SW6220701_Design Calculations_20220810 (6)

' ' • •
DATE
DESIGN PHASE
6-1-2022
PRELIM
NAME
rROCK
PROJECT NO
CONSTR / XLL
MANOR
1809
REVISIONN
RECORD
BY
Cumberland County, North Carolina
BPB
OTHER
(SPECIFY)
CHECKED BY
CSB
Storm Outlet Structure
FES No.=
PIPE 1 OUT
Pipe Dia=
18
in
Q10 =
1.69
cfs
Qfull =
7.69
cfs
Vfull =
4.34
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 =
9.09
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
Q1 o/Qfu I = 0.22
V/Vfu11 = 0.78
V = 3.4 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
Q10/Qfu11 = 0.55
V/Vfu I = 1.02
V = 5.4 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
1809-Storm Drainage for Spread.xls LATEST REVISION: 8/10/2022 1:17 PM PAGE 1 OF 1