River Engineering & Stream Restoration

A major shift has occurred in the recent past because of the fundamental change in which society values its rivers and watersheds. There has been a major demand for managing and restoring rivers to sustain ecologic and environmental benefits, rather than just economic utilitarian exploitation. This shift poses both a challenge and an opportunity for regulatory agencies who were trained to simply reduce river flooding and who are now being asked to restore rivers to their natural conditions.

Clients worldwide rely on our river engineering and stream restoration expertise to tackle difficult problems, perform analysis, and provide recommendations for the hydraulic design of bridges, culverts, dykes, diversions, and hydraulic structures. We are a leader in the application of hydrodynamic models for river engineering and flood hazard mapping. We have experience in unsteady-flow simulation for modeling the propagation of a flood wave through river and floodplain systems, and expertise in application of two-dimensional models for analyzing changes in velocity fields around structures. We couple hydrodynamic models with GIS applications for flood hazard mapping and preparing floodplain management plans.

We use sophisticated computer simulation models to provide river engineering for projects that include:

• 2-dimensional modeling
• Unsteady-state flow simulation
• Water surface profile analysis for flood hydrographs and multiple channels
• Simulation of tidal effects
• Reservoir spillway gate operation impacts
• Modeling of wind set-up
• Dam breach analysis and flood inundation mapping

Our project experience and expertise includes:

• Flood analysis and floodplain management
• Flood control evaluation
• Rip-rap, revetment structures, bendway weirs, and channel design
• Bridge, culvert, and spillway design
• Bridge scour analysis and countermeasure design
• Dredging and sediment removal design
• Predictive flood inundation and flood hazard mapping
• Dam breach failure analysis
• Real-time flood forecasting
• Reservoir operation simulation modeling
• Flood frequency analysis, including Probably Maximum Precipitation (PMPs) and Probably Maximum Floods (PMFs)
• Sediment transportation modeling and analysis
• Stable channel design and streambank stabilization
• River engineering and stream geomorphology
• Stream restoration
• Pipeline stream crossings
• Aquatic ecology and habitat enhancement
• Surface and groundwater interaction
• Water quality analysis and improvement
• Permitting and regulatory issues
• Environmental impact assessments

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