Abstract
This research was performed to develop an inception model to be used over three different chute geometries which was not done by earlier researchers. The inception parameters (roughness Froude number and sine of the chute angles) were determined from the inception data of Munta and Otun. These parameters were analysed using a regression model to form the inception length equation in this study. The results showed that the inception length to the roughness height increases with increase in both roughness Froude number and slope of the chute angle. The results also indicated that for every unit discharge, inclined stepped chute type has the least length of inception compared to the plain and the end-sill chute types; indicating that the point of inception has shifted optimally upstream of the chute in the inclined stepped chute. The developed inception model has insignificant error range values of 0.044-0.89% over the various step chutes under consideration. Inclined step chute is more suitable to be used to safely transmit flood flow downstream of a dam. http://dx.doi.org/10.4314/njt.v34i3.29
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