The dynamics of rivers involve complex interactions between water, sediment transport, and bed geometry. River management depends on predicting the effects of these interactions, including channel migration and cross-sectional change, thermal and flow pattern effects from intakes and outfalls, and ecological effects of management strategies. FLOW-3D is widely used in the Water and Environment industry to address complex river dynamics and to predict fluvial behavior. In addition to solving free-surface flow patterns, FLOW-3D includes a broad selection of powerful physics packages that address most river management problems. Some examples of processes that are regularly modeled with FLOW-3D include thermal and saline transport and stratification, pollutant fate and transport (reactive and non-reactive), turbulent air entrainment and residence, and sediment transport (including erosion and deposition.