Rain Water Harvesting From Roof

While metal roofing or plastic sheeting e g.

Rain water harvesting from roof.

Roof material the material of the roof is not as important as contaminants that may be on the roof. That is why my husband and i began harvesting our rainwater. There s just a short list of rooftop surfaces that rainwater harvesters should avoid. Around 600 gallons of rainwater can be harvested from about one inch of rain if it falls from a thousand square foot roof.

New information is available about rainwater harvesting from composition roofs. For the vast majority of tank based rainwater harvesting systems the catchment area is the roof surface. However collecting rainwater for landscaping purposes would require a license. The good news is most roofing materials are suitable for rainwater harvesting.

Rainwater harvesting is collecting the run off from a structure or other impervious surface in order to store it for later use. This capacity can be calculated using the following formula. Doesn t that sound like a lot of water that you could harvest and use for free. Well we thought so too.

Rainwater harvesting coming from your roof is fine in california. Greenhouse roof has the highest collection efficiency most surfaces are a ok. Rainwater harvesting is a technology used to collect convey and store rain for later use from relatively clean surfaces such as a roof land surface or rock catchment. Give your rain barrel a thorough scrub at the.

Roughly speaking 1 millimetre of rain over 1 square metre of roof equals 1 litre of water. There are some important factors about the roof to consider when planning for a rwh system. The rain will collect in gutters that channel the water into downspouts and then into some sort of storage vessel. The water is generally stored in a rainwater tank or directed to recharge groundwater.

The first few gallons of water that runs off the roof contain the majority of the contaminants and setting it aside makes the rest of the water safer. No permit from the state board is necessary. Annual rainfall in millimetres x roof surface area in square metres roof catchment capacity.