If the plumbing plans had the abbreviation DS on them, what does DS mean?

The abbreviation "DS" in plumbing plans commonly stands for "Down Spout." This refers to a vertical pipe that directs rainwater from a roof or other surface down to the ground or into a drainage system. Understanding the role of a down spout is crucial for ensuring proper water drainage from structures, thereby preventing issues such as flooding, water accumulation, or deterioration of building materials.

While there may be other plumbing or drainage terms associated with abbreviations, "Down Spout" is the most widely recognized meaning in the context of plumbing plans. The function and placement of down spouts are integral to effective drainage system design, which directly impacts the overall performance of a plumbing system in managing water runoff.