CREATING A NEW CRITICAL DEPTH EQUATION FOR GRADUALLY VARIED FLOW IN CIRCULAR SECTION

Drawing the water surfaces in open-channel for gradually varied flow is relatively complicated and difficult. In order to identify which type of the water surfaces among 12 water-surface styles we have to base on critical depth (yc) and normal depth (yo). In this case, to calculate the critical depth (yc) that particularly need to use the Semi empirical equations. This article generally the way to compute the critical depth; the way to compute flow in circular sewers; analyze the application of existing formulas and then offering a new equation to compute the critical depth. This new equation will help to have more accurate result. Also it is more comfortable to non-uniform flow in the circular section/ circular sewers