DD Project No. Location D&L Engineering, PLLC DL2317 Moore County, North Carolina 150 S. Page Street Calculated By Southern Pines, NC 28387 JLH (910)684-8646 Checked By P-2587 .1 L H STORM DESIGN: 25 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= 24 in. Pipe diameter in inches D-o = 2.00 ft. Pipe diameter in feet Q-25 = 14.90 cfs Pipe outlet (from drainage calculations) d-50 = 0.4 ft. from Figure 8.06 a L-a = 12 ft. from Figure 8.06 a Step 3. 3*D-o= 6.00 ft. 3 times the outlet pipe diameter W= 14.00 ft. Pipe diameter+ Apron length Step 4. d-max 0.60 ft. Maximum Stone Diameter(1.5*d-50) in inches d-max 7 in. Maximum Stone Diameter (1.5*d-50) in feet Step 5. Thickness = 0.90 ft. Min. Apron Thickness With Filter Fabric(1.5*d-max) in feet Thickness = 11 in. Min. Apron Thickness With Filter Fabric(1.5*d-max) in inches DESIGN DIMENSIONS: Apron Dimensions Riprap Length Width 3*D-o Thick Class 12 14 6 24in. 1 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#6 Date Northgate Phase 2&3 Dec.2023 DD Project No. Location D&L Engineering, PLLC DL2317 Moore County, North Carolina 150 S. Page Street Calculated By Southern Pines, NC 28387 JLH (910)684-8646 Checked By P-2587 JLH STORM DESIGN: 25 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 = 24 in. Pipe diameter in inches D-o = 2.00 ft. Pipe diameter in feet Q-25 = 14.90 cfs Pipe outlet (from drainage calculations) d-50= 0.4 ft. from Figure 8.06 a L-a = 12 ft. from Figure 8.06 a Step 3. 3*D-o= 6.00 ft. 3 times the outlet pipe diameter W= 14.00 ft. Pipe diameter+Apron length Step 4. d-max 0.60 ft. Maximum Stone Diameter (1.5"d-50) in inches d-max 7 in. Maximum Stone Diameter(1.5*d-50) in feet Step 5. Thickness = 0.90 ft. Min.Apron Thickness With Filter Fabric (1.5*d-max) in feet Thickness= 11 in. Min. Apron Thickness With Filter Fabric (1.5*d-max) in inches DESIGN DIMENSIONS: Apron Dimensions Riprap Length Width 3*D-o Thick Class 12 14 6 24in. 1 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#7 Date Northgate Phase 2&3 Dec. 2023 DD Project No. Location D&L Engineering, PLLC DL2317 Moore County, North Carolina 150 S. Page Street Calculated By Southern Pines, NC 28387 .1LH (910)684-8646 Checked By P-2587 JLH STORM DESIGN: 25 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 = 24 in. Pipe diameter in inches D-o= 2.00 ft. Pipe diameter in feet Q-25= 16.80 cfs Pipe outlet(from drainage calculations) d-50 = 0.4 ft. from Figure 8.06 a L-a = 12 ft. from Figure 8.06 a Step 3. 3*D-o = 6.00 ft. 3 times the outlet pipe diameter W= 14.00 ft. Pipe diameter+Apron length Step 4. d-max 0.60 ft. Maximum Stone Diameter(1.5*d-50) in inches d-max 7 in. Maximum Stone Diameter(1.5*d-50) in feet Step 5. Thickness= 0.90 ft. Min. Apron Thickness With Filter Fabric(1.5*d-max) in feet Thickness= 11 in. Min. Apron Thickness With Filter Fabric(1.5*d-max) in inches DESIGN DIMENSIONS: Apron Dimensions Riprap Length Width 3*D-o Thick Class 12 14 6 24in. 1 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.)