![]() ![]() How do I Find Out if a Structure or Property is Located in the Special Flood Hazard Area? Furthermore, all floodplains, including coastal flooding from the Chesapeake Bay, have been delineated using updated topography. Hydrologic and hydraulic analyses for all riverine studies have been revised by the U.S. In order to perform this conversion, effective elevation values from the National Geodetic Vertical Datum of 1929 (NGVD 29) were adjusted downward by. What Else Has Changed?Īll flood elevations shown in this Flood Insurance Study are now referenced to the North American Vertical Datum of 1988 (NAVD 88). The digital files will be available online when these maps become effective. The improvements in spatial accuracy provided by the new base map, and the availability of electronic floodplain information should greatly enhance the ability to use the maps for planning, permitting, and insurance applications. ![]() With this update a Digital Flood Insurance Rate Map (DFIRM) was produced that will be compatible with GIS (Geographic Information Systems). The most significant change is that the new maps have been prepared with updated base mapping and topography that will improve the accuracy of floodplain determinations. Some communities within Maryland are now being shown a single set of countywide FIRMs. FIRMs also depict other information including Base (I percent annual chance) Flood Elevations (BFEs) or flood depths, floodways, and common physical features such as roads. A FIRM illustrates the extent of flood hazards in a community by depicting flood risk zones and the Special Flood Hazard Area, and is used with the FIS report to determine the floodplain development regulations that apply in each flood risk zone and who must buy flood insurance. An FIS is a narrative report of the community's flood hazards that contains prior flooding information, descriptions of the flooding sources, information on flood protection measures, and a description of the hydrologic and hydraulic methods used in the study. When FEMA maps flood hazards in a community or county, two products are produced a Flood Insurance Study (FIS) report and a Flood Insurance Rate Map (FIRM). Development may take place within the Special Flood Hazard Area provided that it complies with local floodplain ordinances that meet NFIP criteria. FEMA maps include the Special Flood Hazard Area, which is the area that has a 1 percent or greater chance of flooding in any given year. The NFIP is based on the agreement that if a community practices sound floodplain management, the Federal Government will make flood insurance available to residents in that community. What is the NFIP?Ĭongress established the National Flood Insurance Program (NFIP) due to escalating costs to taxpayers for flood disaster relief. FEMA’s Risk Assessment, Mapping and Planning Partners (RAMP) is producing the DFIRM product in Frederick County. MDE is the Cooperating Technical Partner (CTP) on three of these products in Baltimore City, Baltimore County, and Montgomery County. ![]() Currently, 4 of the 6 oldest floodplain mapping products are in production to be remapped. Using the schedule for map production in 2017, the average age of the DFIRM products in the Maryland is 4 years with 75% of the State at 3 years or less. Community Information What is the average age of floodplain data in Maryland? ![]()
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