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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 \u201c-8888\u201d. 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