SW6240503_Design Calculations_20240606

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EXHIBIT
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PRELIMINARY DRAWING-NOT RELEASED FOR CONSTRUCTION

Project: Sawyer Ridge
Date: 04/16/2024
Channel Design
TRAPEZOIDAL SHAPE
— T
� d
Channel Location: Roadside Swale A
Estimate 10-yr Peak Runoff:
Rational C 0.50
Intensity(in/hr) 7.08
Drainage Area 1.76 ac
Qio 6.23 cfs
Additional Flow 0.00 cfs
Qio Total, Qdesign 6.23 cfs
Channel Information:
Channel Bottom Width, b 0.0 ft
Side Slope(x:1) 2.0
Channel Slope, S 0.006 ft/ft
Flow Depth, d 1.20 ft
Selected Channel Lining:
Selected Channel Lining American Excelsior Curlex 1
Maximum Permissible Velocity{Vmax}(fps) 7
Permissible Shear Stress{tp}(psf) 1.75
Calculations:
e 2.4 ft
Side Slope Length, m 2.7 ft
Top Width, T 4.8 ft
Channel Area,A 2.88 sq ft
Wetted Perimeter, Pw 5.37 ft
Hydraulic Radius, Rh 0.54 ft
Mannings"n" 0.035
Calculated Flow Rate, Qcaic 6.27 cfs
Calculated Velocity, Vcaic 2.18 fps
Calculated Shear Stress, tcaic 0.45 psf
V calc<_V max? yes
tcalc<_tp? yes

Project: Sawyer Ridge
Date: 04/16/2024
Channel Design
TRAPEZOIDAL SHAPE
T
m
Channel Location: Roadside Swale B
Estimate 10-yr Peak Runoff:
Rational C 0.80
Intensity(in/hr) 7.08
Drainage Area 0.40 ac
Qio 2.27 cfs
Additional Flow 0.00 cfs
Qio Total, Qdesign 2.27 cfs
Channel Information:
Channel Bottom Width, b 0.0 ft
Side Slope(x:1) 2.0
Channel Slope, S 0.006 ft/ft
Flow Depth, d 0.82 ft
Selected Channel Lining:
Selected Channel Lining American Excelsior Curlex 1
Maximum Permissible Velocity{Vmax}(fps) 7
Permissible Shear Stress{tp}(psf) 1.75
Calculations:
e 1.6 ft
Side Slope Length, m 1.8 ft
Top Width, T 3.3 ft
Channel Area,A 1.34 sq ft
Wetted Perimeter, Pw 3.67 ft
Hydraulic Radius, Rh 0.37 ft
Mannings"n" 0.035
Calculated Flow Rate, Qcaic 2.27 cfs
Calculated Velocity, Vcaic 1.69 fps
Calculated Shear Stress, tcaic 0.31 psf
V calc<_V max? yes
tcalc<_tp? yes