how do you convert avrage rain fall in inches to gallons per minute?

Answer 1

average of what
gallons DIVIDED BY 231 cubic inches... you cant do it
...

Answer 2

To answer this question, you need the size of the collection surface. You also need the amount of time that the rain is falling.

If A=square inches of collection surface
and R=inches of rain per minute
then Q=gallons per minute

Q=A*R*0.00433

That last number is just a conversion between cubic inches and gallons. I'll leave it to you to figure out the collection area and the rain fall per minute.

Answer 3

first you have to choose your area

like, your front yard, or the state of texas, or whatever

when you have the square foot area of the place the rain is falling on (say your front yard at 20,000 sq ft) then you can multiply the inches of rainfall (say maybe 36 inches, divide the inches by 12 first to get feet of rainfall so your units stay straight, and thats 3 feet) times the area to get the amount of water total in cubic feet

20,000*3=60,000 cubic feet (in my example)

convert to gallons (7.48 gallons in each cubic foot)
7.48 * 60,000 = 448800 gallons

you then need to have a time (average annual rainfall? or this afternoon's rainfall? I'll assume that it is annual rainfall)

so that is 365 days * 24 hours/day * 60 minutes/hr = 525600 minutes

get the gallons, divide by minutes, you get gallons/minute

.85 gallons/min

so, unless I have messed up the arithmetic somewhere (and I know you are checking the calculations, right?) this means that if you have a 20000 sq foot front yard in a place that gets 36 inches average annual rainfall, you are getting the same amount of rain as you would get if all year long you had a steady flow of .85 gal/min

cool huh?

Answer 4

You need to know the time period the average is over (call it t), and you need to know the area (call it A) over which you would collect the rain to calculate the gallons.

Work out how many minutes in the time period - e.g. if it is an hourly average, there are sixty minutes in an hour. Then you need to work out how many square inches there are in your area. If you're looking at a square foot, that's 144 square inches. If you're looking at ten square miles, you can do the math.

Now multiply the number of square inches in your area, by the number of inches that fall in your time period. That gives you the number of cubic inches that fall in your time period. Divide by the number of minutes in your time period. That gives you cubic inches per minute. FInally you need to convert to gallons per minute, by dividing by 231.

In a formula, if you have an average of x inches fall in t minutes, over an area of A square inches then you have (x * A) / (231* t) gallons per minute falling in that area.

Answer 5

Since inches is a linear measurement and gallons is a measurement of volume it is also necessary to know what area you want to calculate IE. square feet, yards etc. A US gallon is .134 cubic feet or 231 cubic inches and 7.5 gallons = 1 cubic foot. Therefor a square foot (144 square inches) filled to a depth of 1.6 inches would contain approximately 1 US gallon.

Answer 6

in case you mean CUBIC ft, that is achieved, in any different case that is hopeless, for you are able to no longer convert volumetric pass fee to velocity. a million cubic foot is approximately 7.481 gallons. So a million gallon is a million/7.481 cubic ft. Then, a million gallon in line with minute could replace right into a million/7.481 cubic ft in 60 seconds, which skill a million gpm equals 0.0022278 CUBIC ft in line with 2d. it somewhat is the case for US gallons, in spite of the indisputable fact that. in case you meant British gallons, replace 7.481 for 6.23.

Answer 7

Use Google calculator.

Answer 8

find out how many cu in in a gal and div by time..