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EBookClubs

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Book Final Report

Download or read book Final Report written by Douglas Lynn Overdorff and published by . This book was released on 1981 with total page 131 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Book Johnson Creek Watershed Total Maximum Daily Load

Download or read book Johnson Creek Watershed Total Maximum Daily Load written by Steven Richard Butkus and published by . This book was released on 2000 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:

Book Johnson Creek Watershed Total Maximum Daily Load

Download or read book Johnson Creek Watershed Total Maximum Daily Load written by Steven Richard Butkus and published by . This book was released on 2000 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:

Book Water Quality in the Johnson Creek Watershed After the Implementation of Best Management Practices

Download or read book Water Quality in the Johnson Creek Watershed After the Implementation of Best Management Practices written by Betsy Dickes and published by . This book was released on 1990 with total page 43 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Book Valuation of Urban Stream Restoration in the Johnson Creek Watershed

Download or read book Valuation of Urban Stream Restoration in the Johnson Creek Watershed written by Maya Jarrad and published by . This book was released on 2014 with total page 76 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Book Johnson Creek

Download or read book Johnson Creek written by Susan Vetter and published by . This book was released on 1998 with total page 105 pages. Available in PDF, EPUB and Kindle. Book excerpt: Project resulting from the Senior capstone class offered 1998 spring quarter. Nine student essays present an historical overview, from prehistoric Native American occupation through the twentieth-century, on the 54-square-mile Johnson Creek Watershed (Portland, Or.), and examine the environmental effects of urban growth and industrial development in the area, including impacts on agriculture, water quality, and flooding.

Book Johnson Creek Watershed Erosion Assessment C I P No 485 617 2000

Download or read book Johnson Creek Watershed Erosion Assessment C I P No 485 617 2000 written by Thomas E. Hegemeir and published by . This book was released on 1997 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:

Book Johnson Creek Vision

Download or read book Johnson Creek Vision written by Woodward-Clyde Consultants and published by . This book was released on 1992 with total page 33 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Book Modeling Effective Shade to Prioritize Riparian Restoration Efforts in the Johnson Creek Watershed OR

Download or read book Modeling Effective Shade to Prioritize Riparian Restoration Efforts in the Johnson Creek Watershed OR written by and published by . This book was released on 2014 with total page 95 pages. Available in PDF, EPUB and Kindle. Book excerpt: The influence of stream temperature on the survival and reproductive success of anadromous salmonid populations has become an increasingly concerning issue in the Pacific Northwest. Enhancing the height, density and extent of riparian vegetation is widely accepted as one of the most effective strategies for reducing stream temperatures, while also providing numerous ancillary benefits. Effective shade is defined as the percentage of direct beam solar radiation attenuated and scattered by riparian vegetation before reaching the stream surface and is a commonly used criterion for choosing where to restore riparian vegetation. This project aims to prioritize sites for riparian restoration through effective shade modeling within the geographic extent of the Johnson Creek watershed. Modeling inputs included a limited set of channel morphology and riparian vegetation attributes and were sampled from high spatial resolution LiDAR derived raster datasets (3 ft.) using Python script programming tools. A separate raster was created to depict restored conditions, in which the height of all restorable riparian vegetation is set equal to 27 meters. Using the stream temperature model, Heat Source, effective shade simulations were performed along the mainstem Johnson Creek and all tributary streams over the duration of a single day in August. Model outputs provided effective shade and daily solar flux attenuation estimates under current and restored conditions, the difference of which represented the net benefit, in terms of shade, that would result from restoration. Model outputs were used to evaluate the current level of effective shade in the watershed and to prioritize restoration efforts at the taxlot, subwatershed and jurisdictional scale. Currently, effective shade is 73% on average for all streams in watershed. Under a restoration scenario, 544.9 acres would be restored resulting in the additional solar flux reduction of 209,118.9 watts/m2/d. Restoring only 22% of all taxlots or 21% of all restorable acres would accomplish 50% of the cumulative solar flux reduction. Restoring 38% of all taxlots or 55% of all restorable acres would accomplish 90% of the cumulative solar flux reduction. Prioritizing at the taxlot scale, as opposed to subwatersheds or jurisdictions, promotes a higher level of efficiency in the prioritization of restoration efforts. All taxlots should be further screened prior to final prioritization for opportunistic prospects such as landowner willingness, community support or proximity to existing restoration projects, and fundraising opportunities.

Book River and Watershed Conservation Directory

Download or read book River and Watershed Conservation Directory written by and published by . This book was released on 1998 with total page 524 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Book Johnson Creek Bacteria TMDL Implementation

Download or read book Johnson Creek Bacteria TMDL Implementation written by and published by . This book was released on 2017 with total page 196 pages. Available in PDF, EPUB and Kindle. Book excerpt: Like many other waterbodies in the United States, Johnson Creek, a tributary of the Lower Willamette River is water quality limited for bacteria. Escherichia coli (E. coli), a member of the fecal coliform bacteria group, has been found to have a high association with human pathogens and the occurrences of gastrointestinal illnesses in waters used for contact recreation; E. coli is commonly used as an indicator of fecal contamination. In the State of Oregon water contact recreational standards for fecal exposure is assessed by measuring in stream levels of E. coli. Because Johnson Creek is water quality limited for bacteria the Oregon Department of Environmental Quality (ODEQ) developed a Total Maximum Daily Load (TMDL) document to address the re-attainment of water quality standards. ODEQ designated management agencies (DMAs) within the Johnson Creek Watershed to adopt best management practices (BMPs) to meet required bacterial loading conditions called for by the TMDL. In this study the status and trends of E. coli over the last two decades were assessed (1996-2016) by analyzing loading conditions for different flow regimes before and after implementation of the TMDL. In addition, management actions utilized by DMAs within the watershed were observed, the effectiveness of structural BMPs were assessed, and recommendations were made to better evaluate progress towards meeting the TMDL. Four sampling sites were selected in this study to evaluate bacterial water quality within the watershed. The study sites spanned from the upper watershed near where Johnson Creek enters the City of Gresham to the mouth of the watershed in the City of Milwaukie. Two of the four study sites, located in subwatersheds dominated by urban development, showed progress towards meeting water quality standards, while the other two sites, which were in subwatersheds where rural and agricultural land use predominated, did not show progress. The strength of the conclusions in this study were hampered by inconsistent temporal spacing and sparse data which rendered trend and loading analyses largely un-interpretable.