US Army Corps of Engineers
Hydrologic Engineering Center

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HEC-FIA Version 3.0 is an update to HEC-FIA Version 2.2. New features and major changes to HEC-FIA Version 3.0 software package are:
Incorporating Uncertainty

HEC-FIA Version 3.0 has added uncertainty to its computations, which allows users to describe various inputs with continuous distributions instead of single values. These inputs can be sampled using a Monte Carlo method, which generates a range of possible results for the simulated flood event. A few examples are shown in the figure below.

Below is a list of the parameters for which uncertainty can be described using a continuous distribution:
  • Structure Value
  • Content Value
  • Foundation Height
  • Depth Damage Relationships
  • Mobilization Relationships
  • Warning Issuance Time

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Improved Workflow

A major goal of HEC-FIA Version 3.0 was to improve the linkages between HEC-FIA and HEC-WAT (Watershed Analysis Tool) and CWMS (Corps Water Management System) software. To accomplish this goal certain alternative characteristics are defined differently to better support the Model Linking Editors in HEC-WAT and CWMS. The study tree (see figure below) was redesigned to support the workflow of a project:

  1. Add maps to be used in the watershed/study.
  2. Define the watershed through elements that describe the watershed geographically.
  3. Create inundation configurations to define what computations will be used and how an event will be described at each structure.
  4. Add inventory elements including damage categories, occupancy types, structures, agriculture, and critical infrastructure.

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Supporting Multiple Structure Inventories

As in HEC-FIA Version 2.2, users can import structure inventories from a variety of sources. HEC-FIA Version 3.0 has added the ability to import from the National Structure Inventory (NSI). A major improvement to HEC-FIA Versions 3.0 is that multiple structure inventories can be defined in a single study. The ability to use inventories from multiple sources assists in scaling from lesser quality structure inventories to higher quality structure inventories throughout the feasibility project timeline; this also facilitates the evaluation of nonstructural measures that impact the location or characterization of structures within the floodplain.

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Added Support for Critical Infrastructure

HEC-FIA Version 3.0 has the capability to define Critical Infrastructure elements (see figure below). These elements are point based elements that have a beginning damage elevation, a Sector, and SubSector. Critical Infrastructure elements represent objects in the floodplain that have an impact on the economy that may not be fully represented by the depreciated replacement value of the object. While structures use Damage Categories and Occupancy types to group similar structures together, critical infrastructure elements use Sectors and SubSectors. HEC-FIA reports the severity of the hydraulic event at each infrastructure element that is impacted by the modeled flood. Data to support the critical infrastructure must be imported by point shapefile. The HSIP Freedom databases are a good source for critical infrastructure data to support HEC-FIA modeling.

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Integration with CWMS 3.0

HEC-FIA Version 3.0 is the consequences software in the CWMS software. CWMS assists in the real time operation of USACE projects, and HEC-FIA helps identify how regulation will impact the damageable elements in a watershed. Any consequence calculation performed by HEC-FIA Version 3.0 can be utilized in the CWMS software. These capabilities allow the comparison of operational changes based on impacts to population, structures, agriculture, and the economy.

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Indirect Economic Losses with ECAM

HEC-FIA Version 3.0 incorporated the Economic Consequence Assessment Model (ECAM) developed by Dr. Miles Light at University of Colorado Boulder, Boulder, CO. The ECAM tool describes indirect losses to the economy from catastrophic events like dam and levee failures. ECAM is a computable general equilibrium (CGE) model that takes the inputs of reductions in the production factors of the economy (Capital and Labor), and produces changes in the labor force and output of the impacted sectors of the economy for a given county. HEC-FIA produces the reductions in the production factors based on the direct economic loss calculations for structures and life loss. ECAM produces a report (see figure below) by county of the regional changes in Output and Employment by sector.

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