Name: High Groundwater Area

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Description: Last Updated on 9/7/2021 by SLS.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.

Service Item Id: b53cf61c6ece46a18ade8e3f146ff077

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

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