About Hydrologic and Water Quality Assessment Modeling Website

This website provides proven predictive exposure assessment techniques for aquatic, terrestrial, and multimedia pathways for organic chemicals and metals. A wide range of analysis techniques is provided, ranging from simple desk-top techniques suitable for screening analysis, to sophisticated, state-of-the-art continuous simulation models.

The website hosts and distributes environmental simulation models and databases for urban and rural nonpoint sources, conventional and toxic pollution of streams, lakes and estuaries, tidal hydrodynamics, geochemical equilibrium, and aquatic food chain bioaccumulation. In addition to software distribution, the website team reviews and evaluates potential and existing software products, maintains and tests source code and command files, and provides user support. User support includes review, evaluation, and possible correction of routine run time errors or other problems encountered by the users and provides information exchange to assist users applying a model developed for one purpose to a new and different problem.

New software release versions periodically update source code and documentation enhancements or corrections. Maintenance activities focus on improvements and overcoming problems in the operation and application of products, code optimization, and hardware/software portability. Further development, refinement, and extension of model application and theory is a separate research and development activity.

For more information, visit our distribution and support policy page or browse the frequent questions page. If you would like to provide comments or ask a question, feel free to contact us.