Description: 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.
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Description: The profile baseline shows the path of flood flows on the FIRM and is an accurate representation of the distance between cross sections, structures, nodes, or grids in the hydraulic model. The profile baseline is used for replicating the stationing and water-surface elevations found in the FIS report profiles, but in GIS format. This information is used in the following tables within the FIS report: Flooding Sources Included in this FIS report, Principal Flood Problems, Summary of Hydrologic and Hydraulic Analyses, Summary of Topographic Elevation Data Used in Mapping, the Stream-by_Stream Vertical Datum Conversion, and Summary of Contracted Studies Included in this FIS Report.
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Description: Location and attributes for hydrography features shown on FIRM as lines.
The S_Wtr_Ln table contains information about surface water linear features. The spatial elements representing surface water line features are lines. Normally stream centerlines will be represented as line features. However, the main purpose of the S_Wtr_Ar table and the S_Wtr_Ln table is to provide a cartographic depiction of the surface water features for visual interpretation of the mapping data. As a result, the method for structuring surface water features as lines or polygons is very flexible. Lake shorelines and stream channel banks used to show lakes and wide rivers may be represented as polygons. However, they may be represented as lines based on the structure of the data received and the mapping partner’s discretion. Surface water features may appear in either the S_Wtr_Ar table or the S_Wtr_Ln table or both. The hydrologic structure of the modeled stream network will be represented by the S_Profil_Basln layer. This information is used in the Transect Locator Map and the FIRM Panel Index in the FIS report, as well as the FIRM panels.
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Description: Normally, any FIRM that has associated flood profiles has cross sections. The S_XS table contains information about cross section lines. These lines usually represent the locations of channel surveys performed for input into the hydraulic model used to calculate flood elevations. Sometimes cross sections are interpolated between surveyed cross sections using high accuracy elevation data. Depending on the zone designation (Zone AE, Zone A, etc.), these locations may be shown on Flood Profiles in the FIS report and can be used to cross reference the Flood Profiles to the planimetric depiction of the flood hazards. This information is used in the Floodway Data Tables in the FIS report, as well as on the FIRM panels.
Description: This table includes levees, floodwalls, or dikes that have been designed for flood control, including those portions that are closure structures, whether or not they have been demonstrated to meet the NFIP requirements in 44 CFR 65.10. This information is shown in the Levees table in the FIS report and on the FIRM panels. The S_Levee table contains information about levees shown on the FIRMs that are accredited and known to be protecting against the 1-percent-annual-chance flood, as well as levees that are provisionally accredited, de-accredited, and never accredited. The purpose of this table is to document the accreditation status of levees, as well as associated information necessary to be shown on the FIRM and for the population of FIS report text related to levee structures. The spatial entities representing levees are lines, drawn at the centerline of levees, floodwalls, and levee closure structures.
Description: Location of areas updated in this flood risk project along with attributes associated with each submittal.
The S_Submittal_Info layer contains essential information about the flood risk project such as the FEMA case number and utilized engineering models. The spatial entities representing the flood risk project areas are polygons corresponding to the area to be revised by this case / the area covered by the FIRM being revised / the area where new hydraulic analyses are to be performed and/or the watershed boundaries of the catchments analyzed. These can be one or multiple irregular polygons that capture the extent of the flood risk project area(s). This information is used in the following tables in the FIS report: Summary of Contracted Studies Included in this FIS report, Summary of Hydrologic and Hydraulic Analyses, and Summary of Topographic Elevation Data Used in Mapping.
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Description: The S_Cst_Tsct_Ln table contains information about the Coastal Transect Lines within the flood risk project area, if applicable. The transect lines indicate the location that was used to provide representative topographic information for the coastal flood models used. Hydraulic analyses of coastal flood effects are executed along transects, which are cross sections taken perpendicular to the shoreline, representing a segment of coast with similar characteristics. Transect elevations are interpolated to delineate the coastal flood zones. The spatial elements representing coastal transects are lines that generally extend from offshore all the way across the coastal floodplain. Transects can also extend seaward when wave runup modeling is used to determine coastal flood hazards. This information is needed for the Transect Locator Map table and Coastal Transect Parameters table in the FIS report.
Description: The S_Tsct_Basln spatial file contains information about the transect baseline used in the coastal flood hazard model. Typically, the S_Tsct_Basln represents the 0.0-foot elevation contour, the starting point for the transect, and the measuring point for the coastal mapping. The spatial elements representing the transect baselines are lines. When a coastal transect baseline and water lines are available for the same study reach, only the transect baseline shall be shown on the FIRM in order to eliminate overlaps. This information is used in the following tables in the FIS report: Transect Locator Map, as well as in the Flooding Sources Included this FIS Report, Summary of Coastal Analyses, Summary of Topographic Elevation Data Used in Mapping, and Coastal Transect Parameters.
Description: This table includes levees, floodwalls, or dikes that have been designed for flood control, including those portions that are closure structures, whether or not they have been demonstrated to meet the NFIP requirements in 44 CFR 65.10. This information is shown in the Levees table in the FIS report and on the FIRM panels. The S_Levee table contains information about levees shown on the FIRMs that are accredited and known to be protecting against the 1-percent-annual-chance flood, as well as levees that are provisionally accredited, de-accredited, and never accredited. The purpose of this table is to document the accreditation status of levees, as well as associated information necessary to be shown on the FIRM and for the population of FIS report text related to levee structures. The spatial entities representing levees are lines, drawn at the centerline of levees, floodwalls, and levee closure structures.
Description: The S_LiMWA layer is used when a Limit of Moderate Wave Action (LiMWA, previously described as a Coastal Zone A boundary line) is delineated within the coastal floodplain. The spatial entities representing the LiMWA are lines. The line represents the limit of 1.5-foot or greater waves in a Coastal AE Zone.
Only LiMWA features depicted on the FIRM are shown.
Description: The S_Fld_Haz_Ln table contains information about the flood zone boundary features for the flood risk project area. Three types of flood hazard lines exist. These are: SFHA / FLOOD ZONE BOUNDARY, LIMIT LINES, and OTHER BOUNDARY. All lines that are associated with flood hazard zone boundaries are coded in the LN_TYP field as SFHA / FLOOD ZONE BOUNDARY, with the exception of LIMIT LINES. OTHER BOUNDARY line types include lines that indicate different source citations, apparent limits, or the end of spatial extents. OTHER BOUNDARY lines are not shown on the FIRM.
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Description: The S_Fld_Haz_Ar table contains information about the flood hazards within the flood risk project area. These zones are used by FEMA to designate the SFHA and for insurance rating purposes. These data are the regulatory flood zones designated by FEMA.
Value: X;AREA WITH REDUCED FLOOD HAZARD DUE TO PROVISIONALLY ACCREDITED LEVEE SYSTEM Label: Area with Reduced Risk Due to Levee Description: N/A Symbol:
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