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Hydraulic modeling for hazard potential classification of dams

Johan Anestad and Ahintha Kandamby discussed 2D hydraulic modeling at the 2018 VA Water Conference, Richmond, VA

OBG recently took part in the Virginia Water Conference, which was hosted by the Virginia Lakes and Watersheds Association (VLWA) on March 4-6, 2018 in Richmond, Virginia. 

During the conference's dam safety session, OBG's Johan Anestad, PE and Ahintha Kandamby, PhD, EIT discussed the importance of using two-dimensional (2D) modeling for hazard classification of dams, as well as the disadvantages of one-dimensional (1D) modeling.

Two-Dimensional Hydraulic Modeling for Hazard Potential Classification of Dams [PDF]

Dams located in flat topography have presented challenges to hydraulic modelers since the 1D hydraulic models generally used to estimate conditions in a well-defined channel are poorly suited for situations where water flows in multiple directions or into a large body of water. These 1D models, however, are often used due to the lack of efficient and affordable 2D models. Recent advances in 2D modeling capabilities have led to an increase in their use for assessing dam hazard potential.

OBG recently completed hazard potential classifications for two dams in the eastern coastal region of Virginia using 1D and 2D modeling capabilities of the U.S. Army Corps of Engineers. Both dams are in flat topography and located immediately upstream of water bodies that are much larger than the reservoir impounded by the dams. Johan and Ahintha's presentation outlines the modeling methods used, results of the hazard potential classification, and the advantages of using 2D over 1D modeling. 

About Johan Anestad, PE: Johan has more than 20 years of professional experience in dam safety and water resources engineering, with specific expertise in hydrology and hydraulics. He has been involved in all phases of dam investigations, evaluations, design, and construction projects.

About Ahintha Kandamby, PhD, EIT: Ahintha has more than 13 years of experience in hydraulics and hydrology in water resource engineering. He specializes in cold region ice engineering focused on numerical modeling of river ice formation and hydrodynamics with expertise in 1D and 2D numerical modeling using available proprietary and research-based software and codes, as well as solving complex problems in hydrodynamics. He has worked as a lead hydraulics and hydrology modeler for river restoration, dam safety, flood warning, sediment transport, and sewer overflow abatement projects using 1D and 2D modeling software.