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1
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- Channel design based on use of Manning eq. to find normal depth Yo for a
specified discharge.
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2
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- Flow is fully developed rough turbulent.
- Channel is prismatic, i.e. cross-section is constant along length.
- Flow is uniform, i.e. Sf = S0.
- A0, P0, R0 = f(Y0, geometry).
- Cross-section is fixed boundary.
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3
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4
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5
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- Peak value of current Inflow
- hydrograph if one exists.
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6
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7
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8
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9
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10
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11
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- Design a trapezoidal channel to carry 2 c.m/s with gradient of 0.3% and
n=0.04
- Design a channel which includes a low flow channel to carry maximum flow
of 12 c.m/s and low flow of 2 c.m/s.
Allow freeboard of 0.3 m. Try for gradient = 0.3%, n=0.04 for
main channel and n=0.02 in low flow channel
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Notes