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Articles 151 - 180 of 217

Full-Text Articles in Water Resource Management

Aquatic Invasive Species Surveys Of Upper Klamath Lake, Fourmile Lake, And Lake Of The Woods, Or During 2012, Rich Miller, Mark D. Sytsma Mar 2013

Aquatic Invasive Species Surveys Of Upper Klamath Lake, Fourmile Lake, And Lake Of The Woods, Or During 2012, Rich Miller, Mark D. Sytsma

Center for Lakes and Reservoirs Publications and Presentations

Three lakes located within the Klamath River Basin in Oregon (Upper Klamath Lake, Fourmile Lake, and Lake of the Woods) were surveyed for aquatic invasive species during the summer of 2012. Specimens were collected using plant rakes, benthic dredges, plankton nets, and crayfish traps. No invasive aquatic plants, gastropods, snails, bivalves or crayfish were detected in the lakes.


Osmb Ais Funds Final Report: Task 1 Boat Ramp Monitoring For New Zealand Mud Snails, Valance Brenneis, Samuel Cimino, Angela L. Strecker Jan 2013

Osmb Ais Funds Final Report: Task 1 Boat Ramp Monitoring For New Zealand Mud Snails, Valance Brenneis, Samuel Cimino, Angela L. Strecker

Center for Lakes and Reservoirs Publications and Presentations

The New Zealand mud snail (Potamopyrgus antipodarum; NZMS) is an invasive species found in a variety of ecosystems in Oregon, including brackish estuaries, heavily used recreational rivers, and highly trafficked coastal freshwater lakes. NZMS are an invasive species of concern because once established, they may out-compete native invertebrate grazers, such as native insect larvae that provide important food resources for fish, and NZMS themselves provide little nutritional value. Monitoring for the presence and population density of NZMS was performed at boat ramps located along several water bodies in 2006 – 2007. These water bodies were then re-sampled during the summer …


Pine Creek Conservation Area: 2013 Mapping And Monitoring Report, Eric M. Nielsen, Matthew D. Noone, James S. Kagan, Matthew T. Lee Jan 2013

Pine Creek Conservation Area: 2013 Mapping And Monitoring Report, Eric M. Nielsen, Matthew D. Noone, James S. Kagan, Matthew T. Lee

Institute for Natural Resources Publications

Pine Creek Conservation Area (PCCA), just northeast of the John Day River in Wheeler County, Oregon, was acquired in 1999-2001 by the Confederate Tribes of Warm Springs with support from the Bonneville Power Administration (BPA), to mitigate for wildlife losses created by the large, hydropower Columbia River Dams, particularly the Bonneville, Dalles and John Day Dams. Many thousands of acres of grassland, shrub steppe and riparian habitats were lost due to inundation, and the objectives of the acquisition included restoration of similar habitats. As part of an interagency agreement created in 2002, the Oregon Natural Heritage Information Center established a …


The Effects Of Utility Pole Placement And Characteristics On Pentachlorophenol Concentrations Entering Underground Injection Control (Uic) Devices: City Of Gresham, Oregon, Katie Bohnren Jun 2012

The Effects Of Utility Pole Placement And Characteristics On Pentachlorophenol Concentrations Entering Underground Injection Control (Uic) Devices: City Of Gresham, Oregon, Katie Bohnren

Environmental Science and Management Professional Master's Project Reports

Urbanization is causing increased amounts of stormwater runoff, while simultaneously decreasing the amount of pervious surface area for infiltration. Multiple priority pollutants have been identified in urban stormwater, including pentachlorophenol (PCP). PCP is often found in stormwater samples exceeding the Safe Drinking Water Act limit of 1μg/L and can cause human health issues with exposure over time. Treated wood utility poles are the major source of PCP in urban stormwater. With the use of underground injection control (UIC) devices as an alternative method to treat and dispose of stormwater, the potential exists for groundwater contamination of PCP. The City of …


A Performance Assessment Of Two Multi-Component Water Quality Facilities In The Columbia Slough And Fairview Creek Watersheds, Chris Robinson Apr 2012

A Performance Assessment Of Two Multi-Component Water Quality Facilities In The Columbia Slough And Fairview Creek Watersheds, Chris Robinson

Environmental Science and Management Professional Master's Project Reports

We examined the treatment trains at the Columbia Slough (CSWQF) and Fairview Creek Water Quality Facilities (FCWQF) in Gresham, OR and assessed their effectiveness at removing pollutants including nutrients, TSS, metals, pesticides, PAHs, and VOCs. Time-paced, fixed volume composite samples were collected during storm events at the inlets and outlet of the CSWQF and at the inlets and outlet of each treatment train component of the FCWQF. In addition, long-term data collected at the FCWQF was analyzed. Composite data collected during November 2-3, 2011 and March 5-6, 2012 showed that the treatment trains can measurably reduce the event mean concentration …


Northwest Forest Plan The First 15 Years (1994-2008): Watershed Condition Status And Trend, Steven H. Lanigan, Sean N. Gordon, Peter Eldred, Mark Isley, Heidi Anderson Feb 2012

Northwest Forest Plan The First 15 Years (1994-2008): Watershed Condition Status And Trend, Steven H. Lanigan, Sean N. Gordon, Peter Eldred, Mark Isley, Heidi Anderson

Institute for Sustainable Solutions Publications and Presentations

We used two data sets to evaluate stream and watershed condition for sixth-field watersheds in each aquatic province within the Northwest Forest Plan (NWFP) area: stream data and upslope data. The stream evaluation was based on inchannel data (e.g., substrate, pieces of large wood, water temperature, pool frequency, and macroinvertebrates) we sampled from 2002 to 2009 (193 watersheds) as part of a repeating sample design. We just completed our first round of sampling, so only current condition was calculated for this data set. When condition scores for the inchannel data were grouped into categories, relatively few fell into the low …


Survey Of Aquatic Invasive Species In Selected Umpqua National Forest Lakes And Ponds, Mark D. Sytsma, Rich Miller Jan 2012

Survey Of Aquatic Invasive Species In Selected Umpqua National Forest Lakes And Ponds, Mark D. Sytsma, Rich Miller

Center for Lakes and Reservoirs Publications and Presentations

Eleven lakes and ponds within the Umpqua National Forest were surveyed for invasive aquatic macrophytes, snails, bivalves, and crayfish during the summer of 2011. Yellow floating heart (Nymphoides peltata), an invasive floating leaf macrophyte species, was detected in Willow Sump within the Little River drainage. European ear snails (Radix auricularia), an invasive species present in several Umpqua National Forest waterbodies, were detected in Beaver Pond within the Steamboat Creek drainage. One native crayfish species, the signal crayfish (Pacifastacus leniusculus), was observed in Crayfish Lake within the Brice Creek drainage. Diverse assemblages of native plant species were observed in the lakes …


Groundwater Surface Trends In The North Florence Dunal Aquifer, Oregon Coast, Usa, Sarah Rebecca Doliber Jan 2012

Groundwater Surface Trends In The North Florence Dunal Aquifer, Oregon Coast, Usa, Sarah Rebecca Doliber

Dissertations and Theses

The North Florence Dunal Aquifer is the only feasible source for drinking water for the coastal city of Florence, Oregon and Florence's Urban Growth Boundary. High infiltration rates and a shallow groundwater table leave the aquifer highly susceptible to contamination from septic tank effluent, storm runoff, chemical fertilizers and recreational ATV use throughout the dunes. Public interest in the quality and quantity of the aquifer water has been sparked since the City of Florence received a grant from the Environmental Protection Agency for a watershed protection and restoration project. Delineation of the shallow groundwater surface and its relationship to the …


Climate Change Effects And Water Vulnerability In The Molalla Pudding River Basin, Oregon, Usa, Susan Amelia Wherry Jan 2012

Climate Change Effects And Water Vulnerability In The Molalla Pudding River Basin, Oregon, Usa, Susan Amelia Wherry

Dissertations and Theses

Water management plans are typically developed using historical data records and historical return periods for extreme events, such as floods or droughts. Since these analyses of return periods typically assume a certain degree of stationarity (constant mean, standard deviation, distribution) in hydrologic variables, the potential future impacts of climate change are excluded. In developing water management plans, predicted changes to climate variables should be considered to evaluate the degree of non-stationarity that may exist in the future. In this way, regions most sensitive to climate change can be identified and managed appropriately. This study performed such a task by using …


Aquatic Plant Surveys In The Bureau Of Land Management, Medford District, 2010-2011, Mark D. Sytsma, Rich Miller, Vanessa Morgan Dec 2011

Aquatic Plant Surveys In The Bureau Of Land Management, Medford District, 2010-2011, Mark D. Sytsma, Rich Miller, Vanessa Morgan

Center for Lakes and Reservoirs Publications and Presentations

The introduction of invasive aquatic plant species (IAPS) can cause significant ecological and economic harm. IAPS can displace native aquatic plant species, impair recreation, and degrade water quality. Early detection of new invasions can improve chances for successful eradication or containment to reduce the risk of IAPS spread. The Oregon Department of Agriculture (ODA) lists the most egregious offenders as “Noxious Weeds” which are defined as plants classified by the Oregon State Weed Board that are injurious to public health, agriculture, recreation, wildlife, or any public or private property (ODA 2011).

Several IAPS classified as noxious have been detected within …


Policy Analysis For Optimizing Native Fisheries On The Mckenzie River, Mary Ray May 2011

Policy Analysis For Optimizing Native Fisheries On The Mckenzie River, Mary Ray

Environmental Science and Management Professional Master's Project Reports

The impact of hatchery fish on native populations has been extensively studied, especially as environmental management has generally moved toward a conservation focus. In Oregon, the McKenzie River native rainbow trout population has been the focus of recent interest groups attempting to induce a change in management practices to support native fisheries. The McKenzie River Chapter of Trout Unlimited is interested in learning more about the impacts that hatchery stocked rainbow trout have on native river populations. It is the group's intent to seek a rule change to management by the Oregon Department of Fish and Wildlife. A review of …


Investigation And Evaluation Of Current And Emerging Whole-Water Sampling Technologies For U.S. Geological Survey National Water Quality Assessment Program, Keith D. Gareau Apr 2011

Investigation And Evaluation Of Current And Emerging Whole-Water Sampling Technologies For U.S. Geological Survey National Water Quality Assessment Program, Keith D. Gareau

Environmental Science and Management Professional Master's Project Reports

An investigation was conducted into current and emerging surface water sampling technologies. These technologies were compared and recommendations given to the United States Geological Survey (USGS) for adoption by the National Water Quality Assessment (NAWQA) Program. The goal is to reduce labor costs and increase information content. This paper examines lotic system samplers, portable autonomous whole-water samplers, and autonomous submergible whole-water samplers. When investigating whole-water sampling technology, it was imperative to take into consideration what chemical classifications can be sampled for by each respected technology. Chemical classifications considered are: emerging contaminants, major ions, nutrients, polychlorinated biphenyls, pesticides, volatile and semi-volatile …


Macroinvertebrate Community Analysis On Lower Hood River Before And During The Removal Of Powerdale Dam: A Baseline Study, Howard Jay Patterson Apr 2011

Macroinvertebrate Community Analysis On Lower Hood River Before And During The Removal Of Powerdale Dam: A Baseline Study, Howard Jay Patterson

Environmental Science and Management Professional Master's Project Reports

Powerdale Dam was an 87-year-old hydroelectric complex on lower Hood River in northern Oregon which was decommissioned in 2010. Macroinvertebrate samples were collected in 2009, before the removal process began, and in 2010, near the end of the demolition project, at one site upstream and three sites downstream of the dam. Macroinvertebrate communities were analyzed using both multi-metric (Benthic Index of Biotic Integrity [B-IBI]) and multivariate (Predictive Assessment Tool for Oregon [PREDATOR]) approaches, as well as EPT and Functional Feeding Group (FFG) analysis. All analytical approaches indicated declines in habitat quality in 2010 relative to 2009, and showed increasing impairment …


Interview With Jim Labbe, Portland Audubon Society, 2011, Jim Labbe Mar 2011

Interview With Jim Labbe, Portland Audubon Society, 2011, Jim Labbe

All Sustainability History Project Oral Histories

Interview of Jim Labbe by Tony Smith on March 11th, 2011.

The interview index is available for download.


Urban And Rural-Residential Land Uses: Their Role In Watershed Health And The Rehabilitation Of Oregon’S Wild Salmonids, Michael Harte, Victor W. Kaczynski, Clinton C. Shock, J. Alan Yeakley, Robert M. Hughes, Nancy Molina, Carl B. Schreck Dec 2010

Urban And Rural-Residential Land Uses: Their Role In Watershed Health And The Rehabilitation Of Oregon’S Wild Salmonids, Michael Harte, Victor W. Kaczynski, Clinton C. Shock, J. Alan Yeakley, Robert M. Hughes, Nancy Molina, Carl B. Schreck

Environmental Science and Management Faculty Publications and Presentations

This technical report by the Independent Multidisciplinary Science Team (IMST) is a comprehensive review of how human activities in urban and rural-residential areas can alter aquatic ecosystems and resulting implications for salmonid recovery, with a geographic focus on the state of Oregon. The following topics are considered in the form of science questions, and comprise the major components of this report:

  1. The effects of urban and rural-residential development on Oregon’s watersheds and native wild salmonids.
  2. Actions that can be used to avoid or mitigate undesirable changes to aquatic ecosystems near developing urban and rural-residential areas.
  3. The benefits and pitfalls of …


Amaila Falls Hydroelectric Project Model Development And Scenarios, Chris Berger, Scott A. Wells, Vanessa Wells Dec 2010

Amaila Falls Hydroelectric Project Model Development And Scenarios, Chris Berger, Scott A. Wells, Vanessa Wells

Civil and Environmental Engineering Faculty Publications and Presentations

The focus of this present study is to perform the following tasks:

* Develop a hydrodynamic and water quality model of the reservoir formed by the Amaila Falls Hydroelectric Project

* Develop and run modeling scenarios

Water quality model simulations of the 23.3 km2 reservoir for Amaila Falls Hydroelectric Project were conducted for low, average, and high flow years. A scenario with no vegetation removed from the reservoir for an average flow was also simulated. Conditions downstream of the reservoir were also modeled using a river model.

The model used for the reservoir formed by Amaila Falls Hydroelectric Project …


Recreational Boats As Potential Vectors Of Marine Organisms At An Invasion Hotspot, Ian C. Davidson, Chela J. Zabin, Andrew L. Chang, Christopher W. Brown, Mark Sytsma, Gregory M. Ruiz Dec 2010

Recreational Boats As Potential Vectors Of Marine Organisms At An Invasion Hotspot, Ian C. Davidson, Chela J. Zabin, Andrew L. Chang, Christopher W. Brown, Mark Sytsma, Gregory M. Ruiz

Center for Lakes and Reservoirs Publications and Presentations

With more than 200 aquatic nonindigenous species (NIS), San Francisco Bay (California, USA) is among the world’s most invaded harbors. Hard-substratum benthic (biofouling) organisms, which dominate NIS richness, have arrived primarily as a result of shipping and aquaculture activity over past centuries. To date there has been no assessment of the leisure craft vector in the Bay. We aimed to characterize (1) biofouling on boats’ submerged surfaces and (2) boater behavior likely to affect the risk of NIS transfers. We used an underwater pole-cam, specimen collections, and a boater questionnaire to quantify the extent and composition of biofouling on recreational …


Examining The Effects Of Climate Change And Urban Development On Water Demand: A Multi-Scale Analysis Of Future Water Demand In Hillsboro, Oregon, Lily Arielle House-Peters May 2010

Examining The Effects Of Climate Change And Urban Development On Water Demand: A Multi-Scale Analysis Of Future Water Demand In Hillsboro, Oregon, Lily Arielle House-Peters

Dissertations and Theses

In the Portland, Oregon, metropolitan area, suburban cities such as Hillsboro are projected to grow as people seek affordable housing near a rapidly growing metropolis. This thesis examines the combined impact of climate change and urban development on both neighborhood and municipal scale residential water demand in Hillsboro, Oregon. I use two models, a surface energy balance model, Local-scale Urban Meteorological Parameterization Scheme (LUMPS), and a system dynamics model, CCDomestic, to investigate changes in residential water demand in the 2040s at two distinct spatial scales, the neighborhood and the municipality. I calibrate and validate each model to the reference period …


The Hydro-Ecology Of Everyday Life: Assessing The Social And Environmental Determinants Of Water Use In The Portland Region, Vivek Shandas May 2010

The Hydro-Ecology Of Everyday Life: Assessing The Social And Environmental Determinants Of Water Use In The Portland Region, Vivek Shandas

Systems Science Friday Noon Seminar Series

Driven in part by the imminent threats of population growth and climate destabilization, recent studies suggest that urban areas face severe water scarcity, with some areas in Australia and the United States already instituting moratoria on water use. While water managers traditionally avoid such crises by developing demand forecasts based on population estimates, technological developments, and weather predictions, their analysis are often at a regional scale with aggregate measures of water consumption. To date, there exists limited empirical evidence about how urban spatial structure and concomitant socio-demographic and temperature characteristics mutually interact to affect water demand at the scale of …


Science And Practice Of Integrated River Basin Management : Lessons From North And Central American Unesco-Help Basins, Heejun Chang, Anne Browning-Aiken May 2010

Science And Practice Of Integrated River Basin Management : Lessons From North And Central American Unesco-Help Basins, Heejun Chang, Anne Browning-Aiken

Geography Faculty Publications and Presentations

The Hydrology for the Environment, Life and Policy (HELP) program, a cross-cutting component of the UNESCO International Hydrological Programme (IHP), has as its goal to facilitate dialogue among hydrologists, social and economic scientists, water resource managers, water lawyers, policy experts, and river basin stakeholder communities in setting a research agenda driven by local management and policy issues. HELP seeks to improve the benefits to society by applying the principals of integrated water-resources management to complex, interdisciplinary issues within catchments.

This Monograph is the culmination of a workshop held in 2010 in which the managers from the six North American basins …


Siltcoos Lake Nonpoint Source Implementation Grant: Water Quality Conditions And Nutrient Sources, Mark D. Sytsma, Rich Miller Mar 2010

Siltcoos Lake Nonpoint Source Implementation Grant: Water Quality Conditions And Nutrient Sources, Mark D. Sytsma, Rich Miller

Center for Lakes and Reservoirs Publications and Presentations

Siltcoos Lake is a large (1280 hectares), shallow (mean depth 3.3 m; maximum depth 6.7 m) lake located on the Central Oregon Coast, just south of Florence and bordered by Dunes City, Oregon. The outflow and water level of Siltcoos Lake is regulated by a dam on the Siltcoos River 4 km upstream from the Pacific. Several permanent streams feed the lake from its 176 square kilometer watershed including Fiddle Creek, Maple Creek, and Woahink Creek, the outflow from Woahink Lake. Much of the watershed is forested and used for timber harvest, residential development, and limited agricultural production.

The lake …


Integrating Education, Evaluation & Partnerships Into Large-Scale Sustainable Stormwater Management Programs, Vivek Shandas, Anne Nelson, Carine Arendes Jan 2010

Integrating Education, Evaluation & Partnerships Into Large-Scale Sustainable Stormwater Management Programs, Vivek Shandas, Anne Nelson, Carine Arendes

Urban Studies and Planning Faculty Publications and Presentations

Integrated stormwater management using green infrastructure shows promise in saving money and mitigating environmental impacts caused by urban development. Equally important are the potential community benefits, including better understanding of ecological systems, increased access to urban green spaces, safer and healthier neighborhoods, and informed residents that are equipped to take action to improve watershed health. As a partnership between the City of Portland Environmental Services, Portland State University, and residents of the Tabor to the River (T2R) neighborhood, we conducted a survey to understand the role of civic ecology in green infrastructure projects. The survey results indicate a high interest …


Hydroacoustic Survey And Point Sampling Of Macrophytes In Diamond Lake 2009, Joseph Eilers, Benn Eilers, Mark D. Sytsma, Rich Miller Jan 2010

Hydroacoustic Survey And Point Sampling Of Macrophytes In Diamond Lake 2009, Joseph Eilers, Benn Eilers, Mark D. Sytsma, Rich Miller

Center for Lakes and Reservoirs Publications and Presentations

MaxDepth Aquatics, Inc. was contracted to conduct a hydroacoustic survey of macrophyte distribution in Diamond Lake in 2009. The survey essentially repeated surveys conducted in 2002 and 2007, allowing for a detailed assessment of conditions in 2009 and comparisons among previous years. In addition, Portland State University was contracted to conduct a depth stratified random point sample survey of macrophyte species presence and absence. The point sample survey was similar to surveys conducted in 2005 and 2007. The results of the 2009 hydroacoustic survey showed that macrophytes were widely distributed throughout the lake at depths less than 8 meters, although …


Effects Of Tide Gate Replacement On Water Temperature In A Freshwater Slough In The Columbia River Estuary, Sara Ennis Oct 2009

Effects Of Tide Gate Replacement On Water Temperature In A Freshwater Slough In The Columbia River Estuary, Sara Ennis

Environmental Science and Management Professional Master's Project Reports

Dramatic declines in salmon populations in the Pacific Northwest have brought new attention to the importance of estuarine rearing habitats. Levees and tide gates used to convert estuarine wetlands into farmland have reduced available habitat by more than half of historical levels. Recent efforts to restore estuarine habitats include tide gate replacement, though this method has been poorly studied. As a key indicator of salmon habitat suitability, temperature was used to evaluate the effects of tide gate replacement in a tidally influenced freshwater slough in the Lower Columbia River estuary. Three tide gates in the largest slough on Tenasillahe Island …


Spokane River In Idaho And Washington Tmdl Water Quality And Hydrodynamic Modeling Quality Assurance Project Plan -- Draft, Scott A. Wells, Chris Berger Feb 2009

Spokane River In Idaho And Washington Tmdl Water Quality And Hydrodynamic Modeling Quality Assurance Project Plan -- Draft, Scott A. Wells, Chris Berger

Civil and Environmental Engineering Faculty Publications and Presentations

The focus of this present study is to perform the following tasks:

• Converting the Upper Spokane River CE‐QUAL‐W2 models (Washington and Idaho) to version 3.6

• Combining the Washington and Idaho models

• Reviewing and updating model boundary conditions

• Check model calibration

• Meet with stakeholders

• Develop and Run Modeling Scenarios

• Create reports on calibration and scenario runs


State Of The River Report For Toxics, Bradley Carter Jan 2009

State Of The River Report For Toxics, Bradley Carter

Environmental Science and Management Professional Master's Project Reports

The United States Environmental Protection Agency (EPA) strives to prevent pollution, protect water quality and improve ecosystems in order to reduce risks to human health and the environment. As outlined in the Agency’s Strategic Plan, the Columbia River Basin was identified as a "National Priority" and designated as one of our nation’s seven "Large Aquatic Ecosystems". This designation grants legislative status equal to the Chesapeake Bay, Great Lakes, Gulf of Mexico, South Florida Ecosystem, Long Island Sound and Puget Sound. The Strategic Plan is the Agency’s road map of future work efforts, and targets specific goals that are expected to …


Downspout Disconnection Suitability And Incentives Analysis For The City Of Gresham, Oregon, Brian C. Fletcher Jan 2009

Downspout Disconnection Suitability And Incentives Analysis For The City Of Gresham, Oregon, Brian C. Fletcher

Environmental Science and Management Professional Master's Project Reports

The City of Gresham is developing a Downspout Disconnection Program, which encourages homeowners to disconnect their roof downspouts from the storm sewer system and divert the stormwater onto their lawn or rain garden. Downspout disconnection is being evaluated for its effectiveness to help the city meet stormwater discharge requirements in their NPDES-MS4 permit from Oregon DEQ. This study reviewed current Natural Resources Conservation Service (NRCS) soil data and developed a suitability map showing High, Medium and Low suitability zones for on-site stormwater management. To validate the map, 55 soil textural classes and 11 infiltration rates were determined at residences throughout …


Green Crab Control: A Removal Effort In A Shallow Central California Estuary, Amy A. Larson, C. E. De Rivera, G. M. Ruiz, E. D. Grosholz, Mark D. Sytsma Mar 2008

Green Crab Control: A Removal Effort In A Shallow Central California Estuary, Amy A. Larson, C. E. De Rivera, G. M. Ruiz, E. D. Grosholz, Mark D. Sytsma

Environmental Science and Management Faculty Publications and Presentations

Goal: To test the feasibility and effects of locally removing a well-established population of a marine organism with pelagic larvae. Removal of adult European green crabs (Carcinus maenas) from Bodega Harbor as a model system to develop and inform management options for eradication, rapid response, and control of marine invaders.


Pend Oreille River Model: Model Scenario Simulations, Robert Leslie Annear, Chris Berger, Scott A. Wells Oct 2007

Pend Oreille River Model: Model Scenario Simulations, Robert Leslie Annear, Chris Berger, Scott A. Wells

Civil and Environmental Engineering Faculty Publications and Presentations

The Idaho Department of Environmental Quality is interested in developing a temperature and water quality Total Maximum Daily Load (TMDL) allocation for the Pend Oreille River between the Long Bridge near the historical Lake Pend Oreille outlet and Albeni Falls Dam (U.S. Army Corps of Engineer’s reservoir) as shown in Figure 1.

This management scenario report is an update of a prior report. The management scenarios had to be rerun because of a modeling error made with the outflows rate of Albeni Falls Dam. The new calibration error statistics were compared with the old statistics in Appendix B: Model Calibration …


The Effects Of Coypu Myocaster Coypus (Nutria) Trapping On The Water Quality Of South Johnson Creek, Beaverton, Oregon, Deborah Jean Frankel May 2007

The Effects Of Coypu Myocaster Coypus (Nutria) Trapping On The Water Quality Of South Johnson Creek, Beaverton, Oregon, Deborah Jean Frankel

Dissertations and Theses

Nutria are semi-aquatic rodents, non-native to Oregon. They are an invasive species that damage stream banks with burrowing and cause destruction of native vegetation; activity that may cause deterioration of stream water quality. I hypothesized that my study's duration and pattern of nutria trapping along South Johnson Creek would be sufficient to lead to a significant change in turbidity, dissolved oxygen (DO), total dissolved solids (TDS), total solids (TS), and total suspended solids (TSS).