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<br />Guidelines and Specificationsfor Flood Hazard Mapping Partners [April 2003] <br /> <br />consultation with the Project Management Team, may decide to produce the new or updated <br />FIRM in the Community-Based Format. <br /> <br />Graphics <br /> <br />FEMA graphics standards are to be used unless agreed upon with FEMA during the Project <br />Scoping phase. Communities may have some flexibility in the presentation of flood hazard <br />information on the FIRM, particularly with regard to the presentation of flood hazard data based <br />on future-conditions analyses. General guidance regarding the inclusion of future-conditions <br />flood hazard data on the FIRM and in the FIS report is provided in Appendix C, Subsection C.8 <br />of these Guidelines. <br /> <br />Database <br /> <br />The FEMA standard digital FIRM spatial database is to be produced. Any deviations are to be <br />agreed upon with FEMA during the Project Scoping phase. Also, during the Project Scoping <br />phase, the Project Management Team must decide on the options that will be included in the <br />enhanced database. <br /> <br />The digital FIRM Database product that accompanies new digital FIRMs has the flexibility to <br />incorporate additional data that are not necessarily shown on the FIRM. The enhanced digital <br />FIRM Database provIdes the capabIhty to add other data to the standard dIgItal FIRM Database. <br />For example, GIS data representing watersheds and sub-basins, stream reach hydrologic network <br />structure, building footprints, land-use classifications, or soil types may be included. Other <br />datasets (e.g., model input and output files, digital elevation certificates, digital photographs of <br />hydraulic structures) also could be included. <br /> <br />Detailed information on the standards for the digital FIRM Database is provided in Appendix L <br />of these Guidelines. <br /> <br />Map Scales <br /> <br />Map scales are to be selected depending on the density of information, width of floodplains, type <br />of study (i.e., detailed, approximate), and scale of the previously prepared FIRM(s). Subsection <br />1.4.2.2 describes the map scale selection process. <br /> <br />Datum <br /> <br />FEMA would prefer to use North American Vertical Datum of 1988 (NA VD88) as the elevation <br />datum, except in certain circumstances such as when a community does not plan to adopt <br />NA VD88 for local vertical control or when the conversion of existing information referenced to <br />another datum is cost prohibitive. Detailed information on the protocol for selecting the vertical <br />datum is provided in Appendix B of these Guidelines. <br /> <br />Map Layout <br /> <br />A standard coordinate system and horizontal datum for all FIRMs is desirable so that they can be <br />easily referenced to one another. The preferred coordinate system is Universe Transverse <br /> <br />1-42 <br /> <br />Section 1.3 <br />