SW5220201_Design Calculations (Swales)_20220826

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Swale Calculation Summary Rational Method
Q=CIA
5 min
Geometry
Swale #
Depth (ft)
Sideslopes (1-1:1)
Slope
Drainage Area (Acres)
BUA (ac)
Pervious
C
Q
Vallow
Vactual
Flow depth
S-1
0.6
10
1.5%
0.19
0.05
0.14
0.53
0.67
4.50
1.16
0.24
S-2
1
3
5.0%
0.36
0.06
0.30
0.49
1.16
4.50
2.82
0.37
S-3
1
4
2.0%
0.23
0.08
0.15
0.59
0.90
4.50
1.84
0.35
S-4
1
20
1.5%
0.13
0.05
0.08
0.60
0.50
4.50
0.87
0.17
S-5
1
15
2.5%
0.11
0.06
0.06
0.68
0.51
4.50
1.18
0.17
S-6
1
15
1.6%
0.10
0.07
0.03
0.77
0.53
4.50
0.98
0.19
S-7
1
15
2.2%
0.13
0.08
0.05
0.74
0.64
4.50
1.18
0.19
S-8
1
6
16.0%
0.17
0.07
0.10
0.62
0.71
4.50
3.28
0.19
S-9
0.5
15
3.3%
0.17
0.07
0.10
0.62
0.71
4.50
1.46
0.18
S-10
0.5
20
2.2%
0.16
0.05
0.11
0.56
0.59
4.50
1.15
0.16
S-11
1
4
1.5%
0.11
0.06
0.05
0.69
0.50
4.50
1.39
0.30
S-12
1
25
1.7%
0.16
0.07
0.09
0.64
0.68
4.50
0.94
0.17
5-13
1
6
3.3%
0.16
0.01
0.15
0.44
0.47
4.50
1.62
0.22
S-14
1
10
2.9%
0.10
0.06
0.04
0.72
0.47
4.50
1.30
0.19
S-15
1
5
2.5%
0.07
0.04
0.03
0.73
0.33
4.50
1.36
0.22
S-16
1
10
2.5%
0.09
0.06
0.03
0.74
0.45
4.50
1.25
0.19
S-17
1
4
3.3%
0.09
0.03
0.06
0.61
0.37
4.50
1.75
0.23
S-18
1
16
5.0%
0.09
0.00
0.09
0.43
0.26
4.50
1.34
0.11

Channel Report
Hydraflow Express Extension for Autodesk® AutoCAD® Civil 3D® by Autodesk, Inc.
S-1
Triangular
Side Slopes (z:1)
= 10.00, 10.00
Total Depth (ft)
= 0.60
Invert Elev (ft)
= 100.00
Slope (%)
= 1.50
N-Value
= 0.035
Calculations
Compute by:
Known Q
Known Q (cfs)
= 0.67
Elev (ft)
101.00 -
100.75
100.50
100.25
100.00
99.75
0 2 4 6
Section
8
Reach (ft)
Friday, Aug 26 2022
Highlighted
Depth (ft)
= 0.24
Q (cfs)
= 0.670
Area (sqft)
= 0.58
Velocity (ft/s)
= 1.16
Wetted Perim (ft)
= 4.82
Crit Depth, Yc (ft)
= 0.20
Top Width (ft)
= 4.80
EGL (ft)
= 0.26
10 12 14
Depth (ft)
1.00
0.75
0.50
0.25
L -0.25
16

Channel Report
Hydraflow Express Extension for Autodesk® AutoCAD® Civil 3D® by Autodesk, Inc.
S-2
Triangular
Side Slopes (z:1)
= 3.00, 3.00
Total Depth (ft)
= 1.00
Invert Elev (ft)
= 100.00
Slope (%)
= 5.00
N-Value
= 0.035
Calculations
Compute by:
Known Q
Known Q (cfs)
= 1.16
Elev (ft)
102.00
101.50
101.00
100.50
100.00
99.50
Section
Friday, Aug 26 2022
Highlighted
Depth (ft)
= 0.37
Q (cfs)
= 1.160
Area (sqft)
= 0.41
Velocity (ft/s)
= 2.82
Wetted Perim (ft)
= 2.34
Crit Depth, Yc (ft)
= 0.40
Top Width (ft)
= 2.22
EGL (ft)
= 0.49
Depth (ft)
2.00
1.50
1.00
0.50
_n Fn
0 1 2 3 4 5 6 7 8 vvv
Reach (ft)

Channel Report
Hydraflow Express Extension for Autodesk® AutoCAD® Civil 3D® by Autodesk, Inc.
S-3
Triangular
Side Slopes (z:1)
= 4.00, 4.00
Total Depth (ft)
= 1.00
Invert Elev (ft)
= 100.00
Slope (%)
= 2.00
N-Value
= 0.035
Calculations
Compute by:
Known Q
Known Q (cfs)
= 0.90
Elev (ft) Section
102.00
101.50
101.00
100.50
100.00
99.50
Highlighted
Depth (ft)
Q (cfs)
Area (sqft)
Velocity (ft/s)
Wetted Perim (ft)
Crit Depth, Yc (ft)
Top Width (ft)
EGL (ft)
1 2 3 4 5 6
Reach (ft)
Friday, Aug 26 2022
= 0.35
= 0.900
= 0.49
= 1.84
= 2.89
= 0.32
= 2.80
= 0.40
Depth (ft)
2.00
1.50
1.00
0.50
_n Fn
7 8 9 10 vvV

Channel Report
Hydraflow Express Extension for Autodesk® AutoCAD® Civil 3D® by Autodesk, Inc.
S-4
Triangular
Side Slopes (z:1)
= 20.00, 20.00
Total Depth (ft)
= 1.00
Invert Elev (ft)
= 100.00
Slope (%)
= 1.50
N-Value
= 0.035
Calculations
Compute by:
Known Q
Known Q (cfs)
= 0.50
Elev (ft) Section
102.00
101.50
101.00
100.50
100.00
99.50
Highlighted
Depth (ft)
Q (cfs)
Area (sqft)
Velocity (ft/s)
Wetted Perim (ft)
Crit Depth, Yc (ft)
Top Width (ft)
EGL (ft)
Friday, Aug 26 2022
= 0.17
= 0.500
= 0.58
= 0.87
= 6.81
= 0.14
= 6.80
= 0.18
Depth (ft)
2.00
1.50
1.00
0.50
_n Fn
5 10 15 20 25 30 35 40 45 50 v vV
Reach (ft)

Channel Report
Hydraflow Express Extension for Autodesk® AutoCAD® Civil 3D® by Autodesk, Inc.
S-5
Triangular
Side Slopes (z:1)
= 15.00, 15.00
Total Depth (ft)
= 1.00
Invert Elev (ft)
= 100.00
Slope (%)
= 2.50
N-Value
= 0.035
Calculations
Compute by:
Known Q
Known Q (cfs)
= 0.51
Elev (ft)
102.00
101.50
101.00
100.50
100.00
99.50
5 10 15
Section
20
Reach (ft)
Friday, Aug 26 2022
Highlighted
Depth (ft)
= 0.17
Q (cfs)
= 0.510
Area (sqft)
= 0.43
Velocity (ft/s)
= 1.18
Wetted Perim (ft)
= 5.11
Crit Depth, Yc (ft)
= 0.15
Top Width (ft)
= 5.10
EGL (ft)
= 0.19
Depth (ft)
2.00
1.50
1.00
0.50
_n Fn
25 30 35 40 v vV

Channel Report
Hydraflow Express Extension for Autodesk® AutoCAD® Civil 3D® by Autodesk, Inc.
S-6
Triangular
Side Slopes (z:1)
= 15.00, 15.00
Total Depth (ft)
= 1.00
Invert Elev (ft)
= 100.00
Slope (%)
= 1.60
N-Value
= 0.035
Calculations
Compute by:
Known Q
Known Q (cfs)
= 0.53
Elev (ft)
102.00
101.50
101.00
100.50
100.00
99.50
5 10 15
Section
20
Reach (ft)
Friday, Aug 26 2022
Highlighted
Depth (ft)
= 0.19
Q (cfs)
= 0.530
Area (sqft)
= 0.54
Velocity (ft/s)
= 0.98
Wetted Perim (ft)
= 5.71
Crit Depth, Yc (ft)
= 0.16
Top Width (ft)
= 5.70
EGL (ft)
= 0.20
Depth (ft)
2.00
1.50
1.00
0.50
_n Fn
25 30 35 40 v vV

Channel Report
Hydraflow Express Extension for Autodesk® AutoCAD® Civil 3D® by Autodesk, Inc.
S-7
Triangular
Side Slopes (z:1)
= 15.00, 15.00
Total Depth (ft)
= 1.00
Invert Elev (ft)
= 100.00
Slope (%)
= 2.20
N-Value
= 0.035
Calculations
Compute by:
Known Q
Known Q (cfs)
= 0.64
Elev (ft)
102.00
101.50
101.00
100.50
100.00
99.50
5 10 15
Section
20
Reach (ft)
Friday, Aug 26 2022
Highlighted
Depth (ft)
= 0.19
Q (cfs)
= 0.640
Area (sqft)
= 0.54
Velocity (ft/s)
= 1.18
Wetted Perim (ft)
= 5.71
Crit Depth, Yc (ft)
= 0.17
Top Width (ft)
= 5.70
EGL (ft)
= 0.21
Depth (ft)
2.00
1.50
1.00
0.50
_n Fn
25 30 35 40 v vV

Channel Report
Hydraflow Express Extension for Autodesk® AutoCAD® Civil 3D® by Autodesk, Inc.
S-8
Triangular
Side Slopes (z:1)
= 6.00, 6.00
Total Depth (ft)
= 1.00
Invert Elev (ft)
= 100.00
Slope (%)
= 16.00
N-Value
= 0.035
Calculations
Compute by:
Known Q
Known Q (cfs)
= 0.71
Elev (ft)
102.00 -
101.50
101.00
100.50
100.00
99.50
0 2 4 6
Section
8
Reach (ft)
Friday, Aug 26 2022
Highlighted
Depth (ft)
= 0.19
Q (cfs)
= 0.710
Area (sqft)
= 0.22
Velocity (ft/s)
= 3.28
Wetted Perim (ft)
= 2.31
Crit Depth, Yc (ft)
= 0.25
Top Width (ft)
= 2.28
EGL (ft)
= 0.36
10 12 14
Depth (ft)
2.00
1.50
1.00
0.50
L -0.50
16

Channel Report
Hydraflow Express Extension for Autodesk® AutoCAD® Civil 3D® by Autodesk, Inc.
S-9
Triangular
Side Slopes (z:1)
= 15.00, 15.00
Total Depth (ft)
= 0.50
Invert Elev (ft)
= 100.00
Slope (%)
= 3.30
N-Value
= 0.035
Calculations
Compute by:
Known Q
Known Q (cfs)
= 0.71
Elev (ft) Section
101.00
100.75
100.50
100.25
100.00
99.75
2 4 6 8
Highlighted
Depth (ft)
Q (cfs)
Area (sqft)
Velocity (ft/s)
Wetted Perim (ft)
Crit Depth, Yc (ft)
Top Width (ft)
EGL (ft)
10 12 14
Reach (ft)
Friday, Aug 26 2022
= 0.18
= 0.710
= 0.49
= 1.46
= 5.41
= 0.17
= 5.40
= 0.21
Depth (ft)
1.00
0.75
0.50
0.25
_n 7F
16 18 20 v v

Channel Report
Hydraflow Express Extension for Autodesk® AutoCAD® Civil 3D® by Autodesk, Inc.
S-10
Triangular
Side Slopes (z:1)
= 20.00, 20.00
Total Depth (ft)
= 0.50
Invert Elev (ft)
= 100.00
Slope (%)
= 2.20
N-Value
= 0.035
Calculations
Compute by:
Known Q
Known Q (cfs)
= 0.59
Elev (ft) Section
101.00
100.75
100.50
100.25
100.00
99.75
Highlighted
Depth (ft)
Q (cfs)
Area (sqft)
Velocity (ft/s)
Wetted Perim (ft)
Crit Depth, Yc (ft)
Top Width (ft)
EGL (ft)
Friday, Aug 26 2022
= 0.16
= 0.590
= 0.51
= 1.15
= 6.41
= 0.15
= 6.40
= 0.18
Depth (ft)
1.00
0.75
0.50
0.25
_n 7F
2 4 6 8 10 12 14 16 18 20 22 24 v v
Reach (ft)

Channel Report
Hydraflow Express Extension for Autodesk® AutoCAD® Civil 3D® by Autodesk, Inc.
S-11
Triangular
Side Slopes (z:1)
= 4.00, 4.00
Total Depth (ft)
= 1.00
Invert Elev (ft)
= 100.00
Slope (%)
= 1.50
N-Value
= 0.035
Calculations
Compute by:
Known Q
Known Q (cfs)
= 0.50
Elev (ft) Section
102.00
101.50
101.00
100.50
100.00
99.50
Highlighted
Depth (ft)
Q (cfs)
Area (sqft)
Velocity (ft/s)
Wetted Perim (ft)
Crit Depth, Yc (ft)
Top Width (ft)
EGL (ft)
1 2 3 4 5 6
Reach (ft)
Friday, Aug 26 2022
= 0.30
= 0.500
= 0.36
= 1.39
= 2.47
= 0.25
= 2.40
= 0.33
Depth (ft)
2.00
1.50
1.00
0.50
_n Fn
7 8 9 10 vvV

Channel Report
Hydraflow Express Extension for Autodesk® AutoCAD® Civil 3D® by Autodesk, Inc.
S-12
Triangular
Side Slopes (z:1)
= 25.00, 25.00
Total Depth (ft)
= 1.00
Invert Elev (ft)
= 100.00
Slope (%)
= 1.70
N-Value
= 0.035
Calculations
Compute by:
Known Q
Known Q (cfs)
= 0.68
Elev (ft) Section
102.00
101.50
101.00
100.50
100.00
99.50
Highlighted
Depth (ft)
Q (cfs)
Area (sqft)
Velocity (ft/s)
Wetted Perim (ft)
Crit Depth, Yc (ft)
Top Width (ft)
EGL (ft)
Friday, Aug 26 2022
= 0.17
= 0.680
= 0.72
= 0.94
= 8.51
= 0.14
= 8.50
= 0.18
Depth (ft)
2.00
1.50
1.00
0.50
_n Fn
5 10 15 20 25 30 35 40 45 50 55 60 v vV
Reach (ft)

Channel Report
Hydraflow Express Extension for Autodesk® AutoCAD® Civil 3D® by Autodesk, Inc.
S-13
Triangular
Side Slopes (z:1)
= 6.00, 6.00
Total Depth (ft)
= 1.00
Invert Elev (ft)
= 100.00
Slope (%)
= 3.30
N-Value
= 0.035
Calculations
Compute by:
Known Q
Known Q (cfs)
= 0.47
Elev (ft)
102.00 -
101.50
101.00
100.50
100.00
99.50
0 2 4 6
Section
8
Reach (ft)
Friday, Aug 26 2022
Highlighted
Depth (ft)
= 0.22
Q (cfs)
= 0.470
Area (sqft)
= 0.29
Velocity (ft/s)
= 1.62
Wetted Perim (ft)
= 2.68
Crit Depth, Yc (ft)
= 0.21
Top Width (ft)
= 2.64
EGL (ft)
= 0.26
10 12 14
Depth (ft)
2.00
1.50
1.00
0.50
L -0.50
16

Channel Report
Hydraflow Express Extension for Autodesk® AutoCAD® Civil 3D® by Autodesk, Inc.
S-14
Triangular
Side Slopes (z:1)
= 10.00, 10.00
Total Depth (ft)
= 1.00
Invert Elev (ft)
= 100.00
Slope (%)
= 2.90
N-Value
= 0.035
Calculations
Compute by:
Known Q
Known Q (cfs)
= 0.47
Elev (ft) Section
102.00
101.50
101.00
100.50
100.00
99.50
Highlighted
Depth (ft)
Q (cfs)
Area (sqft)
Velocity (ft/s)
Wetted Perim (ft)
Crit Depth, Yc (ft)
Top Width (ft)
EGL (ft)
Friday, Aug 26 2022
= 0.19
= 0.470
= 0.36
= 1.30
= 3.82
= 0.17
= 3.80
= 0.22
Depth (ft)
2.00
1.50
1.00
0.50
_n Fn
2 4 6 8 10 12 14 16 18 20 22 24 vvV
Reach (ft)

Channel Report
Hydraflow Express Extension for Autodesk® AutoCAD® Civil 3D® by Autodesk, Inc.
S-15
Triangular
Side Slopes (z:1)
= 5.00, 5.00
Total Depth (ft)
= 1.00
Invert Elev (ft)
= 100.00
Slope (%)
= 2.50
N-Value
= 0.035
Calculations
Compute by:
Known Q
Known Q (cfs)
= 0.33
Elev (ft) Section
102.00
101.50
101.00
100.50
100.00
99.50
Highlighted
Depth (ft)
Q (cfs)
Area (sqft)
Velocity (ft/s)
Wetted Perim (ft)
Crit Depth, Yc (ft)
Top Width (ft)
EGL (ft)
Friday, Aug 26 2022
= 0.22
= 0.330
= 0.24
= 1.36
= 2.24
= 0.20
= 2.20
= 0.25
Depth (ft)
2.00
1.50
1.00
0.50
_n Fn
1 1 2 3 4 5 6 7 8 9 10 11 12 vvV
Reach (ft)

Channel Report
Hydraflow Express Extension for Autodesk® AutoCAD® Civil 3D® by Autodesk, Inc.
S-16
Triangular
Side Slopes (z:1)
= 10.00, 10.00
Total Depth (ft)
= 1.00
Invert Elev (ft)
= 100.00
Slope (%)
= 2.50
N-Value
= 0.035
Calculations
Compute by:
Known Q
Known Q (cfs)
= 0.45
Elev (ft) Section
102.00
101.50
101.00
100.50
100.00
99.50
Highlighted
Depth (ft)
Q (cfs)
Area (sqft)
Velocity (ft/s)
Wetted Perim (ft)
Crit Depth, Yc (ft)
Top Width (ft)
EGL (ft)
Friday, Aug 26 2022
= 0.19
= 0.450
= 0.36
= 1.25
= 3.82
= 0.17
= 3.80
= 0.21
Depth (ft)
2.00
1.50
1.00
0.50
_n Fn
2 4 6 8 10 12 14 16 18 20 22 24 vvV
Reach (ft)

Channel Report
Hydraflow Express Extension for Autodesk® AutoCAD® Civil 3D® by Autodesk, Inc.
S-17
Triangular
Side Slopes (z:1)
= 4.00, 4.00
Total Depth (ft)
= 1.00
Invert Elev (ft)
= 100.00
Slope (%)
= 3.30
N-Value
= 0.035
Calculations
Compute by:
Known Q
Known Q (cfs)
= 0.37
Elev (ft) Section
102.00
101.50
101.00
100.50
100.00
99.50
Highlighted
Depth (ft)
Q (cfs)
Area (sqft)
Velocity (ft/s)
Wetted Perim (ft)
Crit Depth, Yc (ft)
Top Width (ft)
EGL (ft)
1 2 3 4 5 6
Reach (ft)
Friday, Aug 26 2022
= 0.23
= 0.370
= 0.21
= 1.75
= 1.90
= 0.23
= 1.84
= 0.28
Depth (ft)
2.00
1.50
1.00
0.50
_n Fn
7 8 9 10 vvV

Channel Report
Hydraflow Express Extension for Autodesk® AutoCAD® Civil 3D® by Autodesk, Inc.
S-18
Triangular
Side Slopes (z:1)
= 16.00, 16.00
Total Depth (ft)
= 1.00
Invert Elev (ft)
= 100.00
Slope (%)
= 5.00
N-Value
= 0.035
Calculations
Compute by:
Known Q
Known Q (cfs)
= 0.26
Elev (ft) Section
102.00
101.50
101.00
100.50
100.00
99.50
5 10 15 20 25
Reach (ft)
Highlighted
Depth (ft)
Q (cfs)
Area (sqft)
Velocity (ft/s)
Wetted Perim (ft)
Crit Depth, Yc (ft)
Top Width (ft)
EGL (ft)
Friday, Aug 26 2022
= 0.11
= 0.260
= 0.19
= 1.34
= 3.53
= 0.12
= 3.52
= 0.14
Depth (ft)
2.00
1.50
1.00
0.50
_n Fn
30 35 40 45 v vV