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A system for storing, collecting, and reusing rainwater from a rooftop, installed at a commercial-use building, that has been designed and constructed in accordance with the Washington State Building Code Council’s Permissive Rainwater Harvesting System Guidelines for Non-residential Occupancies (2002 or as amended), has a storage volume of at least 10 percent of the mean annual runoff volume generated from the contributing roof area, and for which design and construction has been approved by the director of the department of planning and development services. (Added by Amended Ord. 15-069, Nov. 16, 2015, Eff date Jan. 1, 2016).