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Water quality models are a tool for simulating the movement of precipitation
and pollutants from the ground surface through pipe and channel networks,
storage treatment units and finally to receiving waters. Both single-event
and continuous simulation may be performed on catchments having storm
sewers and natural drainage, for prediction of flows, stages and pollutant
concentrations. Each water quality model has it's own unique purpose and
simulation characteristics and the reader is advised to thoroughly review
downloading and data input instructions for each model.
EPA Supported Models
BASINS: A Powerful
Tool for Managing Watersheds
A multi-purpose environmental analysis system that integrates a geographical
information system (GIS), national watershed data, and state-of-the-art
environmental assessment and modeling tools into one convenient package.
A Simulation Model for Aquatic Ecosystems
AQUATOX is a freshwater ecosystem simulation model. It predicts the
fate of various pollutants, such as nutrients and organic toxicants,
and their effects on the ecosystem, including fish, invertebrates, and
aquatic plants. AQUATOX is a valuable tool for ecologists, water quality
modelers, and anyone involved in performing ecological risk assessments
for aquatic ecosystems.
CORMIX for Mixing Zones
A mixing zone model that can be used to assess water quality impacts
from point source discharges at surface or sub-surface levels.
WASP6 is an enhanced version of the Water Quality Analysis Simulation
Program (WASP). This version runs more quickly than previous versions
of WASP, and allows for graphical presentation of results. This version
includes kinetic algorithms for
1) eutrophication/conventional pollutants, 2) organic chemicals/metals,
3) mercury, and 4) temperation, fecal coliform, and conservative pollutants.
model is a river and stream water quality model that is intended
to represent a modernized version of the QUAL2E (or Q2E) model (Brown
and Barnwell 1987).
EPA Center for Exposure Assessment
The Center for Exposure Assessment Modeling (CEAM) was established in
1987 to meet the scientific and technical exposure assessment needs
of the United States Environmental Protection Agency as well as state
environmental and resource management agencies. CEAM provides proven
predictive exposure assessment techniques for aquatic, terrestrial,
and multimedia pathways for organic chemicals and metals.
Quality Modeling Technical Support Center
The Watershed/Water Quality Modeling Technical Support Center assists
EPA Regions, State and Local Governments, and their contractors by providing
access to technically defensible tools and approaches that can be used
to develop Total Maximum Daily Loads (TMDLs), wast load allocations,
and watershed protection plans. The Center also provides a pathway for
bringing ORD research efforts into "real world" applications.