1 acre = 43,560 square feet
1 inch = 1/12 foot
Volume = 43,560 x 1/12 = 3,630 cubic feet = 27,154.3 gallons (rounded)
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First, convert acres to square feet . . . 43,560 sq ft. Then, convert 43,560 sq ft to sq inches . . . 43560 x 144 = 6,272,640 sq inches Then multiply that area by the 1 inch depth . . . 6,272,640 x 1 = 6,272,640 cubic inches of volume.
1 inch x 1 sq mile = 1 inch x 4,014,489,600 sq inches = 4,014,489,600 cubic inches = 65,785.7 m3 = 65,785,698 litres
There are far too many variables to say. The answer to this will be relative to your location, and you would need to take some measurements in your local area. The best way to calculate this would be to take a sample (say 1 foot square) and multiply your results by the number of square feet in one acre. A suggested means would be to use a rain gauge with a 1 foot square funnel, to measure total rain fallen on the area. then you would need to ascertain the drop size. I would use a sheet of tissue paper, weigh it, then allow it to be hit by a single drop of average size, and then re-weigh. 1 gram will equal 1 milliliter, and thus you can work out how many drops by dividing your total water in your sample area. You may want to use a normal rain gauge in addition to this in order to get an accurate idea of when you achieve a 1 inch rainfall.
a rain gauge is a little glass vile u stick outside and when it rains it fills it up to see how much rain u got a rain gauge is a little glass vile u stick outside and when it rains it fills it up to see how much rain u got
1 inch in 2 hours