Manning’s Equation
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Manning’s Equation CE EN 270 – BRIGHAM YOUNG UNIVERSITY
description
CE EN 270 – BRIGHAM YOUNG UNIVERSITY. Manning’s Equation. Open Channel Flow. Open Channel Flow. Manning’s Equation. Q = Flow rate u = 1.0 (metric) or 1.49 (English) n = Manning friction factor concrete0.020 earth 0.022 streams 0.045 pipe 0.013. A = Cross-sectional area of flow - PowerPoint PPT Presentation
Transcript of Manning’s Equation
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Manning’s EquationCE EN 270 – BRIGHAM YOUNG UNIVERSITY
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Open Channel Flow
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Open Channel Flow
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Manning’s Equation
2/1o
3/2h SAR
nuQ
Q = Flow rateu = 1.0 (metric) or 1.49 (English)n = Manning friction factor
concrete0.020earth 0.022streams 0.045pipe 0.013
A = Cross-sectional area of flowRh = Hydraulic radius = A/Pw
Pw = Wetted PerimeterSo = Slope of channel bottom
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Trapezoidal Channel
b
yPw z
1A
zyybA 22
w z1y2bP
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Rectangular Channel
b
yPw A
ybA
y2bPw
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Circular Channel
2Dsin81A
D21Pw
ryrsin2 1
rrysin2 1
If y<r:
If y≥r:
b
q rh
yD
Pw