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Estimating the frequency and quantity of surface runoff within the Tualatin River Basin Öffentlichkeit Deposited

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https://ir.library.oregonstate.edu/concern/defaults/db78th11p

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  • 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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