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Tuesday, May 19, 2020 | History

2 edition of Watershed and climate influences on flood frequency distributions in the Willamette River basin found in the catalog.

Watershed and climate influences on flood frequency distributions in the Willamette River basin

Timothy Victor Tolle

Watershed and climate influences on flood frequency distributions in the Willamette River basin

by Timothy Victor Tolle

  • 30 Want to read
  • 34 Currently reading

Published .
Written in English

    Subjects:
  • Floods -- Willamette River Basin.

  • Edition Notes

    Statementby Timothy Victor Tolle.
    The Physical Object
    Pagination[9], 167 leaves, bound :
    Number of Pages167
    ID Numbers
    Open LibraryOL14228786M

      The influence of climate indices and the effect of reservoir constructions on the Narmada River Basin have been included as external covariates. The results indicated that the construction of reservoirs has played a major role for the changing behavior of flood series of Narmada River Basin from stationary to nonstationary. Pollution of the Tualatin River is caused by the heavy degree of development that is imposed on the limited resources of the watershed. The normal low summer stream- flows are further reduced by irrigation with- drawals, and the wastes of a number of com- munities and industries are discharged into the river.

    Together the 13 federal reservoirs in the Willamette River Basin help to mitigate water scarcity. Although the reservoirs were primarily built for flood control, they also provide a large capacity – a combined million acre-feet – to store water from abundant winter and spring streamflows for possible use during the summer when natural flows are low. The Gales Creek Sub-Basin has been identified by the Tualatin River Watershed Council as a high-priority area for Upper Willamette River (UWR) steelhead spawning and rearing as well as for other native fish and wildlife. Many Tualatin River Basin partners have been active in restoration projects throughout the Gales Creek Sub-Basin.

    •>x\. j i " v.j~"~"" «"t".t ~~'i willamette river basin location mip satisfactory1 for all existjwg h'ater use undesirable for some cxistinc water use unoesirae for all existing water use nuisance exists willamette river basin present stream status federal security agency public hfolfh serviu division of water pollution control. Together the 13 federal reservoirs in the Willamette River Basin help to mitigate water scarcity. Although the reservoirs were primarily built for flood control, they also provide a large capacity – a combined million acre-feet – to store water from abundant winter and spring streamflows for possible use during.


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Watershed and climate influences on flood frequency distributions in the Willamette River basin by Timothy Victor Tolle Download PDF EPUB FB2

Lakes and ponds act as sinks on all peak flows, and streams which flow through them have less steep flood frequency curves. In combination with watershed relief and mean annual precipitation, these three variables explain 86% of the stream-to-stream differences in the slopes of flood frequency curves in the Willamette River : Timothy Victor Tolle.

Watershed and climate influences on flood frequency distributions in the Willamette River basin. Abstract. Graduation date: Problem areas identified are: The needs a) to develop curve\ud fitting procedures to estimate flood flow distributions; b) to\ud incorporate precipitation data into frequency analysis procedures;\ud and c) to.

Watershed and Climate Influences on Flood Frequency Distributions in the Willamette River Basin CHAPTER ONE PROBLEM AND OBJECTIVES I. RESEARCH TOPIC An accurate estimate of the flood potential at any site is a key element to an effective flood damage abatement program.

To-date, flood estimates have been imprecisely defined despite much effort to that end. The Willamette River Basin includes parts of five ecoregions that are defined by a combination of geology, topography, climate, and other ecological : Greg D. Lind, Adam J. Stonewall.

Study location. Oregon's Willamette River, located in western Oregon, has a drainage area of 29, km 2, with the thirteenth highest streamflow of rivers in the conterminous United States (Baker et al. ).The basin has a Mediterranean climate with dry summers and wet winters where most precipitation occurring between November and June.

Willamette River Basin Restoration Priorities: Watershed Summaries – December Page Fanno Creek Watershed Restoration Priorities Overview. Fanno Creek is a tributary to the Tualatin River Basin, which drains ab acres. Of that land area, 4, acres falls within the City of Portland Size: 1MB.

This paper explores the watershed response to climate change in the upper Umatilla River Basin (URB) where runoff behavior is observed before and after fire-burns in the 21st century.

Seasonal flows, the ratio of snow water equivalent to precipitation and potential recharge were quantified. Three research questions guided this by: 2. For the Willamette River Basin (Oregon), climate change was projected to result in an increased seasonal variability in runoff with increases in fall and winter and decreases in spring and summer.

On the basis of hydrogeomorphic perspective of flood, we have considered the following five prime objectives of study: (1) understanding the geohydrological set-up of Damodar River Basin, (2) analyzing the influence of monsoon rainfall on flood risk, (3) estimating potential runoff to understand the magnitude of flood discharge, (4) quantifying Cited by: 8.

The Willamette Basin encompasses a drainage of 12, square miles and is home to approximately 70 percent of Oregon’s population.

Agriculture and population are concentrated in the lowland, a broad, relatively flat area between the Coast and Cascade Ranges. As a result, the water shortage in the lower Tarim River Basin will be increasingly severe under the influence of climate change and human activities.

To alleviate the shortage would call for the development of water-saving agricultural irrigation, water-saving technology, conservation of eco-environment and sustainable development of local. Wapiti River Watershed Study Year One DRAFT Progress Report 1 INTRODUCTION The Wapiti River Watershed has received considerable inventory effort however projects have been directed at specific issues and sub-basins (Lucko andSchroederSchwanke et al.

and Swanson ) and are limited in Size: 1MB. Water intro - MB PDF; Stream network - MB PDF; Historical river channel - MB PDF; Off-channel habitats - KB PDF; Flood inundation/FEMA - KB PDF; DamsMB PDF; Revetments - KB PDF; Water sources - KB PDF. The Danube River with its basin is an important region in Europe and floods have occurred in the Danube River basin throughout history.

Flood frequency analysis. The greatest Willamette River flood in recorded history began inwell before the construction of dams in the watershed. [] Rainstorms and warm temperatures in December combined with a well-above-average snowpack in the Cascades created the Mouth: Columbia River. Changes in Flood Frequency 2 0 5 4.

Changes in Hydrological Drought Frequency 2 0 6 4. 1 0. Water Quality 2 0 7 4. Glaciers and Small Ice Caps 2 0 8 4.

1 2. River Channel Form and Stability 2 0 9 4. 1 3. Climate Change and Climatic V a r i a b i l i t y 2 0 9 4. E f fects on W a t e r W i t. Using data of temperature, wind, precipitation, water discharge, and sediment load, the changes in runoff and sediment load of the Xiliugou basin in the upper Yellow River were investigated and the contributions of climate change and human activities to these changes were quantitatively estimated.

Results show that the runoff and sediment load of the stream declined gradually in &#x;Cited by: 5. Figure — The Willamette River Basin (grey) is the 19th largest river by discharge and the wettest (precipitation/land area) in the United States.

It also supports one of the few remaining harvest locations for Pacific lamprey at Willamette Falls, near Portland, OR. The river is about 90 miles long and drains an area of about 1, square miles.

Since the early s, streamflow in the McKenzie River basin has been altered through the construction of dams and canals. Two major flood control dams, a hydropower dam complex, and two hydropower canals significantly affect streamflows in the river.

Willamette River Basin Plans and Reports Anything else to add. Willamette Basin Plans and Reports September 3. The lower Baro-Akobo basin is a flood plain region located downstream of Gambella up to Sudan border and is not suitable for construction of flood frequency curves due to significant overbank flow along the river channel system.

Water resources planning in this part of the basin requires flood .The Willamette River Basin Planning Atlas offers a valuable resource for anyone interested in the region's past, present, and future.

Using a dazzling variety of color maps, charts, and photographs, the Atlas presents a vast amount of information intended to provide a long-term, large-scale view of changes in human and natural systems within.Semu Ayalew Moges, Meron Teferi Taye, in Extreme Hydrology and Climate Variability, Introduction.

Flood frequency analysis is a technique commonly used to relate the magnitude of extreme runoff or river flow events to their frequency of occurrence through the use of probability distribution functions. Historical records provide essential information to predict the recurrence.