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Hydrogeologic Framework, Groundwater and Surface-Water Systems, Land Use, Pumpage, and Water Budget of the Chamokane Creek Basin, Stevens County, Wash (in English)
William a. Taylor
(Author)
·
Sonja Lin
(Author)
·
Steven S. Sumioka
(Author)
·
Createspace Independent Publishing Platform
· Paperback
Hydrogeologic Framework, Groundwater and Surface-Water Systems, Land Use, Pumpage, and Water Budget of the Chamokane Creek Basin, Stevens County, Wash (in English) - Taylor, William a. ; Lin, Sonja ; Sumioka, Steven S.
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Synopsis "Hydrogeologic Framework, Groundwater and Surface-Water Systems, Land Use, Pumpage, and Water Budget of the Chamokane Creek Basin, Stevens County, Wash (in English)"
A study of the water resources of the unconsolidated groundwater system of the Chamokane Creek basin was conducted to determine the hydrogeologic framework, interactions of shallow and deep parts of the groundwater system with each other and the surface-water system, changes in land use and land cover, and water-use estimates. Chamokane Creek basin is a 179 mi2 area that borders and partially overlaps the Spokane Indian Reservation in southern Stevens County in northeastern Washington State. Aquifers within the Chamokane Creek basin are part of a sequence of glaciofluvial and glaciolacustrine sediment that may reach total thicknesses of about 600 ft. In 1979, most of the water rights in the Chamokane Creek basin were adjudicated by the United States District Court requiring regulation in favor of the Spokane Tribe of Indians' senior water right. The Spokane Tribe, the State of Washington, and the United States are concerned about the effects of additional groundwater development within the basin on Chamokane Creek. Information provided by this study will be used to evaluate the effects of potential increases in groundwater withdrawals on groundwater and surface-water resources within the basin. The hydrogeologic framework consists of six hydrogeologic units: The Upper outwash aquifer, the Landslide Unit, the Valley Confining Unit, the Lower Aquifer, the Basalt Unit, and the Bedrock Unit. The Upper outwash aquifer occurs along the valley floors of the study area and consists of sand, gravel, cobbles, boulders, with minor silt and (or) clay interbeds in places. The Lower aquifer is a confined aquifer consisting of sand and gravel that occurs at depth below the Valley confining unit. Median horizontal hydraulic conductivity values for the Upper outwash aquifer, Valley confining unit, Lower aquifer, and Basalt unit were estimated to be 540, 10, 19, and 3.7 ft/d, respectively.
