Rain Collection Roofs

For every 1 of rain and 100 square feet of impermeable surface about 62 gallons are generated.

Rain collection roofs.

To get an idea how much water the roof of your own house might yield use the rainfall harvest calculator above. Don t let all that water go to waste. Your roof needs to be able to withstand the weight of heavy snow and rain. Did you know the average roof collects 600 gallons 2 271 2 l of water for every inch of rainfall.

Greenhouse roof has the highest collection efficiency most surfaces are a ok. 50 sq ft 31 gallons. 100 sq ft 62 gallons. Rainwater collection calculation formulas and equations roof area ft 2 x precipitation amount in x 0 623 amount collected gallons easy formula to remember.

There s just a short list of rooftop surfaces that rainwater harvesters should avoid. When you look at the numbers it s surprising how much water you can collect every time it rains. Sample rainwater harvesting formula. Here s a handy little calculator to help you estimate how much rainwater can you harvest from your roof.

Read down the list for info on roofing materials for rainwater harvesting. Research indicates rainwater is safe for irrigating vegetables read the recent research from australia and wa dept. You can make a rainwater collection system for under a hundred dollars and store hundreds of gallons of water to use for your garden or other purposes. Example for every 1 of rain.

Rainwater collection in washington state outlines the department of ecology s 2009 policy decision allowing rainwater collection and reuse systems and has many useful links. The medium sized rain water collection system. Metal roofs for rainwater collection. While metal roofing or plastic sheeting e g.

To use this calculator input the dimensions of your roof only area connected to rainwater harvesting system and the amount of rainfall in inches. Rainwater collection systems can be as simple as collecting rain in a rain barrel or as elaborate as harvesting rainwater into large cisterns to supply your entire. Collecting the rainwater that runs off your roof is a great way to conserve an important natural resource. When designing a rainwater collection you have to consider its durability.

Just a half inch of rain falling on a 1 000 square foot roof will yield 300 gallons of water. Traditionally this involves harvesting the rain from a roof. Rain barrel supplies list. Water is often in short supply in the heat of summer so it s tempting to use roof runoff.

1 of rain on 1 000 sf roof will yield 623 gallons. The rain will collect in gutters that channel the water into downspouts and then into some sort of storage vessel.