You are understanding correctly, but instead of using the words that you used, I would say “indicators”. They have indicators--very simple things to understand--between zero and one. If they are at six, for example, then you are overusing the water. Of course, the indicators contain a lot of the questions, but for the public, you can go there and find out the state of the water circling or going over.
On June 9th, 2009. See this statement in context.