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201 S. Jackson St.
Suite 706
Seattle, WA 98104
giscenter@kingcounty.gov

+ 47.59909 N
- 122.33136 W

+ 47°  35' 56.72"
- 122° 19' 52.90"

 

FEMA High Risk Flood Area (100-year Floodplain)

Description | Contacts | Attribute Information | Constraints

Data layer thumbnail image

Description

Layer name: FEMA_FLOODPLAIN_100YR
Subject category: hydro
Title: FEMA High Risk Flood Area (100-year Floodplain)
Feature Count: 2254
Feature Type: Polygon
Abstract: 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.
Purpose: 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
Status: Complete
Updated: As needed
Time period of content: (single date,as YYYYMMDD)::
Time period of content: (date range, as YYYYMMDD):: -
Spatial reference: WA State Plane North
FGDC Documentation: Classic or FAQ
Open Data Availability: Unknown
Place Keywords: Pacific NW, King County, WA, Washington state,
Theme Keywords: Floodplain, Flood, FEMA, Hydro, Rivers, Environment, Hazard, environment,
Lineage: Available

Contacts

Maintained by:
King County DNRP
Primary: Ken Zweig, Program Manager, 206-477-4732
(How to e-mail a County contact)
Secondary: KCGIS Center; giscenter@kingcounty.gov. This mailbox is monitored during business hours.

Attribute Information

ItemDescriptionDomain
_FLD_AR_ID_Unique ID
_FLD_ZONE_Flood Zone
AAn area inundated by 1% annual chance flooding, for which no BFEs have been determined
AEAn area inundated by 1% annual chance flooding, for which BFEs have been determined
AHAn 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
AOAn 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 WATEROpen Water
VEAn area inundated by 1% annual chance flooding with velocity hazard; (wave action); BFEs have been determined
_FLOODWAY_Floodway
FLOODWAY
_SFHA_TF_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.
F
T
_STATIC_BFE_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.
_V_DATUM_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.
NAVD88
_DEPTH__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.
-9999.0No Data
1.01'
2.02'
3.03'
_LEN_UNIT_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.
FEET
_SOURCE_CIT_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.
BASE1
FIRM1
LOMC10
LOMC11
LOMC12
LOMC13
LOMC14
LOMC2
LOMC3
LOMC4
LOMC6
LOMC7
LOMC8
LOMC9
STUDY1
STUDY2
STUDY3
_Shape.STArea()_
_Shape.STLength()_


Constraints

Access: Access Constraint: Data available on King County GIS Open Data: https://gis-kingcounty.opendata.arcgis.com/

Use: Use Constraint: King County data are made available with the understanding that they shall be used exclusively by the obtainer or his/her authorized agents. Digital products may not be reproduced or redistributed in any form or by any means without the express written authorization of King County.