Floodplain Modeling

WRMA’s hydraulic design team includes professional engineers who specialize in the analysis, planning and design of projects encompassing hydrology, hydraulics, computer modeling, hydraulic design, flood control, floodplain management, stream bank protection, environmental compliance for flood control projects and habitat conservation and enhancement related to flood control projects.

WRMA engineers are experienced with all methods used to reduce or prevent the detrimental effects of flood waters including the installation of rock berms, rock rip-raps, sandbags, maintaining normal slopes with vegetation or application of soil cements on steeper slopes, and construction or expansion of drainage channels. Other applied methods include levees, dikes, dams, retention, and detention basins.

Our team holds nationally recognized certifications in flood plain management (CFM) from the Association of State Flood Plain Managers (ASFPM) and the U.S. Army Corps of Engineers’ HEC-RAS (River Analysis System) modeling program from the Federal Highway Administration (FHWA), and have completed flood control projects for various agencies including the Federal Emergency Management Agency (FEMA), the U.S. Army Corps of Engineers (USACE), and the South Florida Water Management District (SFWMD).

WRMA staff have acquired extensive experience with the application and integration of ARC HYDRO GIS and LiDAR/SAR-derived Digital Elevation Models (DEMs) for digital flood plain mapping per the requirements of FEMA’s Map Modernization (MAPMOD) program. WRMA CFM’s have received HAZUS training for flood loss estimates and CRS Flood Mitigation Planning.

  • WRMA engineers perform floodway encroachment and floodplain mapping, Digital Elevation Model (DEM) development and accuracy assessment for digital flood mapping, and computer H&H simulation for development of flood control plans including the design of pump stations, tidal water control structures and gates.
  • WRMA’s CFM staff provide certification services for the Federal Emergency Management Agency (FEMA) Flood Insurance Program (FIS) including Levee Accreditation, Letter of Map Revision (LOMR), Conditional Letter of Map Revision (CLOMR) and Flood Zone Designation Change Requests, Floodplain mapping per Map Modernization (MAPMOD) Digital mapping requirements, and HAZUS training for flood loss estimates and CRS Flood Mitigation Planning.
  • WRMA staff provide technical and administrative assistance with FEMA’s flood Hazard Mitigation Grant Program (HMGP) application, preparation of FEMA’s Pre-Disaster Mitigation (PDM) and follow up HMGP applications, post-disaster water resources facilities assessment, and agricultural and urban economic damage assessment using USACOE’s Flood Damage Assessment (FDA) H&H methodology using airborne and satellite imagery.

Our Floodplain/Flood Control Water Resources Modeling Services include:

FEMA 100-Year (BFE) Floodplain Modeling and Mapping

2-D Hydrodynamic Modeling for Tidal Basins

Contaminant Transport Groundwater Modeling

Evaluation of Flood Insurance Claims for Public/Private Entities

Hydraulic Modeling and Design of Open Channels

Hydraulic Performance Evaluations of Existing Stormwater Collection Systems

WRMA utilizes the following Modeling Suites:

AGDAM                                             Agricultural Flood Analysis Model

BASINS/HSPF                                   Non-Point Source Water Quality Model

DAMCAL                                           Urban Damage Analysis Model

FESWMS-2DH                                   Finite Element Surface Water Modeling System 

GMS/SEEP2D                                    Seepage Modeling Suite

HEC-HMS                                          USACE hydrologic modeling system

HEC-RAS                                           USACE one-dimensional river analysis system model

HEC-FDA                                           USACE Flood Damage Analysis Package

ICPR4                                                 Interconnected Pond Routing Hydrodynamic Model

MikeUrban                                          Urban Stormwater Modeling

MODFLOW-3D                                 Groundwater Model

QUAL-2E                                           In-stream Water Quality Model

RMA-2                                                River/estuary two-dimensional hydrodynamic model

SWAT                                                 Soil and Water Assessment Quality Model

SWMM                                               USEPA hydrologic, hydraulic, and water quality model

UNET                                                 Quasi-two-dimensional hydraulic model

WSPRO                                              USGS/USFHA bridge waterways analysis model

WSP2                                                  USGS water surface profile model

XPSWMM/XPSoftware                     Hydrologic, hydraulic, and water quality model