As Florida’s population continues to grow, development will continue from the coast to the rural inland areas, as well as from southern counties to more northern counties. With this continued growth comes pressure for increased flood protection, optimization of surface water networks, higher levels of ecological protection, and new sources of water supply. Jones Edmunds has a talented team of modeling, design, ecological, and construction management professionals with experience in water control and spillway structure design to assist with these challenges.
The Jones Edmunds’ team has extensive experience in hydrologic and hydraulic modeling. We are highly experienced with the hydrologic and hydraulic models that are typically applied for flood insurance studies (e.g., SWMM, ICPR, and the HEC suite). This experience allows us to quickly determine the most appropriate model and level of detail for the project, which is very important in establishing a project that satisfies client and FEMA goals at the lowest cost.
Much of floodplain delineation can be performed using several automated GIS techniques that we have developed in which model results are converted into a DEM and then draped over the surface terrain. The simplest technique maps level-pool floodplains using the peak water surface elevation from the model node representing the drainage area being mapped. We use another automated GIS technique to create a sloped water surface floodplain using the peak water surface elevations from two model nodes at either end of a channel link. Often, these two techniques are combined within the same watershed.
DFIRM production involves combining the flood hazard polygons with the base map data and applying the required graphic specifications and map collar. Flood hazard polygons are attributed with zone labels, BFEs, limits of study, and other information. Once attribution is complete annotation begins. Annotation is required for flood zones, roads, corporate limits, grid coordinates, and other map and cartographic features. Fonts, line types and weights, and colors are applied according to FEMA’s G&S by applying standard symbologies.