Question 1133171
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I will assume the contained area is 2.26 SQUARE feet....<br>
Use the given flow rate and the given amount of time to determine the number of cubic feet of water; the depth (in feet) is that volume of water, divided by the area.  Then convert the answer in feet to inches.<br>
The conversion can be accomplished using several unit multipliers.<br>
Volume of water in 12 minutes:<br><pre>
            10 qt     1 gal     8 pounds       1 cu ft
  12 min * ------- * ------- * ---------- * -------------
            2 min     4 qt        1 gal      62.4 pounds<br></pre>
Then divide by the area to get the depth in feet; then multiply by 12 to get the depth in inches.