By Stephanie Norton (via caddetails.com)
“Active” systems for harvesting rainwater use pipes, tanks and pumps for collecting, filtering, storing and recycling water that would otherwise be sent to municipal sewer or storm water systems. These are differentiated from passive harvesting systems which detain rainwater in vegetated swales, rain gardens, green roofs or permeable pavements so that it can infiltrate naturally back into the soil.
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Nice post. To collect the excess water from the roof gardens drainage composite sheets may be used
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