GIS Data Catalog

FEMA High Risk Flood Area (100-year Floodplain)

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Summary

Provides the location of the pending FEMA 100-year floodplain.

This information is intended for informational purposes only, and should not be used for parcel level determinations

Description

100 year floodplain are areas that will be inundated by the flood event having a 1-percent chance of being equaled or exceeded in any given year, derived from FEMA Flood Insurance Rate Maps.

Layer information

Layer Name	fema_floodplain_100yr_area
Subject Category	Hydrography
Title	FEMA High Risk Flood Area (100-year Floodplain)
Feature Count	2319
Feature Type	Polygon
Next Update	As needed
Spatial reference	EPSG:2926
Control ID	2853
Place Keywords	Pacific NW, King County, WA, Washington State
Theme Keywords	Floodplain, Flood, FEMA, Hydro, Rivers, Environment, Hazard, Environment
Supplemental Information	None

Table Preview

Attribute information

OBJECTID From Esri	Description Internal feature number. Domain Sequential unique whole numbers that are automatically generated.
FLD_AR_ID From FEMA	Description Unique ID Domain Not Found
FLD_ZONE From FEMA	Description Flood Zone Domain A - An area inundated by 1% annual chance flooding, for which no BFEs have been determined AE - An area inundated by 1% annual chance flooding, for which BFEs have been determined AH - An area inundated by 1% annual chance flooding (usually an area of ponding), for which BFEs have been determined; flood depths range from 1 to 3 feet AO - An area inundated by 1% annual chance flooding (usually sheet flow on sloping terrain), for which average depths have been determined; flood depths range from 1 to 3 feet OPEN WATER - Open Water VE - An area inundated by 1% annual chance flooding with velocity hazard; (wave action); BFEs have been determined
FLOODWAY From FEMA	Description Floodway Domain FLOODWAY
SFHA_TF From FEMA	Description Special Flood Hazard Area. If the area is within a SFHA this field would be true. This field will be true for any area coded as an A or V flood zone area. It should be false for any X or D flood areas. Acceptable values for this field are listed in the D_TrueFalse table. Domain F, T
STATIC_BFE From FEMA	Description Static Base Flood Elevation. This field will be populated for areas that have been determined to have a constant Base Flood Elevation (BFE) over a flood zone. The BFE value will be shown beneath the zone label. In this situation the same BFE applies to the entire polygon. This normally occurs in lakes or coastal zones. NOTE: value of -9999 denotes no data. Domain Not Found
V_DATUM From FEMA	Description Vertical Datum. The vertical datum indicates the reference surface from which the flood elevations are measured. Normally this would be North American Vertical Datum of 1988 for new studies. This field is only populated if the STATIC_BFE field is populated. Acceptable values for this field are listed in the D_V_Datum table. Domain NAVD88
Shape From Esri	Description Feature geometry. Domain Coordinates defining the features.
DEPTH_ From FEMA	Description Depth This is the depth for Zone AO areas. This value is shown beneath the zone label on the FIRM. This field is only populated if a depth is shown on the FIRM. Domain -9999.0 - No Data 1.0 - 1' 2.0 - 2' 3.0 - 3'
LEN_UNIT From FEMA	Description Length Units. This unit indicates the measurement system used for the BFEs and/or depths. Normally this would be feet. This field is only populated if the STATIC_BFE or DEPTH field is populated. Acceptable values for this field are listed in the D_Length_Units table. Domain FEET
SOURCE_CIT From King County	Description Source Citation. Abbreviation used in the metadata file when describing the source information for the feature. The abbreviation must match a value in L_Source_Cit. Domain BASE1, FIRM1, LOMC10, LOMC11, LOMC12, LOMC13, LOMC14, LOMC2, LOMC3, LOMC4, LOMC6, LOMC7, LOMC8, LOMC9, STUDY1, STUDY2, STUDY3
Shape.STArea() From SQL Server	Description Returns the area of a geometry instance in square units, based on the spatial reference identifier (SRID) of the geometry. Domain Double
Shape.STLength() From SQL Server	Description Returns the total length of the elements in a geometry instance. Domain Double

Contact information

Maintained by	DNRP - Water and Land Resources
Primary	Harkeerat Kang Harkeerat.Kang@kingcounty.gov

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