The board may, at the time of fixing the ground water charge, establish a method or methods to be used in computing the amount of water produced from a water-producing facility which is not measured by a measuring device.
Such methods may be based upon any or all or a combination of the following criteria:
(a)
The size of water-producing facility discharge opening.
(b)
The area served by the water-producing facility.
(c)
The number of persons served by the water-producing facility.
(d)
The use of land served by the water-producing facility.
(e)
The crops grown on land served by the water-producing facility.
(f)
Any other criteria which may be used to determine with reasonable accuracy the amount of water produced from a water-producing facility.