SW4211201_Design Calculations (Culvert)_20220113

Date: 10/8/2021
Project Number: 21-0577
PIPE DATA SHEET
Sheet 1 of
I.D. No.: County: Forsyth Designed By: JFO Reviewed By:
HSR
GP Elev.:
865.10 ft
Plan Summary Data
Shoulder
Drainage Area:
3.6
Alignment:
Grove
Elev.: 866.00
ft
Design Freq.:
25
Station:
0+34
Design Disch.:
11.29
Skew:
0
Outlet Ground
Elev.
Design H.W. Elev.:
864.80
Size/Type Pipe:
Type Entrance:
Groove -End
Inlet Ground
Elev.
ft H.W.
H
ft
Q100 Disch.:
Q100 Elev.:
12.47
865.10
Direction of Flow:
RT to LT
LSo
T.W.
Overtopping Freq.:
>100 YR
Hydrologic Method:
Rational
Inlet
So= 3.3%
Overtopping Disch.:
9.90
H.W. Control Elevation:
866
Invert Elev.:
862.5 ft
L= 46.0 ft Outlet Inv. Elev.
861.0
ft
Overtopping Elev.:
865.4
H.W. Control Feature:
SR Shldr.
TW Channel Specs.:
Slope:
0.033 Lt. Side Slope=
3
RCP=.012, CMP=.024
n= 0.012
Base Width= 1.5
n=
0.035
Rt. Side Slope=
3
BARRELS
FREQ
TW
Q
Nat.
H.W.
Allow.
H.W.
Inlet Control
Outlet Control
HW
ELEV.
Vo*
Remarks
SIZE
No. Of
HW/D
HW (ft)
Ke
d,
(d,+D)/2
ho
H
LSO
HW
in
Pipes
YR
ft
ft^3/s
ft
ft
ft/ft
ft
ft
ft
ft
ft
ft
ft
ft/s
18
1
10
1.5
10.29
1.33
2.00
1.30
1.40
1.50
0.899
1.50
0.90
864.50
INLET CONTROL
18
1
25
1.6
11.29
1.53
2.30
1.37
1.44
1.60
1.082
1.50
1.18
864.80
INLET CONTROL
18
1
50
1.6
11.93
1.60
2.40
1.42
1.46
1.60
1.208
1.50
1.31
864.90
INLET CONTROL
18
1
100
1.7
12.47
1.73
1 2.60
1.46
1 1.48
1 1.70
1.321
1.50
1.52
865.10
INLET CONTROL
Notes & Calculations
Tc = 10 min
Overtopping Elevation
is lowest point on new road where water will overtop before reaching SR shoulder
SR: "State Road"
*Vo is partial flow velocity.
SUMMARY AND RECOMMENDATIONS: Install 1 @ 18" R.C. Pipe Class III or 18" HDPE Pipe (Double -walled, smooth bore)
print date: 10/8/2021

Date: 10/8/2021
Project Number: 21-0577
PIPE DATA SHEET
Sheet 2 of
I.D. No.: County: Forsyth Designed By: JFO Reviewed By:
HSR
GP Elev.:
869.50 ft
Plan Summary Data
Shoulder
Drainage Area:
1.21
Alignment:
Grove
Elev.: 869.00
ft
Design Freq.:
25
Station:
6+93
Design Disch.:
4.16
Skew:
0
Outlet Ground
Elev.
Design H.W. Elev.:
865.68
Size/Type Pipe:
Type Entrance:
Groove -End
Inlet Ground
Elev.
ft H.W.
H
864.6 ft
Q100 Disch.:
Q100 Elev.:
4.60
865.76
Direction of Flow:
LT to RT
LSo
T.W.
Overtopping Freq.:
>100 YR
Hydrologic Method:
Rational
Inlet
So=
1.0%
Overtopping Disch.:
9.90
H.W. Control Elevation:
869
Invert Elev.:
864.5 ft
L=
50.0 ft
Outlet Inv. Elev.
864.0 ft
Overtopping Elev.:
865.4
H.W. Control Feature:
Shldr. at LP
TW Channel Specs.:
Slope:
0.033 Lt. Side Slope=
3
RCP=.012, CMP=.024
n= 0.012
Base Width=
1.5
n=
0.035
Rt. Side Slope=
3
BARRELS
FREQ
TW
Q
Nat.
H.W.
Allow.
H.W.
Inlet Control
Outlet
Control
HW
ELEV.
Vo*
Remarks
SIZE
No. Of
HW/D
HW (ft)
Ke
d,
(d,+D)/2
ho
H
LSO
HW
in
Pipes
YR
ft
ft^3/s
ft
ft
ft/ft
ft
ft
ft
ft
ft
ft
ft
ft/s
15
1
10
0.8
3.79
0.88
1.10
0.79
1.02
1.02
0.294
0.50
0.81
865.60
INLET CONTROL
15
1
25
0.8
4.16
0.94
1.18
0.83
1.04
1.04
0.354
0.50
0.89
865.68
INLET CONTROL
15
1
50
0.8
4.40
0.98
1.23
0.86
1.05
1.05
0.395
0.50
0.95
865.73
INLET CONTROL
15
1
100
0.9
4.60
1.01
1 1.26
0.88
1 1.06
1 1.06
0.432
0.50
1.00
865.76
INLET CONTROL
Notes & Calculations
Tc = 10 min
Overtopping Elevation
is low point at sag
vertical curve; elevation = 869.47
LP: "Low Point"
*Vo is partial flow velocity.
SUMMARY AND RECOMMENDATIONS: Install 1 @ 15" R.C. Pipe Class III or 15" HDPE Pipe (Double -walled, smooth bore)
print date: 11/22/2021