Hydrogeology Of The Little Spokane River Basin Spokane Stevens And Pend Oreilles Counties Washington

Author : Veit J. Matt
Publisher :
ISBN 13 :
Total Pages : 418 pages
Book Rating : 4.:/5 (31 download)

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Download or read book Hydrology and Hydrogeology of the Spokane Indian Reservation, Northeastern Washington State written by Veit J. Matt and published by . This book was released on 1994 with total page 418 pages. Available in PDF, EPUB and Kindle. Book excerpt: "The Spokane Indian Reservation is located in northeastern Washington state in the southwestern part of Stevens County. The trust area is bordered by the Spokane River on the south and Lake Roosevelt on the west, while Chamokane Creek forms the eastern boundary. Four major drainage basins lie on the Spokane Reservation, including Little Chamokane Creek in the eastern part, Blue Creek and Sand Creek in the central region, and the internally drained McCoy Lake basin in the west. Only a portion of the downstream portion of the Chamokane Creek basin is on the reservation. The definition of the geomorphology of the watersheds on the reservation is exclusively based on the topographic information on the 7.5 minute quadrangles sheets of the area. Drainage divides have been outlined, and the stream order of the creeks determined according to the surface water networks shown on the maps. The smallest characterized watersheds are second order basins. All the drainage basins and associated streams have been assigned a code and are entered into a database. Drainage basins and streams have been digitized to determine their area and length respectively, and based on this information drainage density, relief, and gradient of the watersheds have been calculated. Local climate data and river discharge records have also been compiled in a database. The Spokane Indian Reservation area can be subdivided into several groundwater provinces based on the geology. Aquifers are found in: a) Quaternary-age flood deposits, glacial outwash and lacustrine sediments in the Chamokane Creek valley, parts of the Little Chamokane Creek valley, in the McCoy Lake area, and along the Spokane and Columbia River; "b) Miocene-age basalts in the northeastern and the western part of the reservation; c) Eocene- age andesites in the McCoy Lake area; and d) crystalline rocks composed of Cretaceous and lower Tertiary intrusive rock, and Paleozoic/Precambrian metasediments, in the central part of the reservation. The determination of aquifer properties is based on the 1:100,000 scale geologic maps (Joseph, 1990a; 1990b; Waggoner, 1990a; 1990b), of the region and on information in water well log reports. Subsurface information in the logs, and the lithologic description included in the geologic maps delineate the aquifer systems on the reservation. A database has been compiled that lists the location, depth, water level, water-bearing strata, and well discharge rate for water wells on the reservation. A hydrogeologic characterization of each of the aquifer types has been made so that parameters for areas with little or no direct information can be extrapolated from similar regions with better known hydrogeologic properties. The extent of each individual aquifer has been delineated and an aquifer map has been compiled. The Spokane Indian Fish Hatchery is located in the eastern part of the reservation in the Chamokane Creek valley west of Ford, Washington. A high discharge well has been developed to supply the fish hatchery with a suitable volume of water for its generation, but during the last two years the discharge has become significantly lower than expected. To recommend a future course of action to increase the yield of groundwater at the site, the history of the operation of the well and the hatchery, and all pertinent hydrogeologic data have been gathered. A groundwater flow model is used to simulate the groundwater system in the vicinity of the well head. The results indicate that the discharge of the Metamooteles Springs is significantly influenced by the fish hatchery well."--Document.