How Much Rain Falls On Your Roof A Year

Use our metric system version.

How much rain falls on your roof a year.

1500 x 0 6 x 37 1 33 390 gallons a year. To calculate the runoff from any given rainfall. For example if you have a roof that measures 1 500 square feet that equals 216 000 square inches. Keep in mind most rain falls over 2 3 months of a year.

It isn t uncommon for an area to collect up to 350mm of rain in just one month even in rural areas. Just multiple the square footage of roof space you have available x 0 6 gallons per square foot per inch of rain and you can see how much water you can collect from each inch of rain that falls. This calculation assumes a 90 efficiency. In this example 600 x 240 x 1 144 000 cubic inches of water.

If you live in portland or your average rainfall is 37 07 inches and you have a 1500 square foot roof. For example on a 2 000 square foot roof you can collect 2 000 x 0 56 1 120 gallons inch of rain. You can enter numbers into any or all of the boxes below. Rain barrel supplies list.

Use square kilometers for large areas. Average rainfall for select cities. Use meters for areas such as your roof or yard. Rainfall calculator english units how much water falls during a storm.

When you look at the numbers it s surprising how much water you can collect every time it rains. So a 50 x 20 roof is 600 x 240 multiply the roof dimensions by the number of inches of rainfall. Select one or more methods to choose the size of your area. Just a half inch of rain falling on a 1 000 square foot roof will yield 300 gallons of water.

So if you have 2 500 square feet of roof available for water catchment and a single inch of rain falls one day we see that. Multiply the area of your roof by the amount of rainfall you wish to calculate for. I think you ll be surprised about much rain really does fall during a rainstorm. Take the dimensions of the footprint of your roof and convert them to inches.

It is the middle of july in georgia and both you and your tomatoes are wilting in your yard both looking to the sky and hoping for rain. 1 500 x 144 216 000 multiply those 216 000 square inches by the rainfall. The number of feet multiplied by 144 equals inches. To get an idea how much water the roof of your own house might yield use the rainfall harvest calculator above.