SW6210303_Pipes Phase 2_20210329

Design Pipes
OBJECTIVE: DESIGN PIPE Erosion/Sediment Control
PROJ. NAME Watson Ridge Phase 2
HUA No. DD2006
LOCATION: Lxe/flarnet County NC
Design calculations for Storm Drainage Pipes at final runoff coefficient of site
PIPE NO.
DETERMINE Q25 Q=CIA
Area (ac)
BASIN INFLOW
Q25
PREV PIPE FLOW
Q25
TOTAL Q25
MAX. PIPE FLOW
Q—CdA
(Orifice Equation)
Cd � q
Dia (ft)
h =
HW/D
Qmax
DETERMINE Q25 Q=CIA
Area (ac)
BASIN INFLOW
Q25
PREV PIPE FLOW
Q25
TOTAL Q25
MAX. PIPE FLOW
Q=CdA
(Orifice Equation
Cd=
Dia (ft) —
h =
HW/D
Qmax
c� .9 (paved), c� 30 (grass), c=,6 (gravel)
I =
8.72
0.328
(paved) 2.96 (grass)
10.3
CFS
0
CFS,
10.3
CFS
2 g h
g = 32.2 FT. / SEC
0.6
1.5
A 1.76625
1.5
0.5
10.4 cfs
I
0 (gravel)
. SQ.)
PIPE NO. 2
c= .9 (paved), c= .30 (grass), c=.6 (gravel)
I =
8.72
0.063
(paved) 0.1134 (grass)
0.8
CFS
0
CFS,
0.8
CFS
2 g h
(g = 32.2 FT. / SEC
0.6
1.5
1
A= 1.76625
0.5
8.5
cfs
0 (gravel)
I SQ.)

Design Pipes
OBJECTIVE: DESIGN PIPE Erosion/Sediment Control
PROJ. NAME Watson Ridge Phase 2
HUA No. DD2006
LOCATION: I-ce"Harnet County NC
Design calculations for Storm Drainage Pipes at final runoff coefficient of site
PIPE NO.
DETERMINE Q25 Q�CIA
Area (ac)
BASIN INFLOW
Q25
PREV PIPE FLOW
Q25
TOTAL Q25
MAX. PIPE FLOW
Q=CdA
(Orifice Equation)
Cd =
Dia (ft)
h —
HW/D
Qrnax
DETERMINE Q25 Q=CIA
Area (ac)
BASIN INFLOW
Q25
PREV PIPE FLOW
Q25
TOTALQ25
MAX. PIPE FLOW
Q—CdA
(Orifice Equation
Cd�
Dia (ft)
h=
HW/D
Qmax
c= .9 (paved), c� .30 (grass), c= .6 (gravel)
I �
8.72
0.464
(paved) 1.356 (grass)
7.2
CFS
0
CFS,
7.2
CFS
2 g h
g = 32.2 FT. / SEC
0.6
1.5
A 1 �76625
3.5
0.7
15.9 C fs
5
0 (gravel)
- SQ.)
PIPE NO. 6
c= .9 (paved), c=.30 (grass), c�.6 (gravel)
I =
8.72
0-364
(paved) 3-0734 (grass)
10.9
CFS
0
CFS,
10.9
CFS
2 g h
(g = 32.2 FT, / SEC
0.6
2
A 3.14
4
0,9
30.2
CA
0 (gravel)
. SQ.)

Design Pipes
OBJECTIVE:
DESIGN
PIPE
Eros ion/Sed iment Control
PROJ. NAME
Watson Rid-e
Phase 2
HUA No.
DD2006
LOCATION:
Lxedlamet County NC
Design calculations for Storm Drainage Pipes at final
runoff coefficient of Site
PIPE NO. 3
DETERMINE Q25
Q=CIA
c= .9 (paved), c= .30 (grass), c= .6 (gravel)
Area (ac)
I �
8.72
0.281
(paved) 2.8615 (grass) 0 (gravel)
BASIN INFLOW
Q25
9.7
CFS
PREV PIPE FLOW
Q25
0
CFS,
TOTAL Q25
9.7
CFS
MAX. PIPE FLOW
Q-CdA
-2g h
(g - 32.2 FT. / SEC. SQ.
(Orifice Equation
Cd �
0.6
Dia (ft) -
1.5
A 1.76625
h -
2
HW/D
0.5
Qmax
12.0
C fs
PIPE NO. 7
DETERMINE Q25
Q=CIA
c� .9 (paved), c- .30 (grass), c= .6 (gravel)
Area (ac)
I =
8.72
0-5066
(paved) 2.8615 (grass) 0 (gravel)
BASIN INFLOW
Q25
11.5
CFS
PREV PIPE FLOW
Q25
0
CFS,
TOTALQ25
11.5
CFS
MAX. PIPE FLOW
Q=CdA
2 g h
(g 32.2 FT. / SEC. SQ.
(Oriflee Equation
Cd-
O�6
Dia (ft)
2
A= 3.14
h�
3
HW/D
0.5
Qmax
26.2
CfS
PIPE NO. 8
DETERMINE Q25
Q=CIA
c� .9 (paved), c= .30 (grass), c- .6 (gravel)
Area (ac)
1-
8.72
0.2629
(paved) 0.2629 (grass) 0 (gravel)
BASIN INFLOW
Q25
2.8
CFS

PREV PIPE FLOW
TOTAL Q25
MAX. PIPE FLOW
(Orifice Equation)
Qmax
Q25 0 CFS,
2.8 CFS
Q=CdA
2 g h
Cd —
0.6
Dia (fl)
2 A —
h —
3
HW/D
0.7
26.2 efs
( g = 32.2 FT. / SEC. SQ. )
3.14

Design Pipes
OBJECTIVE: DESIGN PIPE Eros ion/Sediment Control
PROJ. NAME Watson Ridge Phase 2
HUA No. DD2006
LOCATION: Lee/Hamet County NC
Design calculations for Storm Drainage Pipes at final runoff coefficient of site
PIPE NO.
DETERMINE Q25 Q=CIA
Area (ac)
BASIN INFLOW
Q25
PREV PIPE FLOW
Q25
TOTAL Q25
MAX. PIPE FLOW
Q=CdA
(Orifice Equation)
Cd —
Dia (ft)
h —
HW/D
Qmax
c— .9 (paved), c�,30 (grass), c=.6 (gravel)
I =
8.72
0.2492
(paved) 1.0684 (grass)
4.8
CFS
0
CFS,
4.8
CFS
4
0 (gravel)
2 g b ( g � 32.2 FT. / SEC. SQ.)
O�6
1.5 A 1.76625
3.5
0.95
15.9 CA