2006-10-17 06:26:43 · 5 answers · asked by mustang.pass 2 in Science & Mathematics ➔ Mathematics
Well there are 43,500 sq ft per acre. and 4" is 1/3 of a foot so.
43500 (90/3) = 1,305,000 cubic feet of water
or around 9.76 million gallons. But depends on the land on how much run off you get. A paved parking lot would be 100%. Grass land might be only 75%.
2006-10-17 06:39:38 · answer #1 · answered by Roadkill 6 · 0⤊ 0⤋
We assume you want an estimate water. It is normally given in acre-ft or cubic feet.
Amount of water
=4"*90 acres=360acre-inch
=30 acre ft
=30*4840 sq.yard-ft
=30*4840*9 cubic ft
=1306800 cft
=1.306 million cft
2006-10-17 13:48:28 · answer #2 · answered by openpsychy 6 · 0⤊ 0⤋
4 inches
2006-10-17 15:15:41 · answer #3 · answered by Aaron 3 · 0⤊ 0⤋
9,775,542.85713099 US Gallons
That's almost 10 million Gallons.
2006-10-17 13:40:02 · answer #4 · answered by Anonymous · 0⤊ 0⤋
37,000,000 litres... more or less
unless I did the math wrong
that's about 9,774,365 gallons, btw
2006-10-17 13:41:09 · answer #5 · answered by Anonymous · 0⤊ 0⤋