Rainwater Collection Off Roof

1 of rain on 1 000 sf roof will yield 623 gallons.

Rainwater collection off roof.

Doesn t that sound like a lot of water that you could harvest and use for free. Dirt and germs can be washed into collected rainwater from the roof especially when rain follows several days of dry weather 3 4 9. Around 600 gallons of rainwater can be harvested from about one inch of rain if it falls from a thousand square foot roof. Roof area m2 x precipitation amount mm amount collected liters.

New information is available about rainwater harvesting from composition roofs. Roof area ft2 x precipitation amount in x 0 623 amount collected gallons easy formula to remember. Collecting rainwater is a technique that has been practiced for centuries as an environmentally friendly method to collect rain for distribution in gardens and across landscaping. That is why my husband and i began harvesting our rainwater.

Typically a roof acts as the main collection source. A high quality enameled roofing material that is easy to clean standing seam metal offers the highest collection efficiency available. Today houses are built with roof gardens that naturally absorb the rain and grow an insulating layer of grass. Just a half inch of rain falling on a 1 000 square foot roof will yield 300 gallons of water.

And this is when it is operating at its least efficient rate of purification at 32 degrees f. Rainwater collection calculation formulas and equations. Rain barrels for example do not provide any type of disinfection or filtration. Rainwater collection in off grid systems is one way to feed your supply.

It can also allow you to keep your expenses down and even reduce your carbon footprint. The rain will collect in gutters that channel the water into downspouts and then into some sort of storage vessel. Rainwater harvesting is collecting the run off from a structure or other impervious surface in order to store it for later use. Traditionally this involves harvesting the rain from a roof.

Well we thought so too. When you look at the numbers it s surprising how much water you can collect every time it rains. If you re installing a new roof for the purpose of collecting rainwater standing seam metal may very well be your best choice. Rain barrel supplies list.

To get an idea how much water the roof of your own house might yield use the rainfall harvest calculator above.