Question 130407
1 square mile, 1 inch deep = {{{5280*5280*(1/12)=2323000}}} cubic feet.  Water weighs approximately  62.43 lbs/cubic foot, so the rain water weighs roughly 145037376 lbs, or about 73 thousand tons.  Contrast this to the displacement of the aircraft carrier USS John F. Kennedy, about 83,000 tons fully loaded, or 61,000 tons when empty.