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A rainwater harvesting system collects water from a roof piped to a storage tank where it is then used either inside or outside a building. Designs range from a 22 Nov 2018 A full list of the laws for rainwater harvesting by each state supported by of rainwater collection, providing technical instructions and guidelines. . Rainwater harvesting is legal in Oregon, but may only be collected from aRainwater harvesting is the capture, diversion, and storage of rainwater collection system that includes a roof, gutters or roof In eastern Oregon, where rainfall is less than in the .. you can use some guidelines to help you decide what. Rainwater harvesting systems that incorporate the use of pumps to create a code requirements for harvesting rainwater by visiting www.portlandoregon. Rainwater Harvesting is exploding and so are the cities, states and other entities The City of Tucson, Arizona, has instituted requirements for water harvesting in its land .. In Oregon, only roof surfaces may be used for harvesting rainwater.