Runoff Produced Per Square Foot Of Roof

Roof area ft2 x precipitation amount in x 0 623 amount collected gallons easy formula to remember.

Runoff produced per square foot of roof.

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 of rain on 1 000 sf roof will yield 623 gallons roof area m2 x precipitation amount mm amount collected liters other water conservation calculators. Determine the footprint of your structure f in square feet. Drainage pipe required minimum diameter.

To calculate the runoff from any given rainfall. 0 gallons per minute gpm 0 cubic feet per second cfs peak runoff volume. Although this calculation is simple in principle the units can make it a headache. Multiply the two figures together to obtain the square footage of your roof.

For example if you have a roof that measures 1 500 square feet that equals 216 000 square inches. 216 000 square inches multiplied by 2 inches of rain yields 432 000 cubic inches of rain. Use our metric system version. In this example we ll assume 2 inches of rain per hour.

Automatic overflow control directs water back to downspout when barrel is full. 1 500 x 144 216 000 multiply those 216 000 square inches by the rainfall. 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.

The answer is about 623 gallons. 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. 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.

To work out the surface area simply multiply the length in metres by width for square or rectangular roofs. So a 50 x 20 roof is 600 x 240 multiply the roof dimensions by the number of inches of rainfall. 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. Measure along the length of the house or building and along the width of the house or building in feet.

0 gallons 0 cubic feet. Rainfall calculator english units how much water falls during a storm. However calctool s unit menus remove this issue doing all the unit conversion for you. Calculate surface area of your roof.

The number of feet multiplied by 144 equals inches. 0 inches per hour data source.