Name: Preliminary FEMA FIRM cross sections

Display Field: WTR_NM

Type: Feature Layer

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Description: Preliminary FEMA FIRM Cross Sections displays revised preliminary Cross Sections updated as of January 31, 2025. The Preliminary FEMA FIRM Cross Sections data was downloaded from the FEMA site - https://hazards.fema.gov/femaportal/prelimdownload/searchLoad.action. It was saved in DATA  MAINTENANCE\FEMA\FEMAdwnload_8_12_25\FIRMDB_01312025_Clallam-County_Washington The data from the S_XS shapefile was copied into the SDE SQLServer-cc-sql-01-GeoData-dataowner.sde\DATAOWNER.prelim_FEMA_crosssections feature class and published to the portal. "The S_XS table contains information about cross section lines. This information is used in the Floodway Data Tables in the FIS Report, as well as on the FIRM panels. Database attributes should reflect the final regulatory water surface elevations that include any backwater elevations regardless of flood hazard zone and should be consistent with values in the floodway data tables and flood profiles, where applicable." - Guidance for Flood Risk Analysis and Mapping, FIRM Database Technical Reference. Fields: WTR_NM R Surface Water Feature Name. This is the name of the stream or water body.WSEL_REG R Regulatory Water Surface Elevation for the 1% annual-chance Flood Event. This is the regulatory water-surface elevation for the 1% annual-chance flood event in the stream channel at this cross section, this should include backwater elevations. In the case of levee(s) associated with a cross section, it is assumed that the levee(s) holds. For cross sections in the coastal floodplain, this value should be coded “-8888”. For cross sections in the combined coastal and riverine floodplain, this value should reflect the results of the combined rate of occurrence analysis. For cross sections at confluences where a single water surface elevation cannot be determined this value should be coded as “-8888”. This field is stored here and in L_XS_Elev to simplify annotation of the FIRM panel water-surface elevation at this cross section. This value and the corresponding value in L_XS_Elev should match.V_DATUM R Vertical Datum. The vertical datum indicates the reference surface from which the flood and streambed elevations are measured. Normally, this would be NAVD88. Acceptable values for this field are listed in the D_V_Datum table.

Service Item Id: 4eb40e6c662443bc924610ffb2687dbe

Copyright Text: Federal Emergency Management Agency Federal Insurance and Mitigation Administration 500 C Street, S.W. Washington District of Columbia 20472 USA 1-877-336-2627 fema-riskmap-ithelp@fema.dhs.gov

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Fields:

• OBJECTID ( type: esriFieldTypeInteger, alias: Relic Object Identifier )
• WTR_NM ( type: esriFieldTypeString, alias: Surface Water Feature Name, length: 100 )
• WSEL_REG ( type: esriFieldTypeDouble, alias: Regulatory Water Surface Elevation )
• V_DATUM ( type: esriFieldTypeString, alias: Vertical Datum, length: 17 )
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