Billy E. Johnson, PHD, PE, D.WRE, F.ASCE, is a Senior Scientist at LimnoTech with broad expertise in Water Resources, including successful leadership of projects involving the development and application of sediment, nutrient, contaminant, and riparian vegetation simulation modules for civil works and military projects. These modules have been integrated with a variety of U.S. Army Corps of Engineers (USACE) hydraulic and hydrologic modeling systems. He has over 30 years’ experience as a research civil engineer, educator, and consultant for projects across the U.S. Billy previously served as a senior researcher at the U.S. Army Engineer Research and Development Center (ERDC), Environmental Laboratory (EL). In addition to working for EL, he also worked for the ERDC Coastal and Hydraulics Laboratory (CHL), and the Memphis District USACE. He was an adjunct faculty member at Mississippi State University and served as an Associated Editor of the Journal for the American Water Resources Association (JAWRA). He works at one of LimnoTech’s other staff locations in Roseville, CA.