Description: The extraction process runs every night. If it finds any changes in FloodZones_FEMA, it will update thie feature class.This data reflects the changes FEMA is proposing for the Thurston County DFIRM (Digital Flood Insurance Rate Maps) base elevation adjustment. This is the first of several changes to be made to the Thurston County floodzone over the next 5 years. The floodzone boundaries have been adjusted to match the new base flood elevation standard. This change involved transforming the BFE from NAD 27 to NAD 83, which resulted a a shift of several feet.
Service Item Id: 2a46896d8c8243fba68601c91d283f37
Copyright Text: This data was created by, and is maintained by FEMA. Please refer to www.fema.gov for full metadata and mapping status information, Thurston County Emergency Management (360-754-3360) or the Thurston County Floodplain Administrator for additional information.
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)
Description: The Flood Insurance Rate Map (FIRM) Database depicts flood risk information and supporting data used to develop the risk data. The primary risk classifications used are the 1-percent-annual-chance flood event, the 0.2-percent-annual-chance flood event, and areas of minimal flood risk. The FIRM Database is derived from Flood Insurance Studies (FISs), previously published FIRMs, flood hazard analyses performed in support of the FISs and FIRMs, and new mapping data, where available. The FISs and FIRMs are published by the Federal Emergency Management Agency (FEMA). This file is georeferenced to the Earth's surface using the Geographic Coordinate System (GCS) and North American Datum of 1983.
Service Item Id: 2a46896d8c8243fba68601c91d283f37
Copyright Text: Federal Emergency Management Agency (FEMA)
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