Donald Smith is a pioneer in developing and applying numerical computational models to surface water systems. During the past 47 years, Don has been responsible for a wide variety of model development and application projects involving hydrodynamic, thermal, water quality, and sediment transport for estuaries, streams, and reservoirs. He is the principal author of HEC-5Q, a river-reservoir temperature and water quality model developed for the US Army Corps of Engineers Hydrologic Engineering Center. Don has applied HEC-5Q to a number of major watershed systems in regions throughout the country. In addition, Don has extensive experience using other models, such as RMA’s finite element models, and has managed numerous water quality studies for the firm, including many in the San Francisco Bay and Sacramento-San Joaquin Delta. Don is a California-licensed professional engineer and holds a bachelor’s degree in civil engineering from the University of California, Berkeley.