Influence of Cougar Reservoir Drawdown on Sediment and DDT Transport and Deposition in the McKenzie River Basin, Oregon, Water Years 2002-04

Anderson, Chauncey W.

doi:10.3133/sir20075164

Cited by 8 publications

(16 citation statements)

References 12 publications

(10 reference statements)

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“…S4). Th is period of elevated concentrations coincided with the refi lling of Cougar Reservoir following the drawdown period to modify the withdrawal structure (Anderson, 2007). Hypothesized eff ects of the reservoir drawdown and construction project that may have increased downstream DBP precursor concentrations included (i) release of OM from oxidized sediments and/or decomposing vegetation that grew on the exposed bed material during the drawdown period that was inundated when the reservoir was refi lled, and/or (ii) increases in DOM inputs from reservoir planktonic algal production in epilimnetic (10 to 20 m) water that was released to meet downstream temperature criteria.…”

Section: Watershed Trihalomethane and Haloacetic Acid Precursorsmentioning

confidence: 99%

Determining Sources of Dissolved Organic Carbon and Disinfection Byproduct Precursors to the McKenzie River, Oregon

Kraus

Anderson²,

Morgenstern

et al. 2010

J of Env Quality

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This study was conducted to determine the main sources of dissolved organic carbon (DOC) and disinfection byproduct (DBP) precursors to the McKenzie River, Oregon (USA). Water samples collected from the mainstem, tributaries, and reservoir outflows were analyzed for DOC concentration and DBP formation potentials (trihalomethanes [THMFPs] and haloacetic acids [HAAFPs]). In addition, optical properties (absorbance and fluorescence) of dissolved organic matter (DOM) were measured to provide insight into DOM composition and assess whether optical properties are useful proxies for DOC and DBP precursor concentrations. Optical properties indicative of composition suggest that DOM in the McKenzie River mainstem was primarily allochthonous--derived from soils and plant material in the upstream watershed. Downstream tributaries had higher DOC concentrations than mainstem sites (1.6 +/- 0.4 vs. 0.7 +/- 0.3 mg L(-1)) but comprised < 5% ofmainstem flows and had minimal effect on overall DBP precursor loads. Water exiting two large upstream reservoirs also had higher DOC concentrations than the mainstem site upstream of the reservoirs, but optical data did not support in situ algal production as a source of the added DOC during the study. Results suggest that the first major rain event in the fall contributes DOM with high DBP precursor content. Although there was interference in the absorbance spectra in downstream tributary samples, fluorescence data were strongly correlated to DOC concentration (R2 = 0.98), THMFP (R2 = 0.98), and HAAFP (R2 = 0.96). These results highlight the value of using optical measurements for identifying the concentration and sources of DBP precursors in watersheds, which will help drinking water utilities improve source water monitoring and management programs.

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Section: Watershed Trihalomethane and Haloacetic Acid Precursorsmentioning

confidence: 99%

Determining Sources of Dissolved Organic Carbon and Disinfection Byproduct Precursors to the McKenzie River, Oregon

Kraus

Anderson²,

Morgenstern

et al. 2010

J of Env Quality

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“…When regression models are developed with data that violate assumptions of normality and homoscedasticity, the models are less likely to apply over the range of expected conditions for the site, and large prediction errors may occur. Rasmussen and others (2009) recommend log transformations for development of estimated suspended sediment concentrations and loads as a function of continuous turbidity and (or) discharge data, and this approach has been used with success for suspended sediment and other selected variables in streams in Kansas (Rasmussen and others, 2008), Oregon (Uhrich and Bragg, 2003;Anderson, 2007), and Florida (Lietz and Debiak, 2005).…”

Section: Regression Modelsmentioning

confidence: 99%

“…However, log transformation can introduce a bias that needs to be corrected. Duan's Bias Correction Factor (Duan, 1983), or BCF, which converts the logarithmic residuals from the regression process into normal space and then averages them, has been used frequently in recent studies (Uhrich and Bragg, 2003;Anderson, 2007;Rasmussen and others, 2008) and is used by the USGS as part of a national protocol for surrogate prediction by regression models (Rasmussen and others, 2009). Other steps in the maintenance of data and regression modeling include graphical evaluation of the relations between independent and dependent variables (for example, figure 5), removal of outliers (if careful attempts to resolve them were unsuccessful), and evaluation of residuals for homoscedasticity (constant variance across the range of data; Rasmussen and others, 2009).…”

Section: Model Development and Selectionmentioning

confidence: 99%

“…By combining these concentration estimates with discharge information, constituent loads also can be estimated. For example, Uhrich and Bragg (2003), Anderson (2007), and Bragg and others (2007) performed similar calculations using continuous records of turbidity and discharge to estimate suspended sediment concentrations and loads in the North Santiam and McKenzie Rivers, respectively, in western Oregon.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Use of Continuous Monitors and Autosamplers to Predict Unmeasured Water-Quality Constituents in Tributaries of the Tualatin River, Oregon

Anderson¹,

Rounds²

2010

Scientific Investigations Report

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“…This is effectively reservoir flushing, and may be accompanied by a washout of sediments (Schenk & Bragg, ) as well as other fish species. Although there is some history of draining for passage and dam maintenance (Anderson, ), this strategy has not previously been evaluated for short‐ and longer‐term impacts to the reservoir community.…”

Section: Introductionmentioning

confidence: 99%

Short‐term reservoir draining to streambed for juvenile salmon passage and non‐native fish removal

et al. 2019

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Fish passage out of reservoirs is a critical issue for downstream movement of juvenile salmonids and other migratory species. Reservoirs can delay downstream migrations by juvenile salmon for months or years. Here, we examine whether a novel management activity implementing annual short‐term draining of a reservoir to streambed improves timely downstream migration of juvenile salmonids. We analyse 12 years of fish capture data from a screw trap located downstream of Fall Creek Reservoir (Oregon, USA) to examine changes in timing of passage out of the reservoir and to compare fish species composition pre‐ and post‐draining. We observed a contraction in the timing of downstream migration for juvenile Chinook Salmon and reduction of yearlings in years following draining. We suggest that briefly draining the reservoir to streambed leads to reduced abundance of warm‐water invasive fishes in the reservoir after it refills. These changes could decrease predation and shift competition between invasive and resident riverine‐adapted native fishes in the reservoir. Collectively, our findings suggest that this low‐cost reservoir management option may improve passage and connectivity for juvenile Chinook Salmon while also decreasing the abundance of invasive fish species in the reservoir. This case study underscores the crucial need for further evaluations of reservoir draining in other systems and contexts.

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Influence of Cougar Reservoir Drawdown on Sediment and DDT Transport and Deposition in the McKenzie River Basin, Oregon, Water Years 2002-04

Cited by 8 publications

References 12 publications

Determining Sources of Dissolved Organic Carbon and Disinfection Byproduct Precursors to the McKenzie River, Oregon

Determining Sources of Dissolved Organic Carbon and Disinfection Byproduct Precursors to the McKenzie River, Oregon

Use of Continuous Monitors and Autosamplers to Predict Unmeasured Water-Quality Constituents in Tributaries of the Tualatin River, Oregon

Short‐term reservoir draining to streambed for juvenile salmon passage and non‐native fish removal

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