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현재 위치

Designing an rectangular open channel to convey the discharge Q (Manning's formula)

작성자 Uploader : a.c.e. 작성일 Upload Date: 2018-08-30변경일 Update Date: 2018-08-31조회수 View : 420

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By Manning's formula for mean flow velocity, one may determine the dimensions of a rectangular open channel to convey a given discharge Q.

□ Variables description

- Design discharge : Q (m^3/s)
- Water depth : h (m)
- Channel breadth : b (m)
- Channel slope (or energy gradient) : S
- Manning's roughness coefficient : n
- Cross-sectional area (flow area) : A(m^2)
- Wetted perimeter : P (m)
- Hydraulic radius : R (m)
- Calculated discharge : Qc (m^3/s)

▷ Input data

First, assuming the water depth h(m), calculate the flow area A (m^2).

The hydraulic radius is R = A/P = b*h / (b+2h),

Applying the Manning's formula,

Calculated discharge : Qc = A*V,

By increasing or decreasing the water depth h in the equation no.2, iterate the calculation until the calculated discharge Qc becomes equal to the design discharge Q.

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현재 위치

Designing an rectangular open channel to convey the discharge Q (Manning's formula)

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