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Articles 2341 - 2370 of 2388
Full-Text Articles in Fresh Water Studies
Reducing Evaporation From Farm Dams : A Progress Report December 1969, I A F Laing
Reducing Evaporation From Farm Dams : A Progress Report December 1969, I A F Laing
Journal of the Department of Agriculture, Western Australia, Series 4
IN most seasons in the Western Australian Wheatbelt evaporation reduction techniques rate a low priority due to either the expense or the relative inefficiency of the techniques.
It is generally agreed that a similar investment in deepening or enlarging existing dams, or making new dams larger from the outset, is likely to be more profitable.
Distribution Of Trace Elements In Impoundments, J. Nix
Distribution Of Trace Elements In Impoundments, J. Nix
Arkansas Water Resources Center Technical Reports
An investigation of the trace element content of two impoundments on the Ouachita River, Arkansas, was conducted. Common water quality parameters were followed in the reservoirs in an effort to determine the factors which were influencing the trace element concentration. The following trace metals were determined in both the particulate phase (retained by a 0.45 micron filter) and the soluble phase (passed by a 0.45 micron filter): iron, manganese, copper, cobalt, nickel, lead, chromium, and zinc. These measurements were made periodically for one and a half years. Results indicate that the chemical regime of the impoundments which were studied was …
Water Resources Planning Study For Arkansas And Oklahoma, L. R. Heiple, H. M. Jeffus
Water Resources Planning Study For Arkansas And Oklahoma, L. R. Heiple, H. M. Jeffus
Arkansas Water Resources Center Technical Reports
The purpose of this study is to make an appraisal of the local water resources in the Arkansas River Basin common to the two States of Arkansas and Oklahoma as defined by the Arkansas-Oklahoma Compact Committee (hereinafter referred to as "the Compact Committee"). A review, analysis, and correlation has been made of hydrologic data previously collected by others. Consideration is given to the evaluation at selected sites of the storage and potential use of existing water sources.
Virus Movement In Groundwater Systems, William A. Drewry
Virus Movement In Groundwater Systems, William A. Drewry
Arkansas Water Resources Center Technical Reports
The purpose of this study is to investigate the extent to which soil acts as an agent in the transmission of waterborne viruses. Since many waterborne outbreaks of viral diseases have involved small wellwater supplies contaminated by effluents from subsurface wastewater disposal systems, there is a great need for such information. Results of this study show that virus adsorption by soils is greatly affected by the pH, ionic strength, and soil-water ratio of the soil-water system and various soil properties. Also, it is shown that one cannot predict the relative virus adsorbing ability of a particular soil based on the …
Subsurface Irrigation Research In Arkansas, John P. Hoskyn, Billy B. Bryan
Subsurface Irrigation Research In Arkansas, John P. Hoskyn, Billy B. Bryan
Arkansas Water Resources Center Technical Reports
A pilot study conducted in 1963 indicated that (1) cotton yields could be increased by subirrigation, (2) drilled orifices were unsatisfactory because of internal plugging caused by burrs and drilling particles, and (3) operating pressures of 5 and 10 psi were excessive, and 5 psi probably should be considered as an upper-limit pressure. A greenhouse study of a subirrigation system indicated that 2 psi should, in general, for in-wall orifices, be considered as a lower-limit pressure when orifices are built into the pipe wall. The greenhouse study also indicated that a placement depth of 12 inches was preferable to 18 …
Fishery Report Iv (4) - Report On The Barramundi Fishery In Western Australia, N M. Morrissy
Fishery Report Iv (4) - Report On The Barramundi Fishery In Western Australia, N M. Morrissy
Fisheries Research Reports
Barramundi are widely distributed in rivers and estuaries in the semi-tropical and tropical regions of the Indo- Pacific from South China to the Persian Gulf and along the coast of northern Australia. The limiting factors to the distribution appear to be temperature and salinity.
Water Storage Has Not Kept Pace With Stock Numbers : South Stirling Survey Finding, A L. Prout
Water Storage Has Not Kept Pace With Stock Numbers : South Stirling Survey Finding, A L. Prout
Journal of the Department of Agriculture, Western Australia, Series 4
RESULTS of a survey on water storage capacity in the South Stirlings area indicate that farm water storage has not kept pace with increased clearing and stock numbers.
This has resulted in many farmers requesting advice on water conservation projects following two consecutive years of low rainfall runoff.
Soil And Plant Water Studies On Wheat Summary Of Results 1969/70, D Tennant
Soil And Plant Water Studies On Wheat Summary Of Results 1969/70, D Tennant
Experimental Summaries - Plant Research
Location
Trials were carried out within a radius of 5 miles of
Tammin on the properties of Messrs P. York and B. Nottage.
Sites represented deep sand, sandy loam, sand/clay and grey
clay soil types.
Implications Of Land And Fresh-Water Gastropods In Archeological Sites, John W. Clark Jr.
Implications Of Land And Fresh-Water Gastropods In Archeological Sites, John W. Clark Jr.
Journal of the Arkansas Academy of Science
No abstract provided.
Biological Studies Of Selected Reaches And Tributaries Of The Colorado River, Nelson Thomas, Federal Water Pollution Control Administration
Biological Studies Of Selected Reaches And Tributaries Of The Colorado River, Nelson Thomas, Federal Water Pollution Control Administration
Publications (WR)
This report fulfills the request of the Colorado River Basin Project, Denver, Colorado, to determine the effects of municipal and industrial wastes on the aquatic life in selected waters of the Colorado River Basin. These studies were conducted with the assistance of personnel from the Colorado River Basin Project.
Morphology And Water Quality In Three Abandoned Granite Quarries, Keith M. Knutson
Morphology And Water Quality In Three Abandoned Granite Quarries, Keith M. Knutson
Journal of the Minnesota Academy of Science
Limnological conditions were studied in two abandoned granite quarries in George Friedrich Park, St. Cloud, Minn. These quarries were excavated from 1886 to 1890 and left shallow due to inadequate water pumping systems at the time. The quarries were less than one hectare in area and had mean depths of 7.3 and 8.2 m. The annual heat budget was about the same for both quarries, 10,535 gm. cal/cm•. Concentrations of [chemical symbols] were determined. Very low concentrations of nitrate nitrogen were found ([chemical symbols]). The hypomimia of both quarries contained hydrogen sulfide throughout the study. Data show West Quarry to …
Water Quality Study Of Lake Mead, Dale A. Hoffman, Paul R. Tramutt, Frank C. Heller, Bureau Of Reclamation
Water Quality Study Of Lake Mead, Dale A. Hoffman, Paul R. Tramutt, Frank C. Heller, Bureau Of Reclamation
Publications (WR)
This report presents Lake Mead Water quality data obtained from 1964 to 1966. The effect of filling Lake Powell on the water quality of Lake Mead is evaluated. General limnological principles and the present limnology of Lake Mead are discussed. Lake Mead has a warm monomictic annual temperature cycle characterized by summer stratification, fall overturn leading into a continuous circulation throughout the winter; temperatures never fall below 39 deg F (4 deg C). During stratification, lower dissolved oxygen values were recorded in the thermocline than in the epilimnion and hypolimnion. Mineral content increases from the upper to the lower end …
Waterways: Comprehensive Regional Plan Series Report Four, East Central Florida Regional Planning Council
Waterways: Comprehensive Regional Plan Series Report Four, East Central Florida Regional Planning Council
City and Regional Planning -- Florida
A plan to make use of the lakes, rivers, canals, and oceans for commerce and other development
Arkansas Water Resources: Supply, Use, And Research Needs, Jared Sparks
Arkansas Water Resources: Supply, Use, And Research Needs, Jared Sparks
Arkansas Water Resources Center Technical Reports
The purpose of this study is to identify Arkansas’ water resources research needs against an economic backdrop of water supply and use conditions existing in the state. In the aggregate Arkansas has an abundance of high quality water relative to present use. There are local conditions that give rise to water problems, but, in general, critical water problems in Arkansas are emergent and potential rather than actual. The causes of these problems are to be found, in large part, in the economic, legal, and social institutions surrounding water use--and particularly in the economic institutions. Research designed to improve economic efficiency …
Quantitative Analysis Of Stream Flow Rate Extremes, Hugh M. Jeffus
Quantitative Analysis Of Stream Flow Rate Extremes, Hugh M. Jeffus
Arkansas Water Resources Center Technical Reports
Stream discharge data for the State of Arkansas is analyzed for representative statistical parameters. The statistical distribution most applicable to stream discharge data in Arkansas is the Pearson type III skew frequency curve. The parameters of the Pearson type III curve for all available records in Arkansas are included as Appendix A. The parameters of the logarithmically normal frequency distribution are included as Appendix B for mean daily discharge, minimum daily discharge and instantaneous minimum daily discharge. The logarithmically normal frequency distribution may be used for the lower discharge rates in lieu of the Pearson type III distribution except where …
Development, Verification, And Use Of Methods To Model Chemical And Thermal Processes Lakes Mead And Powell, Bureau Of Reclamation
Development, Verification, And Use Of Methods To Model Chemical And Thermal Processes Lakes Mead And Powell, Bureau Of Reclamation
Publications (WR)
PURPOSE The purpose of the proposed research is to quantify the effects that Lakes Mead and Powell have on the salinity in the Colorado River system, and to evaluate changes that cap be made to the operating system of the reservoirs (within legal/institutional constraints) to enhance salt precipitation and/or minimize evaporation within the reservoirs. The effect of any changes (i.e., selective withdrawal uses, pumped storage, etc.) on reservoir evaporation could also be evaluated with a goal of minimizing evaporation. This will be accomplished through the development of a mathematical model of the reservoirs as described below. BACKGROUND Two major problems …
Groundwater Aquifer Patterns And Valley Alluviation Along Mountain Fork Creek, Crawford County, Arkansas, H. F. Garner
Groundwater Aquifer Patterns And Valley Alluviation Along Mountain Fork Creek, Crawford County, Arkansas, H. F. Garner
Journal of the Arkansas Academy of Science
No abstract provided.
Fisheries Report No 3 - Western Australian Freshwater Fisheries, Donald D. Francois
Fisheries Report No 3 - Western Australian Freshwater Fisheries, Donald D. Francois
Fisheries Research Reports
Most of the Australian States have a comprehensive system of inland waterways, Western Australia, however, is in a less fortunate position. True, the maps of the State show many rivers, but in much of the southern, more populous part, with no summer rain and no winter snow, the majority are virtually a chain of waterholes during the long summer months. At the same time, in a relatively small section in the south-west corner, there is a series of permanent streams flowing through what was originally dense forest. But apart from the three indigenous freshwater crustaceans, the marron (Cherax tenuimanus), the …
Salinity And Farmhouse Water Supplies, T C. Stoneman
Salinity And Farmhouse Water Supplies, T C. Stoneman
Journal of the Department of Agriculture, Western Australia, Series 4
PROVISION of a satisfactory water supply for the homestead is one of the many problems which have to be faced by all farmers.
For those served by the Comprehensive Water Supply Scheme, the solution is fairly simple.
For others, finding an adequate supply of good quality water can often be quite a headache.
Water Chemistry Survey Of Boulder Basin, Lake Mead, P. R. Tramutt, Bureau Of Reclamation
Water Chemistry Survey Of Boulder Basin, Lake Mead, P. R. Tramutt, Bureau Of Reclamation
Publications (WR)
The survey results indicate that the impoundment of water behind Hoover Dam has not adversely affected the dissolved oxygen (DO) content and that water quality and DO content were uniform regardless of depth. The study made in April-May 1964 will provide water quality data of Lake Mead prior to releases from Lake Powell as a basis for evaluating Lake Powell's effect on water quality and limnology of Lake Mead. The performance of a DO analyzer was tested and found unsatisfactory at depths below 150 ft. Parameters tested by standard chemical analyses of water samples in the Denver Laboratory and by …
The Annual Distribution And Stratification Of Phytoplankton At Aurora Lake, Portage County, Ohio, Harold G. Marshall
The Annual Distribution And Stratification Of Phytoplankton At Aurora Lake, Portage County, Ohio, Harold G. Marshall
Biological Sciences Faculty Publications
A 13-month study of a hard-water lake in northeast Ohio has provided a quantitative and qualitative record of the seasonal changes of the phytoplankton. Maximum production occurred during the summer and winter periods. The summer pulse was dominated by the cyanophyte species: Microcystis aeruginosa, Anabaena spiroides, A. circinalis, and Aphanizomenon flosaquae. The dominants of the winter pulse were the diatoms Fragilaria crotomensis and Asterionella formosa, which formed separate peaks under an ice cover in December and January, respectively. The January development extended into March with the highest concentrations for the year Being reached at approximately …
Available Water Supply Of The Las Vegas Ground-Water Basin Nevada, Glenn Thomas Malmberg
Available Water Supply Of The Las Vegas Ground-Water Basin Nevada, Glenn Thomas Malmberg
Publications (WR)
The Las Vegas ground-water basin as described in this report includes the southern part of Indian Spring Valley, Three Lakes Valley, the northern half of Ivanpah Valley, and Las Vegas Valley. These valleys in part are inferred to form a hydrologic unit that includes an area of about 3,000 square miles in the southern part of Clark County, Nev.
The valleys forming the Las Vegas ground-water basin are broad structural depressions surrounded by mountains. The climate of the region is arid, and precipitation in the basin lowlands rarely exceeds 5 inches per year. Drainage is interior except for occasional Hood …
The Development Of Irrigation In Nebraska, 1854–1910: A Descriptive Survey, Martin Evald Carlson
The Development Of Irrigation In Nebraska, 1854–1910: A Descriptive Survey, Martin Evald Carlson
Department of History: Dissertations, Theses, and Student Research
Preface (excerpted)
The primary purpose of this study is tto trace the development of irrigation in Nebraska from the organization of the state as a territory in 1854 through the rest of the nineteenth century. This period covers the first four stages through which irrigation progressed: individualistic, corporate, district, and state. A brief discussion of the North Platte Project is included, however, in order to carry the story into the fifth and final stage--the development of irrigation with Federal aid, as provided for in the Reclamation Act of 1902.
The emphasis of this work is on the irrigation movement and …
Interbasin Movement Of Ground Water At The Nevada Test Site, Isaac J. Winograd
Interbasin Movement Of Ground Water At The Nevada Test Site, Isaac J. Winograd
Publications (WR)
The present paper presents hydraulic evidence for the interbasin circulation of ground water through carbonate rocks of Paleozoic age at the Nevada Test Site. An integral part of this evidence is the discovery that aquifers in alluvium and tuff, formerly thought to be the principal aquifers at the Test Site, are semiperched above a thick tuffaceous aquiclude that separates them from the carbonate rocks.
This paper is based on one of the studies being made by the Geological
/="/">Survey for the Atomic Energy Commission. These studies seek to evaluate
/="/">the risk that may arise if ground water should …
Preliminary Report: Monolayer Behavior Studies, 1959, Bureau Of Reclamation
Preliminary Report: Monolayer Behavior Studies, 1959, Bureau Of Reclamation
Publications (WR)
During the fall of 1959, monolayer behavior studies were made on two lakes in the southwest; Boulder Basin of Lake Mead, Nevada, and Lake Sahuaro near Phoenix, Arizona. These studies were made to evaluate the effect of geographical and climatological conditions on movement and behavior of monolayers. The Lake Sahuaro tests also were used to provide data for design and development of improved methods of application and maintenance of a film on this lake in anticipation of full scale, evaporation-reduction tests to be performed there during the summer of I960. The Lake Mead studies produced the following general points of …
Contour Banks For Filling Dams, B A'B Marsh
Contour Banks For Filling Dams, B A'B Marsh
Journal of the Department of Agriculture, Western Australia, Series 4
A LTHOUGH contour banks have been used in this State for many years to lead water into earth tanks or "dams," it is only comparatively recently that the idea has become really popular.
Thanks to the publicity given to this matter during the last three years many farmers now know that dams may be filled by contour banks, but because they do not know the finer points of the method, they are apt to mislead themselves into thinking that their territory is unsuitable for putting it into practice.
Three-Year Creel Census Of Lake Catherine, Lake Hamilton, And Lake Ouachita, Arkansas, James H. Stevenson, Clinton Richards
Three-Year Creel Census Of Lake Catherine, Lake Hamilton, And Lake Ouachita, Arkansas, James H. Stevenson, Clinton Richards
Journal of the Arkansas Academy of Science
No abstract provided.
Preliminary Report Of Standing Crop And Rates Of Harvest In Lake Fort Smith, Arkansas:1957 Through 1958, Charles F. Cole, Samuel L. Finkelstein
Preliminary Report Of Standing Crop And Rates Of Harvest In Lake Fort Smith, Arkansas:1957 Through 1958, Charles F. Cole, Samuel L. Finkelstein
Journal of the Arkansas Academy of Science
No abstract provided.
Comparisons Of Growth Rates Of Game Fish In Lake Catherine, Lake Hamilton, And Lake Ouachita, Arkansas, Andrew H. Hulsey, James H. Stevenson
Comparisons Of Growth Rates Of Game Fish In Lake Catherine, Lake Hamilton, And Lake Ouachita, Arkansas, Andrew H. Hulsey, James H. Stevenson
Journal of the Arkansas Academy of Science
No abstract provided.
Branchiobdellidae In Arkansas, David Causey
Branchiobdellidae In Arkansas, David Causey
Journal of the Arkansas Academy of Science
No abstract provided.