Abstract :
In this paper the hydraulic design of peripheral channels for circular tanks is based on a solution of the gradually varied flow equation for spatially varied flow. The maximum depth of flow in the channel is obtained for a range of channel widths namely 300, 500, 750 and 1000 mm, channel bed slopes 0,0.2%, and 0.5%, surface loadings of 30, 50 and 70 m3/m2 d and tank sizes from 10 m diameter up to 40 m diameter. The results are presented in graphical and tabular form with the maximum depth of flow given for the complete range of tank diameters, surface loadings, channel widths and slopes. In addition, typical flow profiles are obtained which show that the maximum depth reduces with increasing bed slope of channel and the position of maximum depth moves downstream towards the outfall as the gradient increases from zero up to 0.5%.
