online_transition_design calculator  •  [Beta version 151115]  •  (Best viewed with Firefox ≥ 42.0)


Ponce, V. M. 2015:  Design of channel transitions.
Online report.

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Typical designs  ⇒

DESCRIPTION         [Example]         [Main Page]

This online calculator designs a warped transition following the example described originally in Hinds (1928) and complemented by Chow (1959). Details of the computational procedure have been presented by Ponce (2015).


Currently, only the U.S. Customary system of units is available. SI (metric) units will be available in the near future.

Type of transition

Currently only the warped inlet transition is available. The warped outlet will be available in the near future.

Shape of transition

The shape of the transition may be specified in one of three ways:

  1. By using default internal paired arrays of half top width and half bottom width, as given by Chow (1959) and Ponce (2015). Note that this choice of shape only applies to the featured Hinds/Chow inlet example.

  2. By calculating half top widths and half bottom widths to fit two equal inverse parabolas, pieced together at midpoint of the transition, positioned in such a way that the forward parabola is tangent to the flow at the end of the canal (the upstream end of the transition), and the backward parabola is tangent to the flow at the start of the flume (the downstream end of the transition).

  3. As paired input arrays of half-top widths and half-bottom widths, for each of eleven (11) cross sections, at equidistances, from upstream to downstream, along the length of the transition. According to Chow (1959), for any given case, these input arrays may be chosen arbitrarily or by trial.


Chow, V. T. 1959. Open-channel hydraulics. McGraw-Hill, New York.

Hinds, J. 1928. The hydraulic design of flume and siphon transitions. Transactions, American Society of Civil Engineers, Vol. 92, 14-23-1459.

Ponce, V. M. 2015. Design of channel transitions. Online report.

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