ECA Flood Prone Areas

FEMA flood prone areas with 100 foot buffer. Original flood prone areas where table digitized into the City of Seattle GIS CGDB control layer in the mid 90's. Layer may be used without the buffer by unselecting the flood = 1 feature type.This layer is used by the City as an aid to evaluate construction sites for the presence of flood prone areas pertinent to Environmentally Critical Areas (ECA) regulations.Areas that would likely be covered with or carry water as a result of a one hundred (100) year flood event, or that would have a one percent (1%) or greater chance of being covered with or of carrying water in any given year based on current circumstances or maximum development permitted under existing zoning.For more information about the definition of flood prone areas, see Seattle Municipal Code section 25.09.012, Environmentally Critical Areas (ECA) definitions. Updated as needed.

Data and Resources

Field	Value
accessLevel	public
catalog_@context	https://project-open-data.cio.gov/v1.1/schema/catalog.jsonld
catalog_@id	https://cos-data.seattle.gov/data.json
catalog_conformsTo	https://project-open-data.cio.gov/v1.1/schema
catalog_describedBy	https://project-open-data.cio.gov/v1.1/schema/catalog.json
identifier	https://www.arcgis.com/home/item.html?id=80c34d2b66e840c29ce92b74abbf13f0&sublayer=0
issued	2023-07-06
landingPage	https://data-seattlecitygis.opendata.arcgis.com/datasets/SeattleCityGIS::eca-flood-prone-areas-1
metadata_type	geospatial
modified	2024-08-08
old-spatial	-122.4344,47.4927,-122.2729,47.7356
publisher	City of Seattle ArcGIS Online
resource-type	Dataset
source_datajson_identifier	true
source_hash	882798740ebcff853903957daed16bdf3267239dac79c696813132a7aa8b005c
source_schema_version	1.1
spatial	{"type": "Polygon", "coordinates": [[[-122.4344, 47.4927], [-122.4344, 47.7356], [-122.2729, 47.7356], [-122.2729, 47.4927], [-122.4344, 47.4927]]]}
theme	{geospatial}
Groups	AmeriGEOSS National Provider North America
Tags	AmeriGEO AmeriGEOSS CKAN GEO GEOSS National North America United States eca environmental flood-prone-areas landuse planning sdci seattle-gis-open-data terrain
isopen	False
license_id	notspecified
license_title	License not specified
maintainer	SDCI_SeattleCityGIS
maintainer_email	mapgis.mapgis@seattle.gov
metadata_created	2025-09-23T20:06:07.479989
metadata_modified	2025-09-23T20:06:07.479996
notes	<div style='font-family:"Avenir Next W01", "Avenir Next W00", "Avenir Next", Avenir, "Helvetica Neue", sans-serif; font-size:16px;'>FEMA flood prone areas with 100 foot buffer. Original flood prone areas where table digitized into the City of Seattle GIS CGDB control layer in the mid 90's. Layer may be used without the buffer by unselecting the flood = 1 feature type.</div><div style='font-family:"Avenir Next W01", "Avenir Next W00", "Avenir Next", Avenir, "Helvetica Neue", sans-serif; font-size:16px;'></div><div style='font-family:"Avenir Next W01", "Avenir Next W00", "Avenir Next", Avenir, "Helvetica Neue", sans-serif; font-size:16px;'>This layer is used by the City as an aid to evaluate construction sites for the presence of flood prone areas pertinent to Environmentally Critical Areas (ECA) regulations.</div><div style='font-family:"Avenir Next W01", "Avenir Next W00", "Avenir Next", Avenir, "Helvetica Neue", sans-serif; font-size:16px;'><br /></div><div style='font-family:"Avenir Next W01", "Avenir Next W00", "Avenir Next", Avenir, "Helvetica Neue", sans-serif; font-size:16px;'>Areas that would likely be covered with or carry water as a result of a one hundred (100) year flood event, or that would have a one percent (1%) or greater chance of being covered with or of carrying water in any given year based on current circumstances or maximum development permitted under existing zoning.</div><div style='font-family:"Avenir Next W01", "Avenir Next W00", "Avenir Next", Avenir, "Helvetica Neue", sans-serif; font-size:16px;'><br /></div><div style='font-family:"Avenir Next W01", "Avenir Next W00", "Avenir Next", Avenir, "Helvetica Neue", sans-serif; font-size:16px;'><font style='font-family:inherit;'>For more information about the definition of flood prone areas, see </font><a href='https://library.municode.com/wa/seattle/codes/municipal_code?nodeId=TIT25ENPRHIPR_CH25.09REENCRAR' style='color:rgb(0, 121, 193); text-decoration-line:none;' target='_blank' rel='nofollow ugc noopener noreferrer'>Seattle Municipal Code section 25.09.012</a><font style='font-family:inherit;'>, Environmentally Critical Areas (ECA) definitions. </font><br /></div><div style='font-family:"Avenir Next W01", "Avenir Next W00", "Avenir Next", Avenir, "Helvetica Neue", sans-serif; font-size:16px;'><br /></div><div style='font-family:"Avenir Next W01", "Avenir Next W00", "Avenir Next", Avenir, "Helvetica Neue", sans-serif; font-size:16px;'>Updated as needed.</div>
num_resources	11
num_tags	16
title	ECA Flood Prone Areas