Runoff Produced Per Square Foot Of Roof

The number of feet multiplied by 144 equals inches.

Runoff produced per square foot of roof.

To work out the surface area simply multiply the length in metres by width for square or rectangular roofs. Measure along the length of the house or building and along the width of the house or building in feet. Roof area ft2 x precipitation amount in x 0 623 amount collected gallons easy formula to remember. 216 000 square inches multiplied by 2 inches of rain yields 432 000 cubic inches of rain.

Although this calculation is simple in principle the units can make it a headache. Determine the footprint of your structure f in square feet. To calculate the runoff from any given rainfall. Multiply the two figures together to obtain the square footage of your roof.

However calctool s unit menus remove this issue doing all the unit conversion for you. If you get about 10 inches of rain over the course of the spring and summer an average 1 360 square foot roof would yield 8 160 gallons of rainwater. So a 50 x 20 roof is 600 x 240 multiply the roof dimensions by the number of inches of rainfall. Automatic overflow control directs water back to downspout when barrel is full.

But at 20 watts per square foot a system rated to produce 2 kilowatts would cover roughly 150 square feet while a 3kw system would take up about 225 square feet. 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. Take the dimensions of the footprint of your roof and convert them to inches. Since rainwater is collected from rooftops you will need to work out the total surface area of roof s that will be used to catch rainwater.

Because of the variables pinning down exact numbers is tough. 0 gallons per minute gpm 0 cubic feet per second cfs peak runoff volume. The answer is about 623 gallons. You have to admit that whether you re in a drought situation or not it s hard to pass up that much of a free thing.

For example if you have a roof that measures 1 500 square feet that equals 216 000 square 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. Rainfall calculator english units how much water falls during a storm. In this example we ll assume 2 inches of rain per hour.

0 inches per hour data source. So how many square feet of your roof will your pv solar system cover. Use our metric system version. 0 gallons 0 cubic feet.

Here you can easily find how much rainwater you can collect from you roof how much you need to remove from a courtyard or how much runoff you can expect from an area of land. Drainage pipe required minimum diameter.