SW6220702_Design Calculations (Riprap)_20220810

DATE
DESIGN PHASE
5-24-2022
PRELIMECT
NAME
PLOCATION
PROJECT NO
CONSTR / Xr
Gate Estates
1279
REVISION
RECORD
BY
Cumberland County, North Carolina
BPB
OTHER
(SPECIFY)
CHECKED BY
CSB
Storm Outlet Structure
FES No.=
PIPE 1 OUT
Pipe Dia=
30
in
Q10 =
23.87
cfs
Qfull =
53.77
cfs
Vfull =
10.94
fps
From Fig.
8.06.b.1:
From Fig.
8.06.b.2:
s
Length
Storm Outlet Structure
FES No.=
PIPE 2 OUT
Pipe Dia=
30
in
Q10 =
22.63
cfs
Qfull =
30.92
cfs
Vfull =
6.29
fps
From Fig.
8.06.b.1:
From Fig.
8.06.b.2:
s
v 3
Length
Q10/QfuI1 = 0.44
V/Vfu11 = 0.96
V = 10.5 fps
Zone = 3
D50
= 10 in
DMAX
= 15 in
Riprap Class
= 1
Apron Thickness
= 22.5 in
Apron Length
= 20.0 ft
Apron Width @ Outlet
= 7.5 ft
Apron Width @ End
= 22.5 ft
Q10/Qfu11 = 0.73
V/Vfu11 = 1.09
V = 6.9 fps
Zone = 2
D50
= 8 in
DMAX
= 12 in
Riprap Class
= B
Apron Thickness
= 18 in
Apron Length
= 15.0 ft
Apron Width @ Outlet
= 7.5 ft
Apron Width @ End
= 17.5 ft
1784-Storm Drainage for Spread(REDO).xls LATEST REVISION: 8/10/2022 1:43 PM PAGE 1 OF 3

• ' ' • •
DATE
DESIGN PHASE
PRELIM
5-24-2022
PROJECT NAME
PROJECT NO
CONSTR
/ X /
Collier Gate Estates
1279
REVISION
RECORD
LOCATION
BY
Cumberland County, North Carolina
BPB
OTHER
(SPECIFY)
CHECKED BY
CSB
Storm Outlet Structure
FES No.= PIPE 3 OUT
Q10/Qfull =
1.08
Pipe Dia= 18 in
V/Vfull =
1.11
Q10 = 8.54 cfs
V =
5.0
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
Riprap Class
=
B
v s
Apron Thickness
=
18
in
v 3
Apron Length
=
9.0
ft
Apron Width @ Outlet
=
4.5
ft
Length
Apron Width @ End
=
10.5
ft
Storm Outlet Structure
FES No.= PIPE 4 OUT
Q10/Qfull =
0.51
Pipe Dia= 18 in
V/Vfull =
1.00
Q10 = 4.00 cfs
V =
4.4
fps
Qfull = 7.83 cfs
Vfull = 4.42 fps
From Fig. 8.06.b.1:
Zone
=
2
From Fig. 8.06.b.2:
D50
=
8
in
DMAX
=
12
in
Riprap Class
=
B
s
Apron Thickness
=
18
in
Apron Length
=
9.0
ft
Apron Width @ Outlet
=
4.5
ft
Length
Apron Width @ End
=
10.5
ft
1784-Storm Drainage for Spread(REDO).xls LATEST REVISION: 8/10/2022 1:43 PM PAGE 2 OF 3

PROJECT NAME
Collier Gate Estates
LOCATION
Cumberland Countv, North Carolina
Storm Outlet Structure
FES No.=
PIPE 5 OUT
Pipe Dia=
18
in
Q10 =
5.04
cfs
Qfull =
7.92
cfs
Vfull =
4.47
fps
From Fig. 8.06.b.1:
From Fig. 8.06.b.2:
s
v 3
Length
DATE
DESIGN PHASE
PRELIM
5-24-2022
PROJECT NO
CONSTR
1279
REVISION
RECORD
BY
BPB
OTHER
(SPECIFY)
CHECKED BY
CSB
Q10/QfuI1 = 0.64
V/Vfu11 = 1.06
V = 4.7 fps
Zone = 2
D50
= 8 in
DMAX
= 12 in
Riprap Class
= B
Apron Thickness
= 18 in
Apron Length
= 9.0 ft
Apron Width @ Outlet
= 4.5 ft
Apron Width @ End
= 10.5 ft
1784-Storm Drainage for Spread(REDO).xls LATEST REVISION: 8/10/2022 1:43 PM PAGE 3 OF 3