SW6220101_Design Calculations (Riprap)_20220614

DATE
DESIGN PHASE
11-3-21
PRELIM
rPROJECT NAME
PROJECT NO
CONSTR / Xshire
Subdivision Phase 7
1070
REVISIONTION
RECORD
BY
Harnett County, North Carolina
CEK
OTHER
(SPECIFY)
CHECKED BY
CSB
Storm Outlet Structure
FES No.=
FES-43
Pipe Dia=
42
in
Q10 =
67.03
cfs
Qfull =
165.58
cfs
Vfull =
17.19
fps
From Fig.
8.06.b.1:
From Fig.
8.06.b.2:
s
Length
Storm Outlet Structure
FES No.=
FES-48
Pipe Dia=
15
in
Q10 =
3.62
cfs
Qfull =
18.43
cfs
Vfull =
14.99
fps
From Fig.
8.06.b.1:
From Fig.
8.06.b.2:
Zone
D5o
DMAX
Riprap Class
Apron Thickness
Apron Length
Apron Width @ Outlet
Apron Width @ End
Zone
D50
DMAX
Riprap Class
Apron Thickness
Apron Length
Apron Width @ Outlet
Apron Width @ End
Q10/Qful1 = 0.40
V/Vfu I = 0.94
V = 16.2 fps
= 6
= 14 in
= 21 in
= 2
= 31.5 in
= 35.0 ft
= 10.5 ft
= 38.5 ft
Q10/Qful1 = 0.20
V/Vfull = 0.78
V = 11.7 fps
= 3
= 10 in
= 15 in
= 1
= 22.5 in
= 10.0 ft
= 3.75 ft
= 11.3 ft
1070-Storm Drainage for Spread.xls LATEST REVISION: 6/14/2022 2:27 PM PAGE 1 OF 3

DATE
DESIGN PHASE
PRELIM
11-3-21
rPROJECT NAME
PROJECT NO
CONSTR / Xshire
Subdivision Phase 7
1070
REVISIONTION
RECORD
BY
Harnett County, North Carolina
CEK
OTHER
(SPECIFY)
CHECKED BY
CSB
Storm Outlet Structure
FES No.=
FES-50
Pipe Dia=
15
in
Q10 =
1.64
cfs
Qfull =
5.74
cfs
Vfull =
4.67
fps
From Fig.
8.06.b.1:
From Fig.
8.06.b.2:
Storm Outlet Structure
FES No.=
FES-55
Pipe Dia=
30
in
Q10 =
28.54
cfs
Qfull =
43.32
cfs
Vfull =
8.81
fps
From Fig.
8.06.b.1:
From Fig.
8.06.b.2:
s
Length
Zone
D5o
DMAX
Riprap Class
Apron Thickness
Apron Length
Apron Width @ Outlet
Apron Width @ End
Zone
D5o
DMAX
Riprap Class
Apron Thickness
Apron Length
Apron Width @ Outlet
Apron Width @ End
Q10/Qful1 = 0.29
V/Vfull = 0.85
V = 4.0 fps
= 2
= 8 in
= 12 in
= B
= 18 in
= 7.5 ft
= 3.75 ft
= 8.8 ft
Q10/Qful1 = 0.66
V/Vfull = 1.07
V = 9.4 fps
= 3
= 10 in
= 15 in
= 1
= 22.5 in
= 20.0 ft
= 7.5 ft
= 22.5 ft
1070-Storm Drainage for Spread.xls LATEST REVISION: 6/14/2022 2:27 PM PAGE 2 OF 3

DATE
DESIGN PHASE
PRELIM
11-3-21
rPROJECT NAME
PROJECT NO
CONSTR / Xshire
Subdivision Phase 7
1070
REVISIONTION
RECORD
BY
Harnett County, North Carolina
CEK
OTHER
(SPECIFY)
CHECKED BY
CSB
Storm Outlet Structure
FES No.=
PIPE 1
Pipe Dia=
15
in
Q10 =
4.04
cfs
Qfull =
15.60
cfs
Vfull =
12.70
fps
From Fig.
8.06.b.1:
From Fig.
8.06.b.2:
Storm Outlet Structure
FES No.=
FES-59
Pipe Dia=
36
in
Q10 =
72.48
cfs
Qfull =
91.36
cfs
Vfull =
12.91
fps
From Fig.
8.06.b.1:
From Fig.
8.06.b.2:
s
Length
Zone
D5o
DMAX
Riprap Class
Apron Thickness
Apron Length
Apron Width @ Outlet
Apron Width @ End
Zone
D5o
DMAX
Riprap Class
Apron Thickness
Apron Length
Apron Width @ Outlet
Apron Width @ End
Q10/Qful1 = 0.26
V/Vfull = 0.83
V = 10.6 fps
= 3
= 10 in
= 15 in
= 1
= 22.5 in
= 10.0 ft
= 3.75 ft
= 11.3 ft
Q10/Qful1 = 0.79
V/Vfu I = 1.10
V = 14.3 fps
= 4
= 10 in
= 15 in
= 1
= 22.5 in
= 24.0 ft
= 9 ft
= 27.0 ft
1070-Storm Drainage for Spread.xls LATEST REVISION: 6/14/2022 2:27 PM PAGE 3 OF 3