A more thorough explanation:

A miner's inch is a unit of measurement used to determine the amount of water discharge. It is equivalent to nine gallons per minute flowing from a one-inch-square pipe. However, the exact measurement of a miner's inch may vary depending on the location.

• John's gold mine uses water from a nearby river. He has a water right of one miner's inch, which means he can use nine gallons of water per minute for his mining operations.
• In California, a miner's inch is defined as 1/40th of a cubic foot per second. This means that a flow of 40 miner's inches is equal to one cubic foot per second.

These examples illustrate how a miner's inch is used to measure the amount of water flow. It is a crucial unit of measurement for mining operations, irrigation, and water rights. Understanding the precise measurement of a miner's inch is essential for managing water resources effectively.