EFDC+
Freemium
Open-source 3D hydrodynamics and water quality — the EFDC lineage modernised, with a commercial GUI option.
WASP
ActiveEPA's Water Quality Analysis Simulation Program — eutrophication, toxics and sediment in rivers and estuaries.
by US EPA
- Pricing
- Gov-Public
- License
- US Government (public domain)
- Commercial use
- Permitted
- Ecosystem
- Standalone, EFDC, HSPF
- Platform
- Windows
About WASP
WASP (Water Quality Analysis Simulation Program) is the EPA's general-purpose surface-water quality framework, simulating eutrophication, organic toxics, metals, mercury, pathogens and sediment across 1D, 2D and 3D segmentations of rivers, lakes and estuaries. It links to hydrodynamic drivers (EFDC, DYNHYD) and watershed loads (HSPF, SWAT, LSPC).
Decades of TMDL and regulatory studies run on WASP, and EPA still maintains and trains on it. When a US water-quality study needs an agency-recognised mechanistic model with more dimensionality than QUAL2K, WASP is the standing answer.
Where it fits in the workflow
TerrainCatchmentRainfallRunoffRoutingHydraulicsMappingReporting
Alternatives to WASP
Ranked by the topics, categories and workflow stages they share with WASP.
SWAT+
Open Source
The USDA watershed model for land use, sediment and nutrients — continuous simulation at catchment scale.
PHREEQC
Gov-Public
USGS geochemical modelling — speciation, batch reactions, 1D reactive transport and inverse modelling.
Visual MODFLOW Flex
Commercial
3D groundwater flow and transport modeling environment for MODFLOW, SEAWAT, and PEST calibration workflows.
BASINS
Gov-Public
EPA's watershed assessment suite — HSPF continuous watershed-quality modelling with GIS and data access built in.
CE-QUAL-W2
Free
The standard 2D reservoir and stratified-river water-quality model — temperature, DO and eutrophication.