What determines the quantity of water flowing in a pipe?

• A. Water Hammer
• B. Pipe Size
• C. Water Source
• D. Surge Pressure

Answer: (B)

The amount of water that can move through a pipe is limited by the pipe’s ability to carry it, which comes down to its cross‑sectional area. Flow rate depends on how much area water can pass through per unit time; a larger pipe provides more area and, for the same driving pressure, allows more water to flow. In other words, pipe size sets the system’s capacity to convey water.

Water hammer and surge pressure are about pressure changes that occur when flow is started or stopped abruptly; they affect pressure dynamics, not the steady amount of water a pipe can carry. The water source supplies potential water, but the actual flow rate in the pipe is constrained by the pipe’s size.