Premier provided hydrologic and hydraulic engineering; civil, structural, and geotechnical engineering; survey and mapping; landscape design; permitting; and extensive stakeholder coordination with the Phoenix-Mesa Gateway Airport Authority (PMGAA), City of Mesa, FCDMC, and the National Resources Conservation Service. The purpose of Ellsworth Channel Relocation project was to provide additional acreage for development of the new east side PMGAA terminal and maximize development opportunities for the parcel. The project included final design for relocating an approximately 6,000-foot reach of Ellsworth Channel to the airport property boundary with a relocated channel length of approximately 3,000 feet. The project also included relocating the confluence of Ellsworth Channel with Powerline Floodway approximately 3,000 feet upstream, improvements to Powerline Floodway between the existing confluence and the new tie-in point, and the design of a new crossing of Powerline Floodway at the Hawes Road alignment. The team’s challenges were to establish a future 100-year runoff within this rapidly developing watershed that is acceptable to all stakeholders, and provide a design that minimized maintenance requirements.