Nalluri and Featherstone's Civil Engineering Hydraulics by Marriott Martin;

Author:Marriott, Martin; [Marriott, Martin]
Language: eng
Format: epub
ISBN: 9781118915660
Publisher: John Wiley & Sons, Incorporated
Published: 2016-03-09T00:00:00+00:00

(iii) Is the channel long enough to satisfy the above assumptions?

Identify the type of water surface profile based on the discharge, uniform flow depth and downstream lake level and compute its length. If the surface profile length is shorter than channel length, the channel is long enough and uniform flow does exist at the inlet (i.e. free inlet). If the profile length is longer than the channel length, the inlet will be drowned (short channel) and the discharge rate is reduced. To compute the actual discharge rate in a short channel, the following iterative procedure is to be followed:

(a) Assume Q < Q0 (since the inlet is drowned) and compute the corresponding flow depth at the inlet by the energy equation.

(b) Compute the new surface profile length corresponding to this discharge and verify whether it fits between the inlet depth and the downstream lake level.

(c) Repeat (a) and (b) until the profile length matches the channel length.

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