Watershed

Oral

394350 - WATERSHED MODELS FOR TMDL DEVELOPMENT AND IMPLEMENTATION

Wednesday, June 6
4:00 PM - 5:30 PM
Location: Greenway IJ
Co-Authors: G. Padmanabhan, Fargo, ND – North Dakota State University

As part of the work carried out by the Total Maximum Daily Load (TMDL) Analysis and Modeling Task Committee of the American Society of Civil Engineers’ Environmental and Water Resources Institute and presented in its final report (2017), 14 watershed models were selected and reviewed for their suitability and capability for TMDL development and implementation. Results will be discussed in this presentation. All the 14 models have potential for use in TMDL development depending on the project specific circumstances; however, only a few of them have been widely used. Model sources, capabilities, and applicability are briefly described. Key features of the models’ hydrologic, soil erosion and sediment transport, and water quality constituent simulation capabilities and techniques are compiled in tables and graphs. Notable strengths and limitations of the models are identified and presented in a table along with remarks on usefulness of the models for TMDL development and implementation to serve as a guide. Recommendations for future work are provided. The reviews are intended to assist the TMDL community in making informed selections of models to meet the varied and wide conditions of the impaired waters requiring TMDL developments and implementations and avoiding misuses of the commonly used models beyond their capabilities and intended uses. The reviews are also helpful in understanding the potential and limitations of a model that might have been selected considering other critical factors. Research to develop more comprehensive and efficient physically-based models with uncertainty analysis capabilities including combining strengths of existing models must continue.

Deva K. Borah, PhD, PE, F.ASCE

Senior Engineer
City of Chesapeake Department of Public Works

Deva K. Borah, Ph.D., P.E., F.ASCE is currently a Senior Engineer for the City of Chesapeake Department of Public Works, Chesapeake, VA. He is a leader in the fields of civil, environmental, and agricultural engineering. His specific contributions have been in hydrologic, hydraulic, and nonpoint-source pollution modeling and monitoring, evaluation of best management practices (BMPs) and developing total maximum daily loads (TMDL) and watershed implementation plans (WIP). He developed formulations and computer codes of five original modeling systems: (1) DWSM, a dynamic watershed simulation model simulating hydrology and nonpoint-source pollution; (2) STREAM2, a stream sediment transport model simulating graded sediment; (3) ROUTES, a hydrodynamic and sediment transport model for tidal estuaries and bays; (4) SALTWEDGE, a saltwater intrusion model for estuaries; and (5) BEACHES, a beach/shoreline evolution model. His recent work and publications on in-depth reviews and comparisons of watershed hydrologic and nonpoint-source pollution models have been valuable resources for engineers, modelers, and managers in understanding the fundamental basics and strengths of the models and selecting the most suitable model for a project. He has lead in numerous roles at ASCE, including serving on technical committees and as President of the Central Illinois Section East Branch.

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