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• 1. [Article] What Will Oregon’s Future Streamflow Regimes Look Like? Integrating Snowpack and Groundwater Dynamics

  Presented at The Oregon Water Conference, May 24-25, 2011, Corvallis, OR.

  Citation × Citation Citation Abstract Copy Title: What Will Oregon’s Future Streamflow Regimes Look Like? Integrating Snowpack and Groundwater Dynamics Author: Lewis, Sarah, Safeeq, Mohammad, Tague, Christina, Grant, Gordon E. Year: 2011 Presented at The Oregon Water Conference, May 24-25, 2011, Corvallis, OR. Title: What Will Oregon’s Future Streamflow Regimes Look Like? Integrating Snowpack and Groundwater Dynamics Author: Lewis, Sarah, Safeeq, Mohammad, Tague, Christina, Grant, Gordon E. Year: 2011 Presented at The Oregon Water Conference, May 24-25, 2011, Corvallis, OR. Close

• 2. [Article] Physiological impacts of groundwater and surface water application on desert graminoids of different geographic origin

  Desert plant communities are among the most sensitive to changes in soil water conditions. In areas with shallow aquifers, it is important to understand both the effects of groundwater alterations on ...

  Citation × Citation Citation Abstract Copy Title: Physiological impacts of groundwater and surface water application on desert graminoids of different geographic origin Author: Abdallah, Mohamed (Mohamed Ahmed B.) Desert plant communities are among the most sensitive to changes in soil water conditions. In areas with shallow aquifers, it is important to understand both the effects of groundwater alterations on vegetation and how changes in surface-soil water affect plant water uptake. Studies in arid environments have evaluated the effect of groundwater variation and simulated precipitation on plant production and vegetation condition but it is not clear if plants respond equally to the availability of surface water or groundwater. This study was conducted in a greenhouse to evaluate growth and physiology of three desert graminoids (Distichlis spicata, Leymus triticoides, and Juncus arcticus) as affected by surface water availability (mimicking precipitation) or subsurface water availability (mimicking groundwater). The species of study are amply distributed in wetlands and open rangelands of western USA and were collected from two sources of ecological distribution: an area near Bishop, California, and an area near Burns, Oregon. The Bishop, California area has a characteristic shallow aquifer and plants in this area are considered somewhat dependent on groundwater. The Burns, Oregon, area sustains the same species but in a variety of soil moisture conditions. We had two general hypotheses for this study: 1) that the use of surface water is favored over groundwater and 2) that there are ecotypic differences in the response of the species to water availability. The first hypothesis was partially supported by the results of the study, but variability existed among species. However, when all species had equal access to both surface soil water and groundwater plants tended to preferentially use surface water. The second hypothesis was clearly supported by our results. Although the mechanism is not clear, it is possible that an area with periodic and predictable shallow groundwater underlying a dry or saline soil layer, such as the California site, might favor plant ecotypes with high proficiency in water acquisition by deeper roots. Knowledge of water use characteristics of vegetation is essential to provide management guidelines for areas where plants depend on both surface-soil water and groundwater. This study contributed to that knowledge. Further studies on ecotypic variation and an expansion to different species that inhabit areas with shallow aquifers are recommended. Title: Physiological impacts of groundwater and surface water application on desert graminoids of different geographic origin Author: Abdallah, Mohamed (Mohamed Ahmed B.) Desert plant communities are among the most sensitive to changes in soil water conditions. In areas with shallow aquifers, it is important to understand both the effects of groundwater alterations on vegetation and how changes in surface-soil water affect plant water uptake. Studies in arid environments have evaluated the effect of groundwater variation and simulated precipitation on plant production and vegetation condition but it is not clear if plants respond equally to the availability of surface water or groundwater. This study was conducted in a greenhouse to evaluate growth and physiology of three desert graminoids (Distichlis spicata, Leymus triticoides, and Juncus arcticus) as affected by surface water availability (mimicking precipitation) or subsurface water availability (mimicking groundwater). The species of study are amply distributed in wetlands and open rangelands of western USA and were collected from two sources of ecological distribution: an area near Bishop, California, and an area near Burns, Oregon. The Bishop, California area has a characteristic shallow aquifer and plants in this area are considered somewhat dependent on groundwater. The Burns, Oregon, area sustains the same species but in a variety of soil moisture conditions. We had two general hypotheses for this study: 1) that the use of surface water is favored over groundwater and 2) that there are ecotypic differences in the response of the species to water availability. The first hypothesis was partially supported by the results of the study, but variability existed among species. However, when all species had equal access to both surface soil water and groundwater plants tended to preferentially use surface water. The second hypothesis was clearly supported by our results. Although the mechanism is not clear, it is possible that an area with periodic and predictable shallow groundwater underlying a dry or saline soil layer, such as the California site, might favor plant ecotypes with high proficiency in water acquisition by deeper roots. Knowledge of water use characteristics of vegetation is essential to provide management guidelines for areas where plants depend on both surface-soil water and groundwater. This study contributed to that knowledge. Further studies on ecotypic variation and an expansion to different species that inhabit areas with shallow aquifers are recommended. Close

• 3. [Article] The interactive effects of excess reactive nitrogen and climate change on aquatic ecosystems and water resources of the United States

  To the best of our knowledge, one or more authors of this paper were federal employees when contributing to this work. This is the publisher’s final pdf. The published article is copyrighted by Springer ...

  Citation × Citation Citation Abstract Copy Title: The interactive effects of excess reactive nitrogen and climate change on aquatic ecosystems and water resources of the United States Author: Baron, J. S., Hall, E. K., Harrison, J. A., Bernhardt, E. S., Nolan, B. T., Finlay, J. C., Chan, F., Boyer, E. W. To the best of our knowledge, one or more authors of this paper were federal employees when contributing to this work. This is the publisher’s final pdf. The published article is copyrighted by Springer and can be found at: http://www.springer.com/?SGWID=0-102-0-0-0. Title: The interactive effects of excess reactive nitrogen and climate change on aquatic ecosystems and water resources of the United States Author: Baron, J. S., Hall, E. K., Harrison, J. A., Bernhardt, E. S., Nolan, B. T., Finlay, J. C., Chan, F., Boyer, E. W. To the best of our knowledge, one or more authors of this paper were federal employees when contributing to this work. This is the publisher’s final pdf. The published article is copyrighted by Springer and can be found at: http://www.springer.com/?SGWID=0-102-0-0-0. Close

• 4. [Article] A Collaborative Effort to Evaluate Water Resources in the Lower Siuslaw Watershed

  Presented at The Oregon Water Conference, May 24-25, 2011, Corvallis, OR.

  Citation × Citation Citation Abstract Copy Title: A Collaborative Effort to Evaluate Water Resources in the Lower Siuslaw Watershed Author: Livesay, Dave, Miller, Mike, Nelson, Dennis, Moellendorf, Suzanne Year: 2011 Presented at The Oregon Water Conference, May 24-25, 2011, Corvallis, OR. Title: A Collaborative Effort to Evaluate Water Resources in the Lower Siuslaw Watershed Author: Livesay, Dave, Miller, Mike, Nelson, Dennis, Moellendorf, Suzanne Year: 2011 Presented at The Oregon Water Conference, May 24-25, 2011, Corvallis, OR. Close

• 5. [Article] An Investigation into What Planning Departments and Water Authorities Can Learn from Eleven Communities' Waterwise Landscaping Ordinances

  In the United States we are using billions of gallons more water every day than is replenished by the hydrological cycle. Because water applied to landscaping is often the single largest use of the water ...

  Citation × Citation Citation Abstract Copy Title: An Investigation into What Planning Departments and Water Authorities Can Learn from Eleven Communities' Waterwise Landscaping Ordinances Author: Anderson, Kristin M. Year: 2004 In the United States we are using billions of gallons more water every day than is replenished by the hydrological cycle. Because water applied to landscaping is often the single largest use of the water supplied by most water utilities in areas requiring landscape irrigation, planners and water authorities are adopting ordinances that reduce the amount of water required by landscaping. This report focuses on ordinances which require or encourage the use of waterwise plants and/or that limit the area of lawns or offer incentives for reducing lawn area. I analyzed eleven ordinances from eight states (Arizona, California, Nevada, New Mexico, North Carolina, Oregon, Texas, and Washington) and interviewed twelve planners and eight landscape architects from ten of these communities. This report provides information on the many options available in waterwise landscaping ordinances, how various ordinance elements are enforced in real life, the advantages and disadvantages of various elements, and landscape architects’ and planners’ views and recommendations. In addition to my analysis and recommendations, the report includes a literature review that is a primer on water shortage issues, the relationship between landscapes and water consumption, and the theory of waterwise landscaping ordinances; a matrix comparing the eleven ordinances and community factors (such as evapotranspiration and cost of water); and a compendium of 25 waterwise landscaping ordinance elements. Title: An Investigation into What Planning Departments and Water Authorities Can Learn from Eleven Communities' Waterwise Landscaping Ordinances Author: Anderson, Kristin M. Year: 2004 In the United States we are using billions of gallons more water every day than is replenished by the hydrological cycle. Because water applied to landscaping is often the single largest use of the water supplied by most water utilities in areas requiring landscape irrigation, planners and water authorities are adopting ordinances that reduce the amount of water required by landscaping. This report focuses on ordinances which require or encourage the use of waterwise plants and/or that limit the area of lawns or offer incentives for reducing lawn area. I analyzed eleven ordinances from eight states (Arizona, California, Nevada, New Mexico, North Carolina, Oregon, Texas, and Washington) and interviewed twelve planners and eight landscape architects from ten of these communities. This report provides information on the many options available in waterwise landscaping ordinances, how various ordinance elements are enforced in real life, the advantages and disadvantages of various elements, and landscape architects’ and planners’ views and recommendations. In addition to my analysis and recommendations, the report includes a literature review that is a primer on water shortage issues, the relationship between landscapes and water consumption, and the theory of waterwise landscaping ordinances; a matrix comparing the eleven ordinances and community factors (such as evapotranspiration and cost of water); and a compendium of 25 waterwise landscaping ordinance elements. Close