A plumbing drawing, a type of technical drawing, shows the system of piping for fresh water going into the building and waste going out, both solid and liquid. It also includes fuel gas drawings. Mainly plumbing drawing consist of Water supply system drawings, Drainage system drawings, Irrigation system drawings, Storm water system drawings. In water supply system drawing there will be hot water piping and cold water piping and hot water return piping also. In drainage system drawings there will be waste piping , Soil piping and vent piping. The set of drawing of each system like water supply , drainage etc is consist of Plans, Riser diagram, Installation details, Legends, Notes. Every pipes should me marked with pipe sizes. If the drawing is detailed , fixture units also should be marked along with the pipe. If it is shop drawing, sections also should be shown where there pipes are crossing. Each pipes with different purposes will be displayed with different colors for ease of understanding. Drainage pipes should be shown with slope.