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Floodplain Studies

Anderson Consulting Engineers’ staff experience includes the completion of literally hundreds of floodplain studies in variety of settings, including the preparing of Digital Flood Insurance Rate Maps (DFIRMs) and Flood Insurance Studies (FIS) for the delineation of FEMA-compliant flood hazard zones related to riverine flooding.  These studies have included the application of HEC-RAS (both state-state and unsteady flow), FLO-2D and HEC-2.  As part of this work, ACE staff has become well acquainted with the technical specifications and guidelines promulgated by FEMA, as well as floodplain regulations adopted by numerous communities, counties and states.  Continuous coordination and consultation with local community officials, FEMA staff and FEMA review contractors are integral parts of our work.  As part of these tasks, ACE staff has successfully proven their ability to communicate the goals and objectives of the National Flood Insurance Program (NFIP) to participating counties, cities and towns throughout Colorado, Wyoming, Utah, Nevada, Nebraska, California, Indiana, Kansas, Mississippi and Louisiana.

Anderson Consulting Engineers range of experience with respect to floodplain studies includes the following:

  • Preparation of countywide DFIRM Maps, DFIRM databases and FISs, with MIP data management
  • Use of geospatial data with GIS and AutoCAD in hydrologic and hydraulic modeling, floodplain map preparation and database creation
  • Hydraulic modeling of river systems, in both 1-D and 2-D, using steady-state and unsteady modeling techniques
  • Evaluation and delineation of floodplains and floodways in normal, split flow and looped flow situations
  • Use of industry standard automated tools, as well as the development and use of in-house automated tools, for hydrologic and hydraulic modeling applications, floodplain and floodway delineation, and DFIRM/FIS production
  • Preparation of FISs, PMRs, CLOMRs and LOMRs with acceptance by FEMA

A small sample of floodplain studies completed by ACE include the following: