The Lower Chehalis Watershed, also known as Water Resource Inventory Area (WRIA) 22, is located in western Washington. This watershed includes the Chehalis, Satsop, Wynoochee, and Wishkah rivers, and numerous tributary creeks and streams. Annual precipitation in the Lower Chehalis Watershed ranges from 40 inches in the lowland valleys to over 100 inches in the Cascade and Willapa foothills. Most of the precipitation arrives during the winter months when water demands are the lowest. Only a fraction becomes available for human and economic uses.
During the summer, the snowpack is gone, there is little rain, and naturally low stream flows are dependent on groundwater inflow. At the same time, water demands for human uses, including irrigation, are at the yearly maximum. This means that groundwater and surface water are least available when water demands are the highest
The WRIA 22 Lower Chehalis Watershed Water Availability Story Map Journal incorporates Ecology's traditional WRIA 22-Lower Chehalis Watershed Water Availability Focus Sheet with numerous watershed specific data sets to create an interactive and simple-to-use web application. After the introductory slide, each journal entry uses a separate ESRI ArcOnline web map to present data.
Data sets used to create this Story Map Journal include:
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