Gallons Of Water On Roof
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So a 50 x 20 roof is 600 x 240 multiply the roof dimensions by the number of inches of rainfall.
Gallons of water on roof. If your average rainfall was 25 inches year your annual collection potential is 1 120 x 25 28 000 gallons year. For example on a 2 000 square foot roof you can collect 2 000 x 0 56 1 120 gallons inch of rain. Simply take your roof s square footage and multiply by 62. Roof area m2 x precipitation amount mm amount collected liters.
To find how much rain you can collect in an average rain year multiply this number by the average inches of rain. This means that each square foot captures about 62 gallons per inch of rain. In this example 600 x 240 x 1 144 000 cubic inches of water divide by 231 to get the number of gallons because 1 gallon 231 cubic inches. Rainwater can be collected from the roofs using the rain water harvesting method.
Required roof drainage flow rate in gallons per minute 0 0104 x rainfall rate x roof area where rainfall rate is expressed in inches per hour and roof area is given in square feet. For every 1 inch of rain and 1 000 square feet of roof you capture about 620 gallons of water. 1 of rain on 1 000 sf roof will yield 623 gallons. Rainwater collection calculator in gallons.
Rainwater collection calculation formulas and equations. To calculate the runoff from any given rainfall. The answer is about 623 gallons. 1 inch of rainfall in an hour will cover 1 sq ft.
Converting this to gallons per minute per square foot gpm ft 2. How much will your roof be able to capture. Roof area ft2 x precipitation amount in x 0 623 amount collected gallons easy formula to remember.
A Residential Roof Can Have Up To 1000 Gallons Of Rain Water Pour Off Of It In Just A Single Storm Imagine What Kind Of Water Gallon Severe Storms Rainfall
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