The Hahn Arroyo drainage channel was originally built in the 1960s. Over the years, it deteriorated and the concrete lining degraded and even failed during heavy rains. AMAFCA commissioned Sites Southwest to develop a conceptual design for the rehabilitation of the channel. AMAFCA and consultants decided on an innovative approach using sustainably oriented ideas and state-of-the-art technology. The arroyo would have multiple uses, be safe and still serve its drainage function.
Sites Southwest teamed with Smith Engineering for the design and rebuild of the Hahn. The primary purpose of the project was to replace the drainage lining while addressing water quality. The team took a “whole systems approach” by including a multipurpose trail, water harvesting strategies and channel areas as open space/park lands. One design element created diversion structures that remove pollutants from storm water, then harvest some of the water into cisterns. The water irrigates the landscape providing shade, wildlife habitat and visual relief.
Other enhancements include a dog watering station and way-finding signage.