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Articles 511 - 531 of 531
Full-Text Articles in Fresh Water Studies
Digital Systems For On-Site Collection For Water Quality Analysis, M. K. Testerman
Digital Systems For On-Site Collection For Water Quality Analysis, M. K. Testerman
Arkansas Water Resources Center Technical Reports
A prototype system has been developed for recording and transmitting digital data at a remote water quality monitoring station in an unattended manner. As many as eight analog signals from transducers, which measure water quality characteristics such as dissolved oxygen, temperature, pH, chlorides, conductivity, redox, and turbidity, are converted to digital signals and recorded in binary coded decimal format on magnetic tape. This unit may be contacted from a central station for playback of the day's recording. The transmitted data can be recorded at the central station by teletype. Each data record includes a time-of-day "word" so that all data …
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 …
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.
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 …
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.
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.
Annual Temperature Study Of Five Northwest Arkansas Lakes, Carl E. Hoffman, Andrew H. Hulsey, Charles Nelson, Bobby Owen, Buford Tatum
Annual Temperature Study Of Five Northwest Arkansas Lakes, Carl E. Hoffman, Andrew H. Hulsey, Charles Nelson, Bobby Owen, Buford Tatum
Journal of the Arkansas Academy of Science
No abstract provided.
Some Chemical Changes Resulting From Industrial Waste Disposal In The Ouachita River, Carl E. Hoffman
Some Chemical Changes Resulting From Industrial Waste Disposal In The Ouachita River, Carl E. Hoffman
Journal of the Arkansas Academy of Science
No abstract provided.
Comments On The Bacillariophycaea Of North Central Arkansas, Albert Robinson Jr.
Comments On The Bacillariophycaea Of North Central Arkansas, Albert Robinson Jr.
Journal of the Arkansas Academy of Science
No abstract provided.
On Arkansas Microndrili, David Causey
On Arkansas Microndrili, David Causey
Journal of the Arkansas Academy of Science
No abstract provided.
Limnological Studies In Arkansas. Ii. The Effect Of Intense Rainfall On The Abundance And Vertical Distribution Of Plankton In Lake Fort Smith, Arkansas, Carl E. Hoffman
Limnological Studies In Arkansas. Ii. The Effect Of Intense Rainfall On The Abundance And Vertical Distribution Of Plankton In Lake Fort Smith, Arkansas, Carl E. Hoffman
Journal of the Arkansas Academy of Science
No abstract provided.
Limnological Studies In Arkansas. I. Physico-Chemical And Net Plankton Studies Of Lake Fort Smith In Its Fourth Year Of Impoundment, Carl E. Hoffman, David Causey
Limnological Studies In Arkansas. I. Physico-Chemical And Net Plankton Studies Of Lake Fort Smith In Its Fourth Year Of Impoundment, Carl E. Hoffman, David Causey
Journal of the Arkansas Academy of Science
No abstract provided.
Limnological Studies In Arkansas, Carl E. Hoffman
Limnological Studies In Arkansas, Carl E. Hoffman
Journal of the Arkansas Academy of Science
No abstract provided.
Freshwater Sponges In Arkansas, David Causey
Freshwater Sponges In Arkansas, David Causey
Journal of the Arkansas Academy of Science
No abstract provided.