This drawing is the water supply and drainage design and construction drawing of No. 7 residential building in a certain area, including water supply and drainage design description, water supply and drainage system drawing, house type detail drawing, water supply and drainage plan of each floor, water supply and drainage plan of ladder top and roof framework, water supply and drainage plan of machine room, etc. The content is detailed, the layout is reasonable, and the size is clear, which can be used for reference by relevant designers.