Download or read book Phosphorus and E Coli in the Fanno and Bronson Creek Subbasins of the Tualatin River Basin Oregon During Summer Low flow Conditions 1996 written by Kathleen A. McCarthy and published by . This book was released on 2000 with total page 44 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Phosphorus and E Coli in the Fanno and Bronson Creek Subbasins of the Tualatin River Basin Oregon During Summer Low flow Conditions 1996 written by Kathleen A. McCarthy and published by . This book was released on 2000 with total page 31 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Phosphorus and E Coli and Their Relation to Selected Constituents During Storm Runoff Conditions in Fanno Creek Oregon 1998 99 written by Chauncey W. Anderson and published by . This book was released on 2003 with total page 46 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Water resources Investigations Report written by and published by . This book was released on 2002 with total page 314 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Water resources Investigations Report written by Charles E. Heywood and published by . This book was released on 2002 with total page 190 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Sources and Transport of Phosphorus and Nitrogen During Low flow Conditions in the Tualatin River Oregon 1991 93 written by Valerie J. Kelly and published by Geological Survey (USGS). This book was released on 1999 with total page 112 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Water resources Investigations Report written by and published by . This book was released on 2000 with total page 216 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book New Publications of the Geological Survey written by Geological Survey (U.S.) and published by . This book was released on 2001 with total page 178 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book New Publications of the U S Geological Survey written by and published by . This book was released on 2000 with total page 646 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Sediment Transport in Gravel Bed Rivers written by C. R. Thorne and published by . This book was released on 1987-09-28 with total page 1038 pages. Available in PDF, EPUB and Kindle. Book excerpt: Describes and quantifies the movement and storage of sediment in rivers with gravel-bed material, based upon scientific and engineering principles. Papers based on theory and experiment are interspersed with case studies. Until recently, gravel-bed rivers have been under-researched, when compared with sand-bed rivers. There is a heightened interest in these rivers now, due to pressure from water resources, forestry and recreational development in upland areas.

Download or read book Sources and Transport of Phosphorus and Nitrogen During Low flow Conditions in the Tualatin River Oregon 1991 93 written by Valerie J. Kelly and published by . This book was released on 1999 with total page 94 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book SOURCES AND TRANSPORT OF PHOSPHORUS AND NITROGREN DURING LOW FLOW CONDITIONS IN THE TUALATIN RIVER OREGON 1991 93 KELLY VALERIE ET AL written by Geological Survey (U.S.) and published by . This book was released on 2002* with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book The Spatial and Temporal Variability of Phosphorus in Relation to Urbanization in the Bronson Creek Watershed Tualatin Oregon written by Erin Kathleen Mick and published by . This book was released on 2003 with total page 194 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Bibliography of Agriculture with Subject Index written by and published by . This book was released on 2000 with total page 536 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Land Use and Nonpoint Source Phosphorus Pollution in the Dairy McKay Hydrologic Unit Area of the Tualatin River Basin Oregon written by Donald W. Wolf and published by . This book was released on 1993 with total page 166 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book The Short Term Termporal and Spatial Variability of Nitrogen and Phosphorus in Two Oregon Coast Range Streams written by Robert A. Scherer and published by . This book was released on 1995 with total page 254 pages. Available in PDF, EPUB and Kindle. Book excerpt: High intensity sampling was undertaken to characterize the temporal and spatial variability of oxidized nitrogen (NO3-N + NO2-N), ammonia-nitrogen (NH3-N), total dissolved phosphorus, total unfiltered phosphorus and orthophosphorus (PO4-P) from two adjacent small streams in Western Oregon's Coast Range, Deer Creek (303 ha) and Flynn Creek (203 ha). Deer Creek has been 39 % clearcut from 1966 to 1987 while, Flynn Creek has never been logged and remains a "control" watershed for various research projects. A sequential wet-deposition precipitation sampler was also used to determine the temporal variability of oxidized-nitrogen, ammonia-nitrogen, total dissolved phosphorus and orthophosphorus entering a watershed during two storm events. Samples collected every one hour over a 25 to 26-h period during summer low flows indicated that oxidized nitrogen, ammonia-nitrogen, total unfiltered phosphorus, and orthophosphorus remained relatively constant. Total dissolved phosphorus concentrations were the most variable but did not have a discernible diel pattern. On a spatial scale, total unfiltered phosphorus and total dissolved phosphorus remained relatively constant or showed no discernable patterns when sampled over five 250-m intervals on each creek during summer low flow. Oxidized nitrogen and orthophosphorus concentrations increased on Deer Creek and decreased on Flynn Creek in an downstream direction. Ammonia-nitrogen concentrations decreased in a downstream direction on Deer Creek and remained constant on Flynn Creek. Nutrient constituent concentrations observed during high intensity sampling of three storm events had a variable response with stream discharge. Oxidized nitrogen concentration levels collected during the first fall storm appeared to be consistent with other research that has shown a flush of oxidized nitrogen out of the forest soil profile during the first fall storm. Sample concentrations from the first sampled storm had a 36 % decrease in concentration with the falling limb of the first sampled storm on both Deer Creek and Flynn Creek. Whereas, oxidized nitrogen concentrations had a 9 to 25 % decrease with an increase in discharge on the two studied creeks and returned to pre-storm levels with a decrease in discharge during two winter storms. Total unfiltered phosphorus concentrations had a 90 to 1150 % (0 to 10 fold) increase with a rise in storm discharge and decreased with the fall in storm discharge depending on the storm event and creek sampled. Ammonia-nitrogen, total dissolved phosphorus and orthophosphorus concentrations were not related to changes in discharge. Precipitation concentrations of oxidized nitrogen and ammonia-nitrogen either had a variable response or became diluted with an increase in rainfall amounts. The different responses appear to be related to storm intensity, with greater dilution in higher intensity storms. Results from this study indicate that the input and output of nitrogen and phosphorus into forested streams can be quite variable on both small temporal and spatial scales depending on the particular nutrient sampled, the particular creek sampled, stream flow conditions and season. It appears that sampling schemes designed for monitoring water chemistry or nutrient flux should initially presume significant short interval (2 to 20-h) variation until intensive sampling is able to prove otherwise.