Download or read book Simulation of Storm Runoff in the Oregon Coast Range written by Mark A. Fedora and published by . This book was released on 1987 with total page 111 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Use of a Precipitation runoff Model for Simulating Effects of Forest Management on Streamflow in 11 Small Drainage Basins Oregon Coast Range written by John C. Risley and published by . This book was released on 1994 with total page 78 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Use of a Precipitation runoff Model for Simulating Effects of Forest Management on Streamflow in 11 Small Drainage Basins Oregon Coast Range written by John C. Risley and published by . This book was released on 1994 with total page 74 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Storm Runoff Response from Roadbuilding and Logging on Small Watersheds in the Oregon Coast Range written by Frederic Shu-kong Hsieh and published by . This book was released on 1970 with total page 298 pages. Available in PDF, EPUB and Kindle. Book excerpt: The effects of roadbuilding, logging and burning upon stream runoff responses to individual storms are evaluated for the Alsea experimental watersheds, located in the Oregon Coast Range, The parameters analyzed are peak discharge, induced peak discharge, time-to-peak, and storm-runoff volume. The volume parameter is further sub-divided into total, quick, delayed, rising limb and falling limb flows. The control-watershed approach and linear regression method are utilized in this study. Calibration of the main stations at Flynn Creek (502 acres) and Deer Creek (750 acres) started in 1958. That for subwatershed DC II (138 acres) and DC III (100 acres) started in 1962. Watershed treatments included differing amounts of roadbuilding in the summer of 1965 and logging in 1966. The percentages of each watershed area subject to roadbuilding and to logging, respectively, were: Deer Creek main station, 3.7% and 26% of area in roads and logging, respectively, DC II, 3.1% and 20%, and DC III, 12, 1% and 72%, One small portion on the main watershed also received burning treatment in 1967, Flynn Creek was preserved in its natural state as a control. Data were analyzed through 1968. The storm-runoff responses of the treated watershed were found to relate to the type of treatment applied and percent of area treated, Roadbuilding resulted in significant increases in peak and induced peak discharges on DC III, which was subjected to the most intensive treatment. Logging generally demonstrated a more pronounced effect on runoff than did roadbuilding, since more vegetation was removed. Although highly significant augmentations in peak and induced peak discharges were detected after logging on subwatershed III, only minor changes were observed at the main Deer Creek outlet, The time-to-peak parameter was generally not affected by the land manipulations in this study. Separation of the annual data into the assumed recharging and recharged periods, based on antecedent soil moisture conditions, was selected for seasonal comparison over the use of an arbitrary cutoff date. Changes in flow volume parameters due to roadbuilding were insignificant. Rising limb flow on DC III as well as at the Deer Creek main station was moderately increased after logging. Although an increase in delayed flow and a decrease in quick flow occurred at the main station, these are considered to be compensating errors. Effects on design floods after treatments were indicated by the sharp increases in peak discharges, based upon flood frequency and statistical analyses.

Download or read book Hydrology of Five Forest Roads in the Oregon Coast Range written by Christine Erica Marbet and published by . This book was released on 2003 with total page 188 pages. Available in PDF, EPUB and Kindle. Book excerpt: Understanding the impact of low volume road networks on forested watersheds is important for future forest management and watershed restoration. This study characterized the hydrology of five segments of forest road in the Oregon Coast Range. Rainfall, infiltration, road surface runoff, and intercepted subsurface flow were measured at each road segment. Results indicate that these individual segments of forest road differ hydrologically, depending on how much subsurface flow they intercept from the hillslope. The first objective of this study was to compare and contrast hydrologic behavior of ditch flow resulting from infiltration-excess overland flow on the road surface with ditch flow that was intercepted subsurface flow from the hillslope. Overland flow and intercepted subsurface flow were physically separated in the ditch by a divider and routed through two trapezoidal flumes at the bottom of each road study segment. Runoff derived from infiltration-excess overland flow on the road surface was ephemeral, responding to high intensity rainfall, and it ceased within minutes to hours after rainfall. This was the only type of flow observed in road ditches at four of the five study sites. Subsurface flow intercepted from the hillslope was intermittent, occurring continuously during the rainy season with a more gradual, muted response to storms. This type of flow occurred, along with ephemeral ditch flow, at one of the five study sites. Ephemeral flow in the ditch of this site produced minimal runoff volume, no more than 4.5 m3 (16 mm / m2 of road), for storms up to 140 mm in depth. In contrast, intermittent ditch flow intercepted from the hillslope produced up to 801 m3 (2800 mm / m2 of road) for similar storms, 20 times more flow than all of the rainfall that had occurred on the road surface. Any ephemeral ditch flow derived from subsurface flow on the hillslope was not observed in this study, though it may exist. The second objective of this thesis was to quantify the relationship between rainfall intensity, infiltration capacity and road surface runoff at the study road segments. A rainfall simulator was used to measure road infiltration capacities. Estimates of infiltration capacity from the rainfall simulation averaged 4 mm/hr and ranged from 0 to 11 mm/hr. Despite the low infiltration capacities, runoff volumes from the road surface were on average only 5 percent of natural rainfall, because rainfall intensity remained lower than infiltration capacity during most of the duration of storms. Infrequent pulses of high intensity rainfall overwhelmed the infiltration capacity of the road and produced surface runoff. Median lag time from peak rainfall intensity to peak discharge of road-derived ditch flow was 10 minutes on road segments with up to 250 m2 of surface area. Two other estimates of the infiltration capacity of a given road were 1) the maximum rainfall intensity that did not produce runoff, and 2) the minimum rainfall intensity that did produce runoff. These intensities ranged from 0.5 to 11 mm/hr, similar to the infiltration capacity estimates from rainfall simulation. Infiltration capacity and ephemeral road surface runoff were similar for all road segments in this study. Intermittent flow, intercepted from the hillslope, differed between roads and was two orders of magnitude greater than ephemeral runoff from the road surface. Intercepted subsurface flow has greater potential to cause erosive damage than ephemeral runoff from the road surface, because of its large peak discharges and flow volumes.

Download or read book Use of a Rainfall runoff Model for Simulating Effects of Forest Management on Streamflow in the East Fork Lobster Creek Basin Oregon written by Lenore Y. Nakama and published by . This book was released on 1993 with total page 56 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Compendium of Current Coast Range Research written by and published by . This book was released on 1989 with total page 136 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book COPE Report written by and published by . This book was released on 1988 with total page 322 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Bibliography of Forest Water Yields Flooding Issues and the Hydrologic Modeling of Extreme Flood Events written by and published by . This book was released on 2007 with total page 44 pages. Available in PDF, EPUB and Kindle. Book excerpt: Floods continue to cause significant damage in the United States and elsewhere, and questions about the causes of flooding continue to be debated. A significant amount of research has been conducted on the relationship between forest management activities and water yield, peak flows, and flooding; somewhat less research has been conducted on the modeling of these activities as related to flooding. This bibliography and online bibliographic database provide a searchable listing of more than 600 publications related to the interrelationships of forest and forest management on watershed and flood hydrology. Also included are publications related to the capability and limitations of currently available hydrologic models and modeling approaches, with particular emphasis on their utility for evaluating forest management effects.

Download or read book Monthly Catalog of United States Government Publications written by and published by . This book was released on 1989 with total page 600 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Hydrogeology and Simulation of Ground water Flow Near the Lantana Landfill Palm Beach County Florida written by Gary M. Russell and published by . This book was released on 1993 with total page 384 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Selected Water Resources Abstracts written by and published by . This book was released on 1991 with total page 804 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Masters Theses in the Pure and Applied Sciences written by Wade H. Shafer and published by Springer Science & Business Media. This book was released on 2012-12-06 with total page 430 pages. Available in PDF, EPUB and Kindle. Book excerpt: Masters Theses in the Pure and Applied Sciences was first conceived, published, and disseminated by the Center for Information and Numerical Oata Analysis and Synthesis (CINOAS) * at Purdue. University in 1957, starting its coverage of theses with the academic year 1955. Beginning with Volume 13, the printing and dissemination phases of the activity were transferred to University Microfilms/Xerox of Ann Arbor, Michigan, with the thought that such an arrangement would be more beneficial to the academic and general scientific and technical community. After five years of this joint undertaking we had concluded that it was in the interest of all con cerned if the printing and distribution of the volumes were handled by an interna tional publishing house to assure improved service and broader dissemination. Hence, starting with Volume 18, Masters Theses in the Pure and Applied Sciences has been disseminated on a worldwide basis by Plenum Publishing Cor poration of New York, and in the same year the coverage was broadened to include Canadian universities. All back issues can also be ordered from Plenum. We have reported in Volume 33 (thesis year 1988) a total of 13,273 theses titles from 23 Canadian and 1 85 United States universities. We are sure that this broader base for these titles reported will greatly enhance the value of this important annual reference work. While Volume 33 reports theses submitted in 1988, on occasion, certain univer sities do report theses submitted in previous years but not reported at the time.

Download or read book Water resources Investigations Report written by and published by . This book was released on 2001 with total page 60 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Monthly Catalogue United States Public Documents written by and published by . This book was released on 1995 with total page 1732 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Preliminary Results of the Simulation of Oregon Coastal Basins Using Precipitation Runoff Modeling System PRMS written by Roderick L. Allen and published by . This book was released on 1993 with total page 99 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Simulated Storm Runoff Characteristics Between Natural and Altered Ecosystems in the Oregon Range Validation Area written by Domenic Affrunti Bolognani and published by . This book was released on 1981 with total page 116 pages. Available in PDF, EPUB and Kindle. Book excerpt: During the summer of 1980 an infiltration/sedimentation study was conducted on the Oregon Range and Related Resource Validation Project Work Area in the Blue Mountains of east-central Oregon. A modified Rocky Mountain infiltrometer was used to simulate a 28 minute high intensity rainfall event to determine mean infiltration rates and average potential sediment losses on 19 improved resource units consisting of various combinations of productivity and condition classes. Such improvements included seedings, thinnings, herbicide spraying, mechanical brush control and certain combinations of 2 or more practices. Natural or unimproved resource units of similar soil type and ecological expression were sampled and used as controls. On 4 of 9 seeded mountain grassland ecosystems sampled, the control had significantly higher infiltration rates for the entire run. On 2 others, no significant difference in infiltration rates occurred during the 3 -8 time interval. Thereafter, the control had significantly higher infiltration rates. In another instance, the control had significantly higher infiltration rates only for the 3-8 minute time interval after which no significant differences were found. In another case, significantly higher infiltration rates occurred only during the 3-8 and 23-28 minute time intervals for the treated and control areas, respectively. For the remaining site there were no significant differences in infiltration rates between the treated and control areas throughout the storm. The control had a significantly higher average potential sediment loss in all cases except 4. In 3 of these no significant differences in sediment loss was found. On the remaining site the treated area exhibited the significantly higher sediment loss. On the sagebrush ecosystem sampled, where sagebrush was mechanically removed and the area seeded, the treated area had significantly lower infiltration rates than the control and a lower average potential sediment loss. The control for a thinned pine-mixed fir-sedge ecosystem in fair condition not only had a significantly higher average potential sediment loss but also had a significantly higher infiltration rate than the treated area for the 3-8 minute time interval after which no significant differences in infiltration rates occurred. On a thinned and seeded pine mixed fir-sedge ecosystem in good condition, on which seeding establishment appeared unsuccessful, infiltration rates were significantly higher for the treated area for the entire storm. However, no significant differences in average potential sediment loss were found. A thinned larch ecosystem was divided into a pinegrass, a seeded and a bareground area and each area was sampled separately. In all 3 cases, the control had significantly higher infiltration rates throughout the storm as well as a significantly lower average potential sediment loss. On 1 of the 2 pine-sedge ecosystems the treated area had significantly higher infiltration rates for the entire storm as well as a significantly lower average potential sediment loss. On the other pine-sedge ecosystem, divided into non-vegetated and vegetated areas, the control of non-vegetated portion exhibited significantly higher infiltration rates and a lower average potential sediment loss than the treated area, whereas, no significant difference in infiltration rates or sediment loss was found between the control and treated area on the vegetated portion. On a thinned ponderosa pine-bunchgrass ecosystem although infiltration rates were significantly higher for the treated area during the entire run, no significant difference in average potential sediment loss was found.