Purpose: | Determine ecosystem response to change in flow regime |
Developer: | United States Army Corps of Engineers, Hydrologic Engineering Center (USACE-HEC) |
Key Features: | ArcGIS extension; displays potential planting areas and areas affected by flow |
Latest Release: | Version 3.0, January 2013 |
OS Platform: | Windows |
Cost: | Free |
Related Software: | Detlares D-Ecology, DHI Eco-Lab |
Website: | HEC-EFM home page |
The HEC-EFM (Ecosystem Function Model) is a planning tool for ecosystem restoration and water resource management as it identifies ecological impacts (habitat and wetlands) resulting from a change in flow regime. HEC-EFM analysis centers on functional relationships that relate hydrologic and hydraulic time series data with the ecosystem using four basic criteria: 1) season, 2) duration, 3) rate of change and 4) percent exceedance. Using these functional relationships, HEC-EFM performs statistical computations on time series data of flow and stage against specific criteria to produce a single flow value for each relationship. The program can be used to determine the environmental effects of a change in reservoir operations.
Key features of the HEC-EFM model include reporting tools and GIS capabilities. The HEC-GeoEFM is an ArcMap extension that supports spatial analyses frequently used when implementing the HEC-EFM. HEC-EFM also has plotting tools that allow for multiple concurrent comparisons. Use of the HEC-GeoEFM requires a user license for ArcMap, and for Spatial Analyst and 3D analyst extensions for ArcMap.
Advantages | Limitations |
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Illustrative Screens |
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Africa | East Asia and the Pacific | Europe & Central Asia | Latin America & the Caribbean | Middle East and North Africa | South Asia |
Kenya (Envi. Flow Assessment) |
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