The board shall, before the levy of the ground water charge, find and determine all of the following:

1. (a) The average annual overdraft for the immediate past 10 water years.
2. (b) The estimated annual overdraft for the current water year.
3. (c) The estimated annual overdraft for the ensuing water year.
4. (d) The accumulated overdraft as of the last day of the preceding water year.
5. (e) The estimated accumulated overdraft as of the last day of the current water year.
6. (f) The estimated amount of agricultural water to be withdrawn from the ground water supplies of the district for the ensuing water year.
7. (g) The amount of water other than agricultural water to be drawn from the ground water supplies of the district for the ensuing water year.
8. (h) The estimated amount of water necessary for surface distribution for the ensuing water year.
9. (i) The amount of water which is necessary for the replenishment of the ground water supplies of the district.
10. (j) The amount of water the district is obligated by contract to purchase.