SW6240905_Design Calculations (Riprap)_20241016

OUTLET PROTECTION DATE DESIGN PHASE
DESIGN 7-22-24 PRELIM / /
PROJECT NAME PROJECT NO CONSTR / X /
Boone Trail Farms Subdivision 2000 REVISION / /
LOCATION BY RECORD / /
Harnett County, North Carolina CEK OTHER / /
CHECKED BY (SPECIFY)
CSB
Storm Outlet Structure
FES No.= PIPE 1 OUT Qio/Qfull = 0.26
Pipe Dia= 24 in V/Vfull = 0.83
Q10= 11.68 cfs V= 12.0 fps
Qfull = 45.24 cfs
Vfull = 14.38 fps
From Fig. 8.06.b.1: Zone = 3
From Fig. 8.06.b.2: D5o = 10 in
DMAX = 15 in
III
�•�•�•�•�•� Riprap Class = 1
i•••••i•••• L Apron Thickness = 22.5 in
••••••••••• _•�•������••�� 3 Apron Length 16.0 ft
1•�•�•�•1•1•�• Apron Width @ Outlet = 6 ft
•• •• •••
Apron Width @ End = 18.0 ft
Length
Storm Outlet Structure
FES No.= PIPE 2 OUT Q1o/Qfull = 0.91
Pipe Dia= 30 in V/Vfull = 1.13
Qio= 26.46 cfs V= 6.7 fps
Qfull = 29.00 cfs
Vfull = 5.90 fps
From Fig. 8.06.b.1: Zone = 3
From Fig. 8.06.b.2: D50 = 10 in
DMAX = 15 in
Riprap Class = 1
s Apron Thickness = 22.5 in
3 Apron Length 20.0 ft
Apron Width @ Outlet = 7.5 ft
Apron Width @ End = 22.5 ft
Length
2084-Storm drainage.xlsx LATEST REVISION:10/16/2024 8:33 AM PAGE 1 OF 4

OUTLET PROTECTION DATE DESIGN PHASE
DESIGN 7-22-24 PRELIM / /
PROJECT NAME PROJECT NO CONSTR / X /
Boone Trail Farms Subdivision 2000 REVISION / /
LOCATION BY RECORD / /
Harnett County, North Carolina CEK OTHER / /
CHECKED BY (SPECIFY)
CSB
Storm Outlet Structure
FES No.= PIPE 3 OUT Q1o/Qfull = 0.37
Pipe Dia= 24 in V/Vfull = 0.91
Q10= 12.65 cfs V= 10.0 fps
Qfull = 34.42 cfs
Vfull = 10.94 fps
From Fig. 8.06.b.1: Zone = 3
From Fig. 8.06.b.2: D50 = 10 in
DMAX = 15 in
Riprap Class = 1
s Apron Thickness = 22.5 in
3 Apron Length 16.0 ft
Apron Width @ Outlet = 6 ft
Apron Width @ End = 18.0 ft
Length 1
Storm Outlet Structure
FES No.= PIPE 4 OUT Q1o/Qfull = 0.16
Pipe Dia= 18 in V/Vfull = 0.72
Q10= 2.72 cfs V= 6.9 fps
Qfull = 16.94 cfs
Vfull = 9.57 fps
From Fig. 8.06.b.1: Zone = 2
From Fig. 8.06.b.2: D5o = 8 in
DMAX = 12 in
�••••••••••••• Riprap Class = B
•••••••••••••• s Apron Thickness = 18 in
MINIM* '8 Apron Length 9.0 ft
�������������i 3 Apron Width @ Outlet = 4.5 ft
004
Apron Width @ End = 10.5 ft
Length
2084-Storm drainage.xlsx LATEST REVISION:10/16/2024 8:33 AM PAGE 2 OF 4

OUTLET PROTECTION DATE DESIGN PHASE
DESIGN 7-22-24 PRELIM / /
PROJECT NAME PROJECT NO CONSTR / X /
Boone Trail Farms Subdivision 2000 REVISION / /
LOCATION BY RECORD / /
Harnett County, North Carolina CEK OTHER / /
CHECKED BY (SPECIFY)
CSB
Storm Outlet Structure
FES No.= PIPE 5 OUT Q1o/Qfull = 0.68
Pipe Dia= 18 in V/Vfull = 1.07
Q10= 5.40 cfs V= 4.8 fps
Qfull = 7.92 cfs
Vfull = 4.47 fps
From Fig. 8.06.b.1: Zone = 2
From Fig. 8.06.b.2: D5o = 8 in
DMAX = 12 in
Riprap Class = B
s Apron Thickness = 18 in
3 Apron Length 9.0 ft
Apron Width @ Outlet = 4.5 ft
Apron Width @ End = 10.5 ft
L Length
Storm Outlet Structure
FES No.= PIPE 6 OUT Q1o/Qfull = 0.95
Pipe Dia= 30 in V/Vfull = 1.14
Q10= 27.51 cfs V= 6.7 fps
Qfull = 29.00 cfs
Vfull = 5.90 fps
From Fig. 8.06.b.1: Zone = 2
From Fig. 8.06.b.2: D5o = 8 in
DMAX = 12 in
Riprap Class = B
s Apron Thickness = 18 in
3 Apron Length 15.0 ft
Apron Width @ Outlet = 7.5 ft
Apron Width @ End = 17.5 ft
Length
2084-Storm drainage.xlsx LATEST REVISION:10/16/2024 8:33 AM PAGE 3 OF 4

OUTLET PROTECTION DATE DESIGN PHASE
DESIGN 7-22-24 PRELIM / /
PROJECT NAME PROJECT NO CONSTR / X /
Boone Trail Farms Subdivision 2000 REVISION / X /
LOCATION BY RECORD / X /
Harnett County, North Carolina CEK OTHER / X /
CHECKED BY (SPECIFY)
CSB
Storm Outlet Structure
FES No.= PIPE 7 OUT Q1o/Qfull = 0.66
Pipe Dia= 18 in V/Vfull = 1.07
Q10= 5.19 cfs V= 4.8 fps
Qfull = 7.92 cfs
Vfull = 4.47 fps
From Fig. 8.06.b.1: Zone = 2
From Fig. 8.06.b.2: D50 = 8 in
DMAX = 12 in
gorgorgorgq Riprap Class = B
L Apron Thickness = 18 in
Apron Length = 9.0 ft
Apron Width @ Outlet = 4.5 ft
Apron Width @ End = 10.5 ft
Length
2084-Storm drainage.xlsx LATEST REVISION:10/16/2024 8:33 AM PAGE 4 OF 4