The guidance listed here supersedes the noted affected component(s).
FEMA implemented a transformation of the guidelines and standards for flood risk mapping. These standards are consistent with the previous requirements for FEMA flood risk mapping. However, they represent a significant change in the way the requirements are organized that FEMA expects to result in more consistency nationally and improve production efficiency for the flood mapping program.
The new approach clearly organizes standards and guidance separate categories, avoids ambiguity with respect to what is truly mandatory and what is recommended that existed in the prior combined guidelines and standards for flood hazard mapping documents, and clarifies areas of flexibility creating opportunities for more efficient approaches.
Additionally, few changes were implemented through the policy memo, notably non-accredited levee analysis and mapping procedures, refinements to the definition of the Risk MAP process and products, requirements for documentation of the basis for SFHA designations, requirements for an initial estimate of the likely impacts of new analysis, new requirements for considering dune erosion, new vertical datum conversion requirements, updated lidar specifications, an updated quality management process, and a few other minor refinements.
Guidelines and Standards Policy Memo
Appendix K was updated (along with Appendix L) to reflect a more automated map creation protocol with less manual cartographic finishing. Changes to the FIRM graphics reflected in this revision include the addition of colors and other improvements to the symbols to help communicate risk more efficiently. To this end, floodways and areas behind levees are symbolized more prominently. Base Flood Elevation (BFE) labels, rounded to the tenth of a foot, are now shown on cross sections. Additional interpolated BFEs may still be placed between cross sections to facilitate elevation determinations. The overall page size and layout of the FIRM has been changed to a more standard page size and the map collar information was streamlined.
Appendix L was updated (along with Appendix K) to reflect changes made to the FIRM panel, the FIS Report (including the Map Index), and the Data Capture Standards. This update allowed for more automated and streamlined production of the FEMA regulatory products. Changes to the FIRM Database implemented in this update include inclusion of key engineering data previously specified in Appendix M, new tables to store information needed to automate the FIS Report tables and profiles, greater reliance on the profile baseline, and updated delivery file formats.
Appendix I revision provided additional guidance to be used by project teams while performing Discovery for Risk MAP projects, including an emphasis on up-front stakeholder coordination, engagement prior to meeting with communities, and the desired outcomes expected as part of the process.
Added clarification on documentation requirements; Hydrology guidance updates for rainfall-runoff modeling, statistical analyses, 1D steady flow, 1D unsteady flow, and 2D modeling; Floodway guidance updates for 1D steady flow, 1D unsteady flow, 2D, and link-node models; and Floodplain delineation guidance updates for 1D and 2D models.
Revised FEMA process for maintaining these Guidelines and requirements for Physical Map Revision (PMR) request submittals.
Added discussion of Monitoring Information on Contracted Studies (MICS) system, methods for updating alluvial fan flood hazards; Added final digital Flood Insurance Study (FIS) and Flood Insurance Rate Map (FIRM) deliverable specifications; Added description of revised countywide FIRM distribution protocol; Updated Letter of Map Change (LOMC) Distribution Service discussion to include Final Summaries of Map Action (SOMAs) and LOMC-VALID letters.
Added guidance on Report and Map Production, processing for PMRs consistent with Volume 1; Updated SOMA and LOMC validation process; Added guidance for the preparation of LOMR attachments.
Added requirements for Final SOMA and LOMC Distribution Service product; replaced requirements for Credited Structures Inventory System with requirements for FEMA Levee Inventory System; added requirements for production of Compendium of Flood Map Changes; revised requirements for use and maintenance of MICS system; added information on technical and administrative support data available from the FEMA archives, current fees, removed requirement for delivery of hard copy FIS report as part of deliverables for Engineering Study Data Package; provided clarification on deliverables for Letter of Determination Review requests; and revised requirements for maintenance of Cooperating Technical Partners (CTP) Database.
Deleted NIMA's Vector Product Format (VPF) and added MapInfo's native tabular format (TAB); also added requirement to document the geoid model and ellipsoid used.
Reference made to the new FEMA Levee Inventory System; Clarification added for levee freeboard requirements.
Added subsection explaining the Mapping Needs Update Support System (MNUSS) template; Revised the Community Partner Memorandum and Agreement template; Revised Statement of Work template; Added table to show correlations between templates and data in MICS system; Added requirements for CTP Mapping Activity Statements and templates.
Revised guidance for Preliminary FIS reports and final FIS report deliverable format; added examples of Flood Insurance Zone Data tables.
Changed numerous FIRM graphic specifications.
Updated Standard DFIRM database specifications; Added Enhanced DFIRM database specifications.
Added form for certification of work on Flood Map Projects; clarified requirements for submittal of Technical Support Data Notebook (TSDN) Indexes and inserted revised Indexes; added general TSDN requirements for coastal flooding analyses, shallow flooding analyses, ice-jam flooding analyses, and alluvial fan flooding analyses; clarified requirements for receiving Mapping Partner review of data submitted in support of community-initiated map revision.