Runoff Produced Per Square Foot Of Roof

Calculate surface area of your roof.

Runoff produced per square foot of roof. 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. In this example we ll assume 2 inches of rain per hour. For example if you have a roof that measures 1 500 square feet that equals 216 000 square inches. 0 inches per hour data source.

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. 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. 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. Rainfall calculator english units how much water falls during a storm.

0 gallons per minute gpm 0 cubic feet per second cfs peak runoff volume. To calculate the runoff from any given rainfall. Determine the footprint of your structure f in square feet. The number of feet multiplied by 144 equals inches.

Use our metric system version. Measure along the length of the house or building and along the width of the house or building in 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. Because of the variables pinning down exact numbers is tough.

216 000 square inches multiplied by 2 inches of rain yields 432 000 cubic inches of rain. Take the dimensions of the footprint of your roof and convert them to inches. So how many square feet of your roof will your pv solar system cover. The answer is about 623 gallons.

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. Although this calculation is simple in principle the units can make it a headache. 1 500 x 144 216 000 multiply those 216 000 square inches by the rainfall. Automatic overflow control directs water back to downspout when barrel is full.

Roof area ft2 x precipitation amount in x 0 623 amount collected gallons easy formula to remember. So a 50 x 20 roof is 600 x 240 multiply the roof dimensions by the number of inches of rainfall. 0 gallons 0 cubic feet. However calctool s unit menus remove this issue doing all the unit conversion for you.

Drainage pipe required minimum diameter. Multiply the two figures together to obtain the square footage of your roof.