How To Harvest Rainwater From Roof

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How to harvest rainwater from roof.

To use this calculator input the dimensions of your roof only area connected to rainwater harvesting system and the amount of rainfall in inches. For a roof with no gutters position your barrel under the valley of the roof where two sloped planes meet use a decorative rain chain to get water into your barrel. Rainwater harvesting is collecting the run off from a structure or other impervious surface in order to store it for later use. If you re thinking about rainwater harvesting also known as roof water harvesting you may be wondering about the best roofing materials for rainwater collection.

How to harvest rainwater from your home. The rain will collect in gutters that channel the water into downspouts and then into some sort of storage vessel. Make a rain barrel if you have gutters and downspouts on your house or garage you have a fantastic system for harvesting soft clear rainwater for the garden. Annual rainfall in millimetres x roof surface area in square metres roof catchment capacity.

Catchment surface the catchment surface refers to the roof which will collect rainwater. It is likely that your home will already be fitted with guttering around the edge of the roof and a downspout which will carry the water that falls on your roof down to the ground. Modify an existing downspout to divert water into your rain barrel. Just lay the tarp out on an elevated area and run a drainpipe from the lowest corner to a collection tank.

The only missing piece is a collection reservoir otherwise known as a rain barrel. This is an important figure to understand so you can design a rain harvesting system and choose a tank size that will meet your water volume requirements. This capacity can be calculated using the following formula. Traditionally this involves harvesting the rain from a roof.

Generally the bigger the better as more square footage will allow you to store more rainwater. To collect rainwater you can attach a rain barrel to your home s downspout so when it rains the water flows directly into the barrel. The catchment surface is one of the most important parts of harvesting rainwater. Try harvested rainwater for any non potable application.

Whether you re working with existing conditions or spec ing out a brand new roof we ve got expert advice for you. You will need 7 basic components to harvest rainwater.