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Chehalis Basin 100-year Floodplain - High-end Climate Change Projection [Washington (State)]

State of Washington Geospatial Open Data Portal · 2023 Full Details

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Title
Chehalis Basin 100-year Floodplain - High-end Climate Change Projection [Washington (State)]
Description
These 100-year floodplain boundaries are intended to provide information about future inundation extents throughout the Chehalis River basin based on high-end climate change projections. These data are not officially endorsed by Federal or Washington State agencies, and are intended for planning use only.This shapefile contains 100-year floodplain boundaries generated from a combination of hydraulic model results and topgraphic data geoprocessing. The boundaries were derived using the University of Washington Climate Impact Group's estimate of the high range of anticipated change to rainfall in 2080 - a 50% increase in precipitation - using downscaled climate model data for the Chehalis Basin region.Details of the methods used to derive these floodplain extents are documented in a technical memorandum available from Watershed Science and Engineering (2021).
Creator
Colin Butler, Watershed Science & Engineering, Staff Hydraulic Engineer
Publisher
State of Washington Geospatial Open Data Portal
Temporal Coverage
Last Modified: 2023-03-22
Date Issued
2021-07-15
Rights
Category 1 - Public Information. These data can be shared publicly. The Washington State Department of Ecology (Ecology) provides these geographic data "as is" without a warranty of any kind, either expressed or implied, including but not limited to the implied warranties of merchantability, accuracy, fitness for a particular use and/or non-infringement. In no event shall Ecology have any liability whatsoever for payment of any consequential, incidental, indirect, special, or tort damages of any kind, including, but not limited to, any loss of profits arising out of use of or reliance on the geographical data or arising out of the delivery, installation, operation, or support by Ecology. Ecology reserves the right to change this policy at any time without notice. Any legal questions regarding this copyright notice and disclaimer, or other questions regarding the use of the material from Ecology's Web sites, may be directed to Web Communications Manager , Washington State Department of Ecology, PO Box 47600, Olympia, WA 98504-7600, 360-407-6590. https://ecology.wa.gov/About-us/Accountability-transparency/Website-information/Copyright-information
Access Rights
Public
Format
ArcGIS FeatureLayer
Language
English
Date Added
August 10, 2025
Provenance Statement
The metadata for this resource was last retrieved from State of Washington Geospatial Open Data Portal on 2026-01-08.

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Cite and Reference

  • Citation
    Colin Butler, Watershed Science & Engineering, Staff Hydraulic Engineer (2021). Chehalis Basin 100-year Floodplain - High-end Climate Change Projection [Washington (State)]. State of Washington Geospatial Open Data Portal. https://geo.wa.gov/datasets/waecy::chehalis-basin-100-year-floodplain-high-end-climate-change-projection (web service)
  • BTAA Geoportal Link

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