Where Does The Rainwater Go From My Roof

Take the dimensions of the footprint of your roof and convert them to inches.

Where does the rainwater go from my roof.

Minimizing water intrusion through roof vents in high wind regions 2 of 8 r 7 oofing 12 10 mitigation guidance soffit vents key issues n it is important to keep the soffit ma terial in place. Collect from any roof material except unsealed asbestos. Gutters and a downspout. For example most ranch style homes have a 3 12 or 4 12 pitch roof.

So a 50 x 20 roof is 600 x 240 multiply the roof dimensions by the number of inches of rainfall. Any trees touching or hanging over the roof should be trimmed back. Dirt and germs can be washed into collected rainwater from the roof especially when rain follows several days of dry weather 3 4 9. Just a half inch of rain falling on a 1 000 square foot roof will yield 300 gallons of water.

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. When the roof shingles do not extend past the metal drip edge the water will suck back on the metal drip edge this is called capillary action and run behind your gutters. Sizing a roof water drain. The first step in sizing a roof drain is to calculate the surface area of the roof that the drains will be covering as well as the average hourly rainfall rate at the building location.

Adding chlorine or iodine to water does not protect against chemicals and some parasites are very chlorine tolerant. Rain barrels for example do not provide any type of disinfection or filtration. Capillary action is a water activity in which water adheres to a surface and follow the surface. The next step is to determine each roof area that will be served by a separate leader drain pipe scupper or downspout.

Rain barrel supplies list. Make sure your roof is free of debris and does not hold or collect water. Rainwater can be collected from most roof types depending on the quality of rainwater required. A rain gutter eavestrough eaves shoot or surface water collection channel is a component of a water discharge system for a building.

In a charged line rainwater system the water is pushed into the tank by water pressure in the pipe. After a big storm or a long snowy spell always check. To get an idea how much water the roof of your own house might yield use the rainfall harvest calculator above. Ensure all gutters fall towards the outlets.

For garden or lawn irrigation.