ABSTRACTThis study is the modification of Bauer's development length in order to determine the excess in his length which This study is the modification of Bauer's development length in order to determine the excess in his length which This study is the modification of Bauer's development length in order to determine the excess in his length which This study is the modification of Bauer's development length in order to determine the excess in his length which has not been investigated by earlier researchers. The observations were performed in the non has not been investigated by earlier researchers. The observations were performed in the non has not been investigated by earlier researchers. The observations were performed in the non has not been investigated by earlier researchers. The observations were performed in the non of wooden stepped spillway of wooden stepped spillway of wooden stepped spillway of wooden stepped spillway mo mo mo models fabricated and installed at the Hydraulics Laboratory of the Department of dels fabricated and installed at the Hydraulics Laboratory of the Department of dels fabricated and installed at the Hydraulics Laboratory of the Department of dels fabricated and installed at the Hydraulics Laboratory of the Department of Water Resources and Environmental Engineering Water Resources and Environmental Engineering Water Resources and Environmental Engineering Water Resources and Environmental Engineering experiments were conducted over three different chute geometry to determine experiments were conducted over three different chute geometry to determine experiments were conducted over three different chute geometry to determine experiments were conducted over three different chute geometry to determine were plotted on a drawing paper to a scale of 1:1 to obtained the development length in this study. were plotted on a drawing paper to a scale of 1:1 to obtained the development length in this study. were plotted on a drawing paper to a scale of 1:1 to obtained the development length in this study. were plotted on a drawing paper to a scale of 1:1 to obtained the development length in this study.

This research was performed to develop an inception model to be used over three different chute geometries which This research was performed to develop an inception model to be used over three different chute geometries which This research was performed to develop an inception model to be used over three different chute geometries which This research was performed to develop an inception model to be used over three different chute geometries which was not done by earlier researchers. was not done by earlier researchers. was not done by earlier researchers. was not done by earlier researchers. The inception parameters (roughness Froude number and sine of the chute The inception parameters (roughness Froude number and sine of the chute The inception parameters (roughness Froude number and sine of the chute The inception parameters (roughness Froude number and sine of the chute angles) were determined from the i angles) were determined from the i angles) were determined from the i angles) were determined from the inception data of Munta and Otun. These parameters were analysed using a nception data of Munta and Otun. These parameters were analysed using a nception data of Munta and Otun. These parameters were analysed using a nception 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 regression model to form the inception length equation in this study. The results showed that the inception length to regression model to form the inception length equation in this study. The results showed that the inception length to 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 Fro the roughness height increases with increase in both roughness Fro the roughness height increases with increase in both roughness Fro the roughness height increases with increase in both roughness Froude number and slope of the chute angle. The ude number and slope of the chute angle. The ude number and slope of the chute angle. The ude 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 results also indicated that for every unit discharge, inclined stepped chute type has the least length of inception results also indicated that for every unit discharge, inclined stepped chute type has the least length of inception 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 compared to the plain and the end compared to the plain and the end compared to the plain and the end-sill chute types; indicating that the point of inception has sill chute types; indicating that the point of inception has sill chute types; indicating that the point of inception has sill chute types; indicating that the point of ince...

ABSTRACTThe present investigation evaluates the influence of three different step chute geometry when skimming flow was The present investigation evaluates the influence of three different step chute geometry when skimming flow was The present investigation evaluates the influence of three different step chute geometry when skimming flow was The present investigation evaluates the influence of three different step chute geometry when skimming flow was allowed over them with the allowed over them with the allowed over them with the allowed over them with the aim aim aim aim of determining the aerated flow length which is a significant factor when of determining the aerated flow length which is a significant factor when of determining the aerated flow length which is a significant factor when of determining the aerated flow length which is a significant factor when developing empirical equations for estimating aeration efficiency of flow. developing empirical equations for estimating aeration efficiency of flow. developing empirical equations for estimating aeration efficiency of flow. developing empirical equations for estimating aeration efficiency of flow. conducted in the Hydraulics Laboratory of the Department of Water Resource conducted in the Hydraulics Laboratory of the Department of Water Resource conducted in the Hydraulics Laboratory of the Department of Water Resource conducted in the Hydraulics Laboratory of the Department of Water Resource Ahmadu Bello University Zaria Ahmadu Bello University Zaria Ahmadu Bello University Zaria Ahmadu Bello University Zaria----Nigeria to determined the aeration efficiency of flow over the three different chute Nigeria to determined the aeration efficiency of flow over the three different chute Nigeria to determined the aeration efficiency of flow over the three different chute Nigeria to determined the aeration efficiency of flow over the three different chute geometry at the water temperature T and at the standard temperature of 20 geometry at the water temperature T and at the standard temperature of 20 geometry at the water temperature T and at the standard temperature of 20 geometry at the water temperature T and at the standard temperature of 20 were were were were analysed using analysed using analysed using analysed using a a a a regression model regression model regression model regression model efficiency of flow efficiency of flow efficiency of flow efficiency of flow for the three chute geometry under consideration. The results revealed that the aeration efficiency for the three chute geometry under consideration. The results revealed that the aeration efficiency for the three chute geometry under consideration. The results revealed that the aeration efficiency for the three chute geometry under consideration. The results revealed that the aeration efficiency increases with an increased in the increases with an increased in the increases with an increased in the increases with an increased in the length of aeration length of aera...