A simple graphical method for designing all types of partly full circular sewers is presented. The designing flow rate, velocity, partial depth of flow, and Manning coefficient of roughness are the input parameters for design procedure. The desired design parameters of gravity sewers (diameter and slope) that complying with the conditions of the Egyptian code could be easily estimated. Based on Manning equation two designing graphs for flow in sewers at depths of 67 and 75 percent of the pipe diameter were established. The first graph should be used for sewers having inner diameters up to 700 mm while the other for sewers with bigger diameters. Another graph was provided for estimating both the velocity and the partial depth of waste-water in all types of circular gravity sewers. The flow rate, the Manning coefficient of roughness, slope, and sewer’s diameter are considered as the leading parameters for using this nomograph. The feasibility, ease, and accuracy of this new graphical method were checked and assured by illustrative numerical examples.