43 research outputs found
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A Resource survey of the hydroelectric potential at existing and proposed dams in Oregon
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Streamflow data requirements to assess micro-hydropower potential for small rainfall-regime basins in western Oregon
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Micro-hydropower : Oregon development guide
Published January 1982. Facts and recommendations in this publication may no longer be valid. Please look for up-to-date information in the OSU Extension Catalog: http://extension.oregonstate.edu/catalo
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Investigation of motorboat-induced streambank erosion on the Lower Deschutes River
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Streambank erosion protection and channel scour manipulation using rockfill dikes and gabions
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Gravel disturbance impacts on salmon habitat and stream health : volume 1 : summary report
In this report, a response is given to the charge of this study. Volume I: Summary Report includes a synopsis of the technical considerations followed by the main findings and recommendations. The full technical background for these summary statements is given in detail in Volume II: Technical Background Report, and is intended for the reader who seeks the supporting information and documentation.
A report for the Oregon Division of State Lands.v. 1. Summary repor
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Estimating the frequency and quantity of surface runoff within the Tualatin River Basin
The Tualatin River Basin along the east side of the Coastal Mountains in Oregon is subject to a complex mixture of land uses. Approximately half the area is devoted to forestry production. The remainder is divided between agriculture and urban uses. In addition to this diversity in land use, there is a dramatic change in terrain from the upper forested areas to the flat basin floor where the river velocity becomes extremely slow.
During the summer months, there is relatively little rainfall in the Basin; high evaporation rates and generally dry soil profiles cause warm-season runoff to be rare. As a result, the flow in the Tualatin River consists of discharge from the upstream reservoir, groundwater inflow along the river and its tributaries, and effluent from the two major sewage treatment plants within the Basin. There are additionally several other point sources within the Basin; however, their total discharge is insignificant compared to the above sources. Groundwater inflow as used in this document includes any water flowing through the soil profile into a stream, including irrigation water that has been applied and infiltrated into the soil.
Estimating the frequency with which surface runoff enters the Tualatin River or one ofit major tributaries is important in the selection of a pollution control strategy. The possibility of surface runoff-transported pollutants contributing to late summer elevated nutrient conditions in the lower reaches of the River requires that either there be surface runoff during the dry months or that runoff transported materials that enter the streams during the months of higher rainfall are stored in the stream and become somehow freed during the summer due to temperature change or some other phenomenon.
The purpose of this analysis is to detennine the frequency of surface runoff from various land areas within the Tualatin River Basin during the various months of the year. Several variables determine whether precipitation in the Basin will cause runoff in the Tualatin River or its tributaries. This analysis assumes that the two most important variables are land use and soil moisture holding capacity. Various studies have been conducted in the past to explore these topics. The purpose of this paper is to organize that thinking and apply it to the Tualatin River Basin
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Preliminary summary of aggregate mining in Oregon with emphasis in the Willamette River Basin
The purpose of this study is to summarize the technical information on aggregate mining in Oregon including updates of supply and demand since the last comprehensive forecasting of aggregate demand completed by Whelan (1995). Aggregate is a term that numerous definitions, but as used herein, aggregate is sand, gravel, and crushed rock used in the construction of roads and buildings. Aggregate resources within Oregon also include recycled materials. This study also attempts to assess the number of acres of Prime or High Value Soils that have been taken out of farm production by currently operating aggregate mines located along the floodplain of the Willamette River Basin in Oregon. The importance of investigating the relationship of Prime or High Value Soils and aggregate resources is that both resources often times are collocated. The study includes general information regarding many regions of Oregon, but the analysis focuses on the Willamette River Basin because (1) the bulk of Prime or High Value Soils are located in this area, and (2) the readily available digital data needed to complete spatial analyses of sand and gravel mines and soils distribution using Geographic Information Systems (GIS) are limited to this area
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