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Ecosystems Research

Model Distribution

EPA Center for Exposure Assessment Modeling (CEAM)

The EPA Center for Exposure Assessment Modeling, or CEAM, was established to support environmental risk-based decisions by providing proven predictive exposure assessment techniques for aquatic, terrestrial, and multimedia pathways for organic chemicals and metals. CEAM distributes environmental software, reviews and evaluates potential existing software products, maintains and tests source code and command files, and provides user support.

Watershed and Water Quality Modeling Technical Support Center (WWQTSC)

The Watershed and Water Quality Modeling Technical Support Center, or WWQTSC, provides Clean Water Act implementation assistance to EPA regions, and state and local governments. The Center offers access to technically defensible tools and approaches that can be used in the development of Total Maximum Daily Loads (TMDL), waste load allocations, watershed protection plans, and other technical expertise.

U.S. Army Corp of Engineers Water Quality Models and Tools

EPA collaborates with the U.S. Army Corps of Engineers (CE) Water Quality Research Program (WQRP) to conduct research to improve understanding of the fundamental processes affecting water quality and the biotic structure of aquatic systems. The tools developed by WQRP provide managers with cost-effective methods and guidance for solving problems related to Corps water resource projects.

Community of Integrated Environmental Modeling (iemHUB)

The Integrated Environmental Modeling Hub — known as iemHUB — is an online community resource that supports the development, evaluation, and application of environmental models. It is designed to facilitate knowledge sharing, discussion, and collaboration on models and tools that support multimedia and interdisciplinary analysis. The iemHUB provides a unique environment for model access, simulation, and teaching and learning about environmental modeling.

Community Modeling & Analysis System (CMAS)

The Community Modeling and Analysis System, or CMAS, is hosted by EPA and the University of North Carolina at Chapel Hill to support users of EPA’s Community Multi-scale Air Quality (CMAQ) model. CMAS distributes CMAQ software, hosts user email exchanges, and provides new user training on the CMAQ modeling system. This growing community, which includes thousands of users in more than 50 countries, has helped assess and improve the model’s functionality. Their input has assisted EPA scientists in prioritizing modeling research to improve CMAQ’s capabilities.

Watershed Central

Watershed Central is a web-based tool designed by EPA to assist users in developing and implementing effective watershed management programs. The site includes guidance, tools, case studies, and data sets to allow users to share information, analyze data, and identify opportunities to initiate or strengthen watershed efforts.

Better Assessment Science Integrating Point and Non-point Sources (BASINS)

BASINS (Better Assessment Science Integrating point and Nonpoint Sources) is a multi-purpose environmental analysis system designed for use by regional, state, and local agencies in performing watershed and water quality-based studies. It integrates geographical information system (GIS), national watershed data, and state-of-the-art environmental assessment and modeling tools into one convenient package.

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