Smith teamed with AMAFCA to develop plans for the rehabilitation of the Hahn Arroyo. Rather than designing a conventional floodway, Smith conceptualized a sustainable approach to the design for the arroyo. This included using recycled concrete for seating, harvesting water from the channel for irrigation, cleaning storm waste before it reached the Rio Grande, and creating an urban park for the enjoyment of the public.
Smith worked with the City of Aztec to identify the best technology to meet the new standards. To keep operations simple and increase capacity to 1.5 MGD, an extended aeration regime and an advanced nutrient removal system were selected. The plant was recognized in 2010 as the “NM Project of the Year” by the American Public Works Association and for its “Engineering Excellence in NM” by the American Council of Engineering Companies.