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Manning’s Equation

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 concrete 0.020 earth 0.022 streams 0.045 pipe 0.013. A = Cross-sectional area of flow

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Manning’s Equation

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  1. CE EN 270 – BRIGHAM YOUNG UNIVERSITY Manning’s Equation

  2. Open Channel Flow

  3. Open Channel Flow

  4. Manning’s Equation • Q = Flow rate • u = 1.0 (metric) or 1.49 (English) • n = Manning friction factor • concrete 0.020 • earth 0.022 • streams0.045 • pipe 0.013 A = Cross-sectional area of flow Rh= Hydraulic radius = A/Pw Pw = Wetted Perimeter So = Slope of channel bottom

  5. Trapezoidal Channel

  6. Rectangular Channel

  7. Circular Channel If y<r: If y≥r:

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