In an area that gets 39 inches of rain annually (an average amount for different parts of the country) the amount of rainwater that would run off a double-stalled run-in shed in one year is 14,000 gallons!
(an area; gets; 39 inches of rain; T:annually) (the amount of rainwater; would run off; a double-stalled run-in shed; T:in one year) (the amount of rainwater that would run off a double-stalled run-in shed in one year; is; 14,000 gallons; L:In an area)
an area the amount of rainwater the amount of rainwater that would run off a double-stalled run-in shed in one year
gets would run off is
39 inches of rain T:annually
a double-stalled run-in shed T:in one year
14,000 gallons L:In an area