From our years of experience landscaping Lake Oswego and Portland, we can tell you that rainwater harvesting systems are highly beneficial, even in a moist climate like the Pacific Northwest. Yes, for much of the year rainwater harvesting systems in Portland-area homes will over-collect. At these times, the excess water can be diverted onto a permeable surface, where it will drain away slowly into the city watershed. Even during these wet periods, harvesting does help benefit the local eco system by slowing the drainage of rainwater to the river.

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