Flood Insurance Rate Map (FIRM) Database Technical Reference

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Flood Insurance Rate Map (FIRM)Database Technical ReferencePreparing Flood Insurance Rate Map DatabasesFebruary 2019

FIRM Database Technical ReferenceFor more information, please visit the FEMA Guidelines and Standards for Flood RiskAnalysis and Mapping webpage odrisk-analysis-and-mapping)). Copies of the Standards for Flood Risk Analysis andMapping policy, related guidance, technical references, and other information about theguidelines and standards development process are all available here. You can also searchdirectly by document title at www.fema.gov/library.Implementation InstructionsThis version of the Technical Reference must be used on projects as described below.Generally, the changes in this version may also be implemented on any project, incoordination with the FEMA Project and Contracting Officer’s Representative.Revision DateFebruary 2019ImplementationImplemented for all projects beginning Data Development afterMarch 1, 2019Table of RevisionsThe following summary of changes details revisions to this document subsequent to itsmost recent version in February 2018.Affected Sectionor SubsectionRevisionDateSections 3, 4, 8and 9February2019Guidelines and Standards forFlood Risk Analysis and MappingRevision DescriptionRemoved S CBRS and added newLEVEE AN TYP field in S LeveePage iFIRM Database Technical Reference

FIRM Database Technical ReferenceTable of ContentsFlood Insurance Rate Map (FIRM) Database Technical Reference . iPreparing Flood Insurance Rate Map Databases . iFIRM Database Technical Reference . 11.FIRM Database Overview . 22.File Formats and Setup . 23.Table Descriptions . 24.FIRM Database Table Deliverables by MIP Data Capture Task . 65.Field Specifications . 95.1Field Types . 95.1.1GDB Field Specifics .95.1.2Shapefile Field Specifics . 105.1.3Primary Key Fields . 105.2Field Domains . 105.3Acceptable Null Values . 116.Metadata and Sources . 117.Spatial Reference Systems . 138.Topology Rules . 139.FIRM Database Tables . 19Table: S Alluvial Fan . 19Table: S Base Index . 22Table: S BFE. 23Table: S Cst Gage. 26Table: S Cst Tsct Ln . 29Table: S Datum Conv Pt . 36Table: S FIRM Pan . 38Table: S Fld Haz Ar . 41Table: S Fld Haz Ln . 47Table: S Gage . 48Table: S Gen Struct. 50Guidelines and Standards forFlood Risk Analysis and MappingPage iiFIRM Database Technical Reference

FIRM Database Technical ReferenceTable: S HWM. 52Table: S Hydro Reach . 54Table: S Label Ld . 55Table: S Label Pt. 56Table: S Levee . 59Table: S LiMWA . 62Table: S LOMR . 63Table: S Nodes . 64Table: S PFD Ln. 66Table: S PLSS Ar . 67Table: S Pol Ar . 69Table: S Profil Basln . 72Table: S Riv Mrk. 75Table: S Stn Start . 77Table: S Subbasins . 78Table: S Submittal Info . 80Table: S Topo Confidence . 83Table: S Trnsport Ln . 85Table: S Tsct Basln . 87Table: S Wtr Ar . 89Table: S Wtr Ln . 90Table: S XS . 92Table: Study Info . 95Table: L Comm Info. 100Table: L Comm Revis . 104Table: L Cst Model . 105Table: L Cst Struct . 111Table L Cst Tsct Elev . 112Table: L ManningsN . 114Table: L Meetings. 115Guidelines and Standards forFlood Risk Analysis and MappingPage iiiFIRM Database Technical Reference

FIRM Database Technical ReferenceTable: L MT2 LOMR . 116Table: L Mtg POC . 118Table: L Pan Revis . 120Table: L Pol FHBM . 121Table: L Profil Bkwtr El . 122Table: L Profil Label . 124Table: L Profil Panel . 125Table: L Source Cit . 128Table: L Summary Discharges . 130Table: L Summary Elevations. 132Table: L Survey Pt. 134Table: L XS Elev . 137Table: L XS Struct . 14210.National Flood Hazard Layer . 14410.1 NFHL Field Changes . 14510.2 NFHL Spatial Reference Systems . 145List of TablesTable 1: FIRM Database Table Summary . 2Table 2: FIRM Database Submittal Table . 7Table 3: Source Citation Abbreviations. 12Table 4: Topology Rules . 14Table 5: S Alluvial Fan . 21Table 6: S Base Index . 23Table 7: S BFE Requirements . 24Table 8: S BFE .25Table 9: S Cst Gage . 29Table 10: S Cst Tsct Ln . 35Table 11: S Datum Conv Pt . 38Guidelines and Standards forFlood Risk Analysis and MappingPage ivFIRM Database Technical Reference

FIRM Database Technical ReferenceTable 12: S FIRM Pan . 41Table 13: S Fld Haz Ar . 45Table 14: Flood Zone and Zone Subtype Cross-Walk . 45Table 15: S Fld Haz Ln . 48Table 16: S Gage . 50Table 17: S Gen Struct . 52Table 18: S HWM . 54Table 19: S Hydro Reach . 55Table 20: S Label Ld . 56Table 21: S Label Pt . 58Table 22: S Levee . 61Table 23: S LiMWA . 63Table 24: S LOMR. 64Table 25: S Nodes. 66Table 26: S PFD Ln . 67Table 27: S PLSS Ar . 69Table 28: S Pol Ar . 72Table 29: S Profil Basln . 75Table 30: S Riv Mrk . 76Table 31: S Stn Start . 78Table 32: S Subbasins . 79Table 33: S Submittal Info . 83Table 34: S Topo Confidence . 84Table 35: S Trnsport Ln . 86Table 36: S Tsct Basln . 88Table 37: S Wtr Ar . 90Table 38: S Wtr Ln . 91Table 39: S XS .94Table 40: Study Info . 99Table 41: L Comm Info . 103Guidelines and Standards forFlood Risk Analysis and MappingPage vFIRM Database Technical Reference

FIRM Database Technical ReferenceTable 42: L Comm Revis . 105Table 43: L Cst Model . 110Table 44: L Cst Struct. 112Table 45: L Cst Tsct Elev . 113Table 46: L ManningsN . 115Table 47: L Meetings . 116Table 48: L MT2 LOMR . 118Table 49: L Mtg POC. 119Table 50: L Pan Revis . 121Table 51: L Pol FHBM . 122Table 52: L Profil Bkwtr El . 123Table 53: L Profil Label . 125Table 54: L Profil Panel . 127Table 55: L Source Cit. 130Table 56: L Summary Discharges . 132Table 57: L Summary Elevations . 134Table 58: L Survey Pt . 136Table 59: L XS Elev. 142Table 60: L XS Struct . 144Guidelines and Standards forFlood Risk Analysis and MappingPage viFIRM Database Technical Reference

FIRM Database Technical ReferenceFIRM Database Technical ReferenceThe purpose of this Technical Reference is to provide guidance to the Mapping Partnerthat prepares the Preliminary and Final Flood Insurance Rate Map (FIRM) Databasesdelivered to the Federal Emergency Management Agency (FEMA). This TechnicalReference is not intended to specify in-process compilation or digitizing procedures but topresent standards and requirements for outputs and deliverables.Although occasional guidance (or best practices) have been included where necessarythroughout this Technical Reference, the majority of the content in this TechnicalReference represent standards to be used in preparing the Preliminary and Final FIRMDatabases.Due to the dynamic nature of some aspects of digital Geographic Information System(GIS) data, certain requirements are specified in documents outside of this TechnicalReference. The following documents are also referenced in this Technical Reference: FIRM Database Verification Tool (DVT) – Topology Verification Guidelines FIRM Panel Technical Reference Flood Insurance Study (FIS) Report Technical Reference Domain Tables Technical Reference Metadata Profiles Technical ReferenceThe most current version of these documents can be obtained from the FEMA Guidelinesand Standards for Flood Risk Analysis and Mapping webpage.Guidelines and Standards forFlood Risk Analysis and MappingPage 1FIRM Database Technical Reference

FIRM Database Technical Reference1. FIRM Database OverviewThe FEMA FIRM Database will store the digital GIS data used in the map productionprocess, as well as tabular information inside the Flood Insurance Study (FIS) report. TheDatabase will provide a standard, systematic method for FEMA to distributecomprehensive details of flood hazard identification studies to the public and others in adigital format.Additional guidance on individual FIRM Database elements may be found in the FIRMDatabase Guidance document.2. File Formats and SetupAll of the submitted GIS layers and tables must be in the same GIS file format. Therequirements for production FIRM Databases and FIRM Database Submittals aredescribed below. FIRM Database Submittals shall be delivered in the Environmental SystemsResearch In

FIRM Database Technical Reference Guidelines and Standards for Flood Risk Analysis and Mapping Page 2 FIRM Database Technical Reference 1. FIRM Database Overview The FEMA FIRM Database will store the digital GIS data used in the map production process, as well as tabular information inside the Flood Insurance Study (FIS) r eport. The

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