Which of the following is not a water meter measurement capacity?

In the context of water meter measurement capacities, it is essential to recognize that water meters are designed to measure water flow at specific rates, often defined in gallons per minute (gpm). Each of the specified capacities—5 gpm, 10 gpm, 15 gpm, and 25 gpm—represents typical flow rates found in various applications, but one of these options does not commonly align with those standard capacities.

The selection of 10 gpm as a non-existent capacity in certain types of water meters reflects that while it may seem reasonable, it is not as frequently utilized or recognized as appropriate for specific models or standards. This lack of common application distinguishes it from the others, which are more typical for residential and commercial usage. In contrast, capacities like 5, 15, and 25 gpm are more prevalent and widely accepted in the industry due to their alignment with common plumbing applications and requirements. Thus, understanding these standard practices helps in recognizing which flow rates are operationally relevant in the field of plumbing.