A hose with diameter of 6 inches has cross-sectional area of [pi*r2] = pi*(3 in)2
1 foot = 12 inches, so (12 in)*pi*(3 in)2 = 339.292 cubic inches per linear foot of hose.
Since 1 gallon = 231 cubic inches, 339.292 cubic inches = 1.46880 gallons
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Volume of a cylinder = (pi) x (radius)2 x (length)Radius = half of the diameter = 1.395 mm1 foot = 304.8 mmVolume = (pi) x (1.395)2 x (304.8) = 1,863.43 cubic millimeters per foot.That's about 2,031 feet of hose to hold 1 gallon of fluid ... 2.79mm is an awfully skinny hose.
2.75 Imperial gallons.
The gallons per hour that come out of a hose depends upon two things: the diameter of the hose, and the water pressure. Since both of these vary, there is no single answer to that question. However, a one inch diameter garden hose at an average household water pressure could be expected to yield about 200 gallons per hour, in my estimation. Your mileage may vary.
Let me try and give you a hint. There is something called fluid flow formula. You basically need to know the speed at which the water is flowing and (in this case) the hose length and diameter. Well, it depends on how fast the water is running. Get a clock. Start filling a 10 liter bucket and stop after one minute. Is the bucket full (10 liters per minute), or half full (5 liters per minute)? Or did the bucket fill in half a minute (20 liters per minute)? The answer is in your hands (or in your bucket).
At 7.48 gallons per cubic foot that is 3.14x30x30/4x52 x7.48 /12 = 22,900 gallons