Water is yield. 
Every field is different.

_{Annual fees are calculated and invoiced for each field/block based on size in acres times the fee rate associated with the field/block size. For example, one field with two independently monitored blocks of 80-acres each would be 80 acres X $85/acre X 2 = $13, 600/year. A single independent 100 acre block would be 100 acres X $65/acre = $6,500/year. Pricing is for one management zone per block,}