What is the standard unit of measurement for water flow?

The standard unit of measurement for water flow is often considered to be gallons per minute (GPM), especially in certain regions like the United States, where water flow rates are frequently expressed in this unit. GPM is particularly useful for assessing the performance of water delivery systems, plumbing fixtures, and irrigation methods, as it provides a clear and easily relatable measurement of how quickly water is being delivered or consumed.

While other units like liters per second, cubic meters per hour, and milliliters per minute are valid methods for measuring flow, GPM is widely recognized and used in various applications involving water flow in North America, making it the most practical choice in this context.