The point of a plumbing riser diagram is to separate out plumbing systems for potable water, waste water, storm water, sewage, and so on to be able to identify exactly where the different piping is located and what it is attached to in terms of appliances, drains, other building systems, and so on. There is, of course, a lot more to plumbing engineering than we have mentioned here. Nearby Engineers has a trained team of professionals to work on the full range of projects. Call for a consultation to see how we can help you.