Ford Engineers collaborated with the U.S. Army Corps of Engineers, Hydrologic Engineering Center (HEC) to develop the Ecosystem Functions Model application HEC-EFM and has enhanced this application for more than a decade. HEC-EFM uses statistical analyses to assess empirical relationships between hydrologic conditions, the environment, and hydraulic states. The analyses provide insight to ecosystem dynamics, thus identifying impacts of water management decisions.

We completed the tasks listed below and continue to enhance the application.

  • Modernized a legacy Fortran statistical analysis program to initiate development of HEC-EFM, transitioning to Visual Basic, developing an innovative graphical user interface, and integrating the application with GIS.
  • Removed HEC-EFM’s dependency on ArcGIS software to satisfy Corps requirements.
  • Enhanced flow-frequency capabilities.
  • Added the ability to analyze statistics for individual years.
  • Integrated reading and writing to the Corps’ HEC-DSS data management system.
  • Added capability to compute flow-duration curves.
  • Enabled analysis of rate of recession for flow and stage at arbitrary intervals.
  • Added capability to use multiple flow input files.
  • Added hypothesis tracking of the relationship between flow and ecosystem betterment.
  • Added uncertainty and confidence tracking.
  • Added GIS capability to intersect multiple layers.
  • Improved the application’s input and output capabilities, flow duration queries, computation of index values, and GIS capabilities.
  • Added a reverse look-up query and save changes message.
  • Updated the application’s use of the Windows registry.
  • Enhanced the application to enable the use of groups of flow regimes during a model run.
  • Enabled selection of style sheets.
  • Produced a design document and project management plan for incorporating HEC-EFM into HEC's Watershed Analysis Tool, HEC-WAT.

The HEC-EFM application is available from HEC’s website.

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