What type of water source typically uses velocity meters for flow measurement?

Velocity meters are commonly used for flow measurement in municipal water systems. These devices measure the speed of water flowing through a pipe or channel and convert that velocity into a flow rate. Municipal water systems often involve the distribution of treated water that can be accurately measured for billing and operational management.

Surface water, such as rivers and streams, typically utilizes different measurement devices, such as weirs or flumes, due to the nature and variability of water flow in open channels. Groundwater flow measurement relies on other methods, often involving well measurements and piezometers. Rainwater collection does not usually involve a constant flow measurement system like those found in municipal water networks. Therefore, municipal water stands out as the correct context where velocity meters are primarily applicable for flow measurement.