Description: <DIV STYLE="text-align:Left;"><DIV><DIV><P><SPAN>The S_Pol_Ar table contains information about political areas within the Flood Risk Project area. This includes the attributes for the political areas within the Flood Risk Project and whether or not they have been studied or participate in the National Flood Insurance Program (NFIP). The political jurisdiction assigned to each area corresponds to the jurisdiction responsible for NFIP and floodplain management for that area. This table is used in following FIS Report components: the FIS Report cover, the FIRM panel index, the Panel Locator on the FIRM panels, the Transect Locator Map and the following tables in the FIS Report: Listing of NFIP Jurisdictions, Flooding Sources Included this FIS Report, Flood Zone Designations by Community, Levees, Transect Locator Map, Summary of Topographic Elevation Data Used in Mapping, Community Map History, Summary of Contracted Studies Included in this FIS Report and Community Meetings. The spatial entities representing political areas are polygons. </SPAN></P></DIV></DIV></DIV>
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Description: <DIV STYLE="text-align:Left;"><DIV><P><SPAN>The S_Cst_Gage layer is required when gage information (from tide, wind or buoy stations) is used in the determination or to support flood height calculations. Specifically, this table is required in the following situations: when tide gage information is used to support the calibration and validation of hydrodynamic models; when tide gage information is used in the determination of flood elevations by statistical analyses of annual extrema; when wave buoy data provides information regarding the wave climate in the Flood Risk Project area; when wave buoy data has been used in the estimation of offshore wave conditions; for calibration and validation of a numerical wave model and when data from wind stations has been used for water level hindcasts or wave estimation. Wave heights, wave period and spectral parameters computed during the Flood Risk Project must be compared with observed data from wave buoys whenever possible. The S_Cst_Gage table contains information about coastal gages for the Flood Risk Project area. The spatial location of these gages may be some distance from the areas for which coastal flood hazards were determined. This information is needed for the Tide Gage Analysis Specifics table in the FIS Report. The spatial entities representing the coastal gages are points. </SPAN></P></DIV></DIV>
Description: <DIV STYLE="text-align:Left;"><DIV><DIV><P><SPAN>The S_Datum_Conv_Pt table is required when a countywide/community-based or flooding sourced- based vertical datum conversion was performed as part of the Flood Risk Project. It is not required for a passive vertical datum conversion. The Vertical Datum Conversion Guidance document should be referenced to determine which type of factor must be calculated. See also the FIRM Database Guidance document for additional information about datum conversion points. The spatial elements representing this layer are points. There cannot be a mixture of countywide/community-based and flooding source-based conversion factors within one FIRM Database. This information is needed for the Countywide Vertical Datum Conversion and Flooding Source-Based Vertical Datum Conversion tables in the FIS Report. </SPAN></P></DIV></DIV></DIV>
Description: <DIV STYLE="text-align:Left;"><DIV><DIV><P><SPAN>S_Gage table contains information about riverine gages for the Flood Risk Project area. Coastal gages are stored in S_Cst_Gage. This table is required for all new studies containing riverine analysis and should be populated with available data from existing studies when possible. The spatial location of these gages may be some distance from areas from which flood hazards were determined. A spatial file with location information also corresponds with this data table. This information is needed for the Stream Gage Information Used to Determine Discharges table in the FIS Report. </SPAN></P></DIV></DIV></DIV>
Description: <DIV STYLE="text-align:Left;"><DIV><DIV><P><SPAN>S_HWM table contains information about high water marks (HWMs) for the Flood Risk Project area. This table is required for Preliminary and Final FIRM Databases when the community has provided high water mark data. A spatial file with location information also corresponds with this data table. This table is used for the Historic Flooding Elevations table in the FIS Report, if this information is available. The spatial entities representing the high water marks are points. </SPAN></P></DIV></DIV></DIV>
Description: <DIV STYLE="text-align:Left;"><DIV><DIV><P><SPAN>The S_Nodes layer is required for non-coastal hydrologic analyses where nodes were defined as part of the analysis. The contributing drainage area and the discharges for all frequencies required for the Flood Risk Project (e.g., the 10-percent, 2-percent, 1-percent and 0.2-percent-annual-chance floods) represent the discharges based on the cumulative upstream drainage area. Nodes can represent sub basin outlets, junctions, reservoirs, structures or diversions. Note that nodes are required at all flow change locations. This information is used in the following tables in the FIS Report: Summary of Discharges, Summary of Summary of Non-Coastal Stillwater Elevations and Flood Hazard and Non- Encroachment Data for Selected Streams. In addition to hydrologic modeling usage, for situations where cross sections are not integral to modeling, the cross section spatial file should not be submitted, and the water-surface elevations must be reported in the L_Summary_Elevations file at the corresponding node. A node should be placed in areas with non-coastal static BFEs and a corresponding L_Summary_Elev record entered for each event type for the NODE_ID unless the Region determines that the flood sources do not warrant inclusion in the FIS Report. </SPAN></P></DIV></DIV></DIV>
Description: <DIV STYLE="text-align:Left;"><DIV><P><SPAN>The S_Riv_Mrk table contains information about the river marks shown on the FIRM if applicable. A spatial file with location information also corresponds with this data table. The spatial entities representing the river marks are points. The points are generally located along the centerline of the river at regular intervals or as indicated by the data source. </SPAN></P></DIV></DIV>
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Description: <DIV STYLE="text-align:Left;"><DIV><DIV><P><SPAN>This table is required for any FIRM Database that has an S_Profil_Basln, S_Riv_Mrk or L_XS_Elev table. It is used to populate the Floodway Data Tables and Flood Profiles, as well as the Flood Hazard and Non-Encroachment Data for Selected Streams table in the FIS Report. The S_Stn_Start table contains information about station starting locations. These locations indicate the reference point that was used as the origin for distance measurements along streams and rivers. This table is referenced by both the L_XS_Elev table, which contains stream station information for cross sections and the S_Riv_Mrk table, which contains river distance marker points. </SPAN></P></DIV></DIV></DIV>
Description: <DIV STYLE="text-align:Left;"><DIV><P><SPAN>The S_Fld_Haz_Ln table contains information about the flood zone boundary features for the Flood Risk Project area. A spatial file with location information also corresponds with this data table. Flood hazard data should not be shown beyond the extent of the county/community boundary. If the modeled information extends beyond the political area, the flood hazard data should be clipped to the political boundary. The spatial elements representing the boundaries of the flood hazard areas depicted on the FIRM are lines. </SPAN></P></DIV></DIV>
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Description: <DIV STYLE="text-align:Left;"><DIV><DIV><P><SPAN>The S_Fld_Haz_Ar table contains information about the flood hazards within the Flood Risk Project area. A spatial file with location information also corresponds with this data table. These zones are used by FEMA to designate the Special Flood Hazard Area (SFHA) and for insurance rating purposes. These data are the regulatory flood zones designated by FEMA. The spatial elements representing the flood zones are polygons. The entire area of the jurisdiction(s) mapped by the FIRM should have a corresponding flood zone polygon. There is one polygon for each contiguous flood zone designated. </SPAN></P></DIV></DIV></DIV>
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