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• W2079339544 abstract "Research Article| April 01, 2003 Hydrogeology and Water Resource Potential of Neogene Sediments in the Tualatin Basin and Comparison with the Neighboring Portland Basin, Northwest Oregon DOYLE C. WILSON DOYLE C. WILSON 1Geology Department, Portland State University, Portland, OR 97207-0751 1Current address: Mohave Community College, 1977 W. Acoma Blvd., Lake Havasu City, AZ 86403 Search for other works by this author on: GSW Google Scholar Author and Article Information DOYLE C. WILSON 1Current address: Mohave Community College, 1977 W. Acoma Blvd., Lake Havasu City, AZ 86403 1Geology Department, Portland State University, Portland, OR 97207-0751 Publisher: Association of Environmental & Engineering Geologists First Online: 02 Mar 2017 Online ISSN: 1558-9161 Print ISSN: 1078-7275 Copyright © 2003 Geological Society of America Environmental & Engineering Geoscience (2003) 9 (4): 327–338. https://doi.org/10.2113/9.4.327 Article history First Online: 02 Mar 2017 Cite View This Citation Add to Citation Manager Share Icon Share Facebook Twitter LinkedIn MailTo Tools Icon Tools Get Permissions Search Site Citation DOYLE C. WILSON; Hydrogeology and Water Resource Potential of Neogene Sediments in the Tualatin Basin and Comparison with the Neighboring Portland Basin, Northwest Oregon. Environmental & Engineering Geoscience 2003;; 9 (4): 327–338. doi: https://doi.org/10.2113/9.4.327 Download citation file: Ris (Zotero) Refmanager EasyBib Bookends Mendeley Papers EndNote RefWorks BibTex toolbar search Search Dropdown Menu toolbar search search input Search input auto suggest filter your search All ContentBy SocietyEnvironmental & Engineering Geoscience Search Advanced Search Abstract Hydrogeologic properties of the Neogene Hillsboro Formation and Willamette Silt in the Tualatin basin are evaluated to provide a foundation for future groundwater use in the Portland, Oregon, metropolitan area, and are then compared to hydrogeological conditions in the neighboring Portland basin. Catastrophic flood deposits of the Willamette Silt in the Tualatin Valley have low hydraulic conductivities and well yields below 7 gpm (26.5 lpm). Fluvial sand aquifers within the Hillsboro Formation compose only 20 percent of the 1,400-ft (450-m) thick unit and most contain a significant quantity of silt and clay, with hydraulic conductivities on the order of 2–30 ft/day (0.6–6 m/day). Water quality is good, yet low well yields (6–100 gpm; 23–380 lpm), a low hydraulic gradient within the basin, and geochemical data point to residence times of tens to hundreds of years and slow recharge to the system. A numerical simulation verifies slow groundwater velocities and the presence of local and regional flow regimes. Aquifers of the Hillsboro Formation are limited to domestic use, and model simulations of hypothetical well fields show that these aquifers would not support large-scale withdrawals. High-yield aquifers of the coarse-grained Troutdale Formation in the Portland basin contrast sharply with those of the Hillsboro Formation and Willamette Silt in that they can be separated into multiple hydrogeologic units, have high hydraulic conductivities, and can be used for municipal purposes. Such drastic differences in hydrogeologic characteristics within a metropolitan area require different strategies involving groundwater use or remediation. You do not have access to this content, please speak to your institutional administrator if you feel you should have access." @default.
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• W2079339544 title "Hydrogeology and Water Resource Potential of Neogene Sediments in the Tualatin Basin and Comparison with the Neighboring Portland Basin, Northwest Oregon" @default.
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