SW6220602_Design Calculations (Riprap)_20220810

DATE
DESIGN PHASE
3-23-2022
PRELIMECT
NAME
rTARRANT
PROJECT NO
CONSTR / X
ESTATES
1827
REVISIONTION
RECORD
BY
Cumberland County, North Carolina
BPB
OTHER
(SPECIFY)
CHECKED BY
CSB
Storm Outlet Structure
FES No.=
PIPE 1 OUT
Pipe Dia=
24
in
Q10 =
10.64
cfs
Qfull =
16.33
cfs
Vfull =
5.19
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=
24
in
Q10 =
13.40
cfs
Qfull =
16.56
cfs
Vfull =
5.26
fps
From Fig.
8.06.b.1:
From Fig.
8.06.b.2:
s
v 3
Length
Q10/Qfu11 = 0.65
V/Vfu11 = 1.07
V = 5.5 fps
Zone = 2
D50
= 8 in
DMAX
= 12 in
Riprap Class
= B
Apron Thickness
= 18 in
Apron Length
= 12.0 ft
Apron Width @ Outlet
= 6 ft
Apron Width @ End
= 14.0 ft
Q1 o/Qfu I = 0.81
V/Vfu 11 = 1.11
V = 5.8 fps
Zone = 2
D5o
= 8 in
DMAX
= 12 in
Riprap Class
= B
Apron Thickness
= 18 in
Apron Length
= 12.0 ft
Apron Width @ Outlet
= 6 ft
Apron Width @ End
= 14.0 ft
1827-Storm Drainage for Spread.xls LATEST REVISION: 8/10/2022 11:06 AM PAGE 1 OF 4

'
DESIGN PHASE
PRELIM
2022
NAME
7TARRANT
PROJECT NO
CONSTR
/ X
ESTATES
1827
REVISIONN
RECORD
BY
Cumberland County, North Carolina
BPB
OTHER
(SPECIFY)
CHECKED BY
CSB
Storm Outlet Structure
FES No.= PIPE 3 OUT
Q10/Qfull =
0.70
Pipe Dia= 18 in
V/Vfull =
1.08
Q10 = 5.34 cfs
V =
4.6
fps
Qfull = 7.58 cfs
Vfull = 4.28 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 =
0.86
Pipe Dia= 24 in
V/Vfull =
1.12
Q10 = 13.94 cfs
V =
5.8
fps
Qfull = 16.16 cfs
Vfull = 5.14 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
=
12.0
ft
Apron Width @ Outlet
=
6
ft
Length
Apron Width @ End
=
14.0
ft
1827-Storm Drainage for Spread.xls LATEST REVISION: 8/10/2022 11:06 AM PAGE 2 OF 4

'
DESIGN PHASE
PRELIM
2022
NAME
7TARRANT
PROJECT NO
CONSTR
/ X
ESTATES
1827
REVISIONN
RECORD
BY
Cumberland County, North Carolina
BPB
OTHER
(SPECIFY)
CHECKED BY
CSB
Storm Outlet Structure
FES No.= PIPE 5 OUT
Q10/Qfull =
1.06
Pipe Dia= 18 in
V/Vfull =
1.13
Q10 = 8.12 cfs
V =
4.9
fps
Qfull = 7.69 cfs
Vfull = 4.34 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 6 OUT
Q10/Qfull =
0.95
Pipe Dia= 30 in
V/Vfull =
1.14
Q10 = 28.06 cfs
V =
6.9
fps
Qfull = 29.60 cfs
Vfull = 6.02 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
Apron Length
=
20.0
ft
Apron Width @ Outlet
=
7.5
ft
Length
Apron Width @ End
=
22.5
ft
1827-Storm Drainage for Spread.xls LATEST REVISION: 8/10/2022 11:06 AM PAGE 3 OF 4

PROJECT NAME
TARRANT ESTATES
LOCATION
Cumberland Countv, North Carolina
Storm Outlet Structure
FES No.=
PIPE 6 OUT
Pipe Dia=
30
in
Q10 =
28.06
cfs
Qfull =
29.60
cfs
Vfull =
6.02
fps
From Fig. 8.06.b.1:
From Fig. 8.06.b.2:
s
v 3
Length
DATE
DESIGN PHASE
PRELIM
3-23-2022
PROJECT NO
CONSTR
1827
REVISION
RECORD
BY
BPB
OTHER
(SPECIFY)
CHECKED BY
CSB
Q10/Qful1 = 0.95
V/Vfu I = 1.14
V = 6.9 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
1827-Storm Drainage for Spread.xls LATEST REVISION: 8/10/2022 11:06 AM PAGE 4 OF 4