View In:   ArcGIS Online Map Viewer

Name: High Groundwater Hazard Areas

Display Field: EDITOR_NAME

Type: Feature Layer

Geometry Type: esriGeometryPolygon

Description: The purpose of this data is to provide planners with a history of flooding events recorded in the county. This information is compiled using authoritative data and represents the approximate mapped location of documented high groundwater flooding events for the purposes of screening. Authoritative data includes, but is not limited to, the 1997 WA State DOT infrared aerial photography. Beginning in 2016 updates to this layer began, and are in progress, to eliminate shadowing and map high groundwater using digital versions of the 1997 Aerial Photography (not available when the layer was first created) and LiDAR Contour data. All edits are verified by the County Hydrogeologist and Flood Plain Manager before being incorporated into the data. Edits are made on a case-by-case basis as time allows and when discrepancies are found and researched. For information about changes or making a change please contact Tim Rubert, Flood Plain Manager, with Thurston County. High ground water hazard areas as defined in the Thurston County Critical Areas Ordinance Chapter 24.20, adopted on July 24, 2012 Or No 14773. 24.20.015 High ground water flood hazard areas – Base flood elevation. The base flood elevation (BFE) for high ground water flood hazard areas corresponds to the elevation of the outer edge of the high ground water flood hazard area. The map entitled “High Ground Water Flood Hazard Areas,” depicts the approximate location of the high groundwater flood hazard area. The actual location of the outer edge of the flood hazard area shall be determined consistent with TCC 24.20.030 and 24.20.035, as applicable.Updated by kah on November 20, 2017

Service Item Id: 2a46896d8c8243fba68601c91d283f37

Copyright Text: Thurston County Community Planning and Economic Development (CPED)

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YMin: 5903602.372699998
XMax: -1.3629800388700001E7
YMax: 5969580.681999996
Spatial Reference: 102100  (3857)

Drawing Info:

Renderer:
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Field 2: SalmonCreek
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UniqueValueInfos:
• Value: High Groundwater,No
  Label: High Groundwater Hazard Area
  Description: N/A
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ID: High Groundwater
Name: High Groundwater Hazard Area
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