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Articles 7471 - 7500 of 8291

Full-Text Articles in Physical Sciences and Mathematics

Modeling The Performance Of The Intermittent Sand Filter, P. A. Cowan, E. J. Middlebrooks Jan 1979

Modeling The Performance Of The Intermittent Sand Filter, P. A. Cowan, E. J. Middlebrooks

Reports

Several models were developed to predict the efficiency of the intermittent sand filter (ISF) in removing algae from wastewater stabilization pond effluent; volatile suspended solids (VSS) was the analytical technique used to identify algal concentrations. The first (ISF model) and second (modified ISF model) models consisted of two distinct portions: a surface algal layer (SAL) component and a sand phase component. In the ISF model, the sand phase component was described in terms of 20 empirical sand filter efficiency terms (20 ^ coefficients); in the modified ISF model, a functional relationship between ^ and filter depth was developed. The modified …

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Tabulation And Application Of Pan Evaporation Data For Utah Through 1976, Kenneth G. Hubbard Jan 1979

Tabulation And Application Of Pan Evaporation Data For Utah Through 1976, Kenneth G. Hubbard

Reports

Monthly values of evaporation, wind movement and water temperatures are presently for all available station in Utah. A brief review is given of factors which effect evaporation along with several examples of how pan evaporation data ware used.

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Effects Of Oil Shale Leachate On Phytoplankton Productivity, Mary Louise Cleave, V. Dean Adams, Donald B. Porcella Jan 1979

Effects Of Oil Shale Leachate On Phytoplankton Productivity, Mary Louise Cleave, V. Dean Adams, Donald B. Porcella

Reports

The effects of oil shale leachate and salinity additions on the productivity of freshwater algae were studied in the laboratory using batch bioassays. These batch bioassays were used to screen variations of ten salts in single and multiple additions of all possible combinations of the ten salts; water extractions of different processed and unprocessed oil shales; and the concentration effects of both the salts from 0.3 N to 0.05 N as NaCl and the oil shale extractions on the growth of standard test algae and indigenous algae from Lake Powell. The batch bottle bioassays were conducted following the standard algal …

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How Saltland Can Be Reclaimed, A J. Peck Jan 1979

How Saltland Can Be Reclaimed, A J. Peck

Journal of the Department of Agriculture, Western Australia, Series 4

Some possibilities for reclamation of saltland.

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Impact Of Water And Soils Having High Source-Sink Potentials On Water And Salinity Management Under Irrigation In The Upper Colorado River Basin, Lyman S. Willardson, R. J. Hanks, J. J. Jurinak Jan 1979

Impact Of Water And Soils Having High Source-Sink Potentials On Water And Salinity Management Under Irrigation In The Upper Colorado River Basin, Lyman S. Willardson, R. J. Hanks, J. J. Jurinak

Reports

Water management in irrigation projects is one potential method for reducing downstream salinity in the Colorado River. An important contribution can be made to developing more effective irrigation water management practices for water conservation and salinity control through identification and better understanding of the soil and water interactions that result in soils behaving as salt sources or as salt sinks. The interactions identified in this study were examined to determine the effects of various management alternatives on the quality and quantity of salt in subsurface return flow from irrigation projects. A soil solution chemistry model was developed to describe the …

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A Mathematical Hydrodynamic Circulation Model Of Great Salt Lake For Resource Management, Gary Z. Watters, Charles T. Kincaid Jan 1979

A Mathematical Hydrodynamic Circulation Model Of Great Salt Lake For Resource Management, Gary Z. Watters, Charles T. Kincaid

Reports

In the Great Basin region of this country, the resource which has always been of great importance is water. In Utah, the proper management of the resources of Great Salt Lake and the watersheds tributary to it, has become a topic of increasing concern. Recently, much emphasis has been placed on developing the recreational and industrial resources of Great Salt Lake. For optimum economic and social benefits from future development plans, the lake and its tributary watersheds need to be considered in terms of a single entity. In this regard, the Utah Water Research Laboratory (UWRL) has conducted several studies …

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Algal Bioassay Study For The Animas - La Plata Project, Leslie G. Terry, V. Dean Adams Jan 1979

Algal Bioassay Study For The Animas - La Plata Project, Leslie G. Terry, V. Dean Adams

Reports

No abstract provided.

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Evaluation Of In-Line Direct Filtration For Virus Removal, Behjat Sadat Malek, Dennis B. George, Daniel S. Filip, Bill B. Barnett Jan 1979

Evaluation Of In-Line Direct Filtration For Virus Removal, Behjat Sadat Malek, Dennis B. George, Daniel S. Filip, Bill B. Barnett

Reports

The purposes of this study were to evaluate virus removal in treatment of water supplies by an in-line direct filtration pilot plant system and to suggest a system design to enhance virus removal. Isotherm and jar tests were conducted to evaluate the effects of pH, sodium ion concentration, and coagulants (alum and cationic polyelectrolytes Cat-Floc T, Nalco 8102, and 8103) on the bacteriophage MS2 contained in water. Isotherm studies were also conducted to assess the kinetic adsorption of MS2 to sand, anthracite, and garnet. Rapid sand, dual-media, and multi-media filters were tested in continuous in-line direct filtration operations. Approximately 95 …

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Woodruff Narrows: Low Head Hydroelectric Power Plant Feasibility Determination, State Of Utah - Division Of Water Resources International Engineering Company, Inc. Jan 1979

Woodruff Narrows: Low Head Hydroelectric Power Plant Feasibility Determination, State Of Utah - Division Of Water Resources International Engineering Company, Inc.

Reports

Chapter 1 - Summary:

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Cyclic Pressure Tests Of Direct Tapped C-900 Pvc Pipe, Roland W. Jeppson Jan 1979

Cyclic Pressure Tests Of Direct Tapped C-900 Pvc Pipe, Roland W. Jeppson

Reports

Performance testing of direct-tapped PVC pressure pipe was conducted at the Utah Water Research Laboratory to verify and document its capabilities under cyclic pressure conditions. Twelve samples of nominal six-inch diameter, pressure class 150 PVC pipe, manufactured to satisfy the requirements of AWWA Standard C900, were obtained from Uni-Bell Member producers. Five pipe samples were tapped and fitted with ¾ inch corporation stops under a line pressure of 80 +- 5psi. Another five samples were tapped fitted with one inch corporation stops under a pressure of 150 psi. Only corporation stops complying with AWWA Standard C800 were used. The remaining …

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Estimation Of Water Surface Elevation Probabilities And Associated Damages For The Great Salt Lake, L. Douglas James, David S. Bowles, W. Robert James, Ronald V. Canfield Jan 1979

Estimation Of Water Surface Elevation Probabilities And Associated Damages For The Great Salt Lake, L. Douglas James, David S. Bowles, W. Robert James, Ronald V. Canfield

Reports

Rising water surface elevations in perennial terminal lakes threaten major damages to shoreline industrial plants, transportation routs, and wetlands. Falling elevations increase pumping costs for industries extracting minerals from the lake water and reduce the quality of shoreline recreation. The managers of these properties need information on future lake level probabilities for planning, and public agencies need information on both probabilities and damages to determine whether lake level control is justified. Standard methods for estimating flood frequency and damages in riverine areas do not work well for terminal lakes because of the interdependency in annual peaks and the long advanced …

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Domestic Water Demand In Utah, Trevor C. Hughes, Robert Gross Jan 1979

Domestic Water Demand In Utah, Trevor C. Hughes, Robert Gross

Reports

Multiple regression and frequency analysis of average month, peak month, peak day, and instantaneous water use by various water supply systems in Utah and Colorado are used to develop water demand functions. The research objective was to predict water demand as a function of a small number of independent variables for which data were easily obtainable and thereby provide an attractive method for use by consulting engineers inf uture planning studies. The independent variables in landscaped area and accounts for use of supplementary ditch or pressure irrigation systems. The demand functions were developed with data from a sample of 14 …

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Research On Increased Winter Orographic Precipitation By Cloud Seeding (Fy 1979) Development Of Cloud Seedability Criteria, Geoffrey E. Hill Jan 1979

Research On Increased Winter Orographic Precipitation By Cloud Seeding (Fy 1979) Development Of Cloud Seedability Criteria, Geoffrey E. Hill

Reports

This research continues the exploration of improved cloud seeding technology through the use of airborne seeding, cloud physics measurements from a research aircraft and ground based measurements for the purpose of understanding transport and diffusion of seeding material, developing seedability criteria, and documenting in-cloud responses to seeding. Development of precipitation measuring and memory devices was continued with the aim of obtaining a network of gages well suited for measurement of winter snowfall in mountainous regions. Results of the research are highlighted by the development of criteria for seeding winter orographic storms. It was found that the cloud top temperature and …

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Groundwater Heat Pump: An Efficient Way To Heat And Cool Your Home, Calvin G. Clyde, E. W. Vendell, K. Hagen Jan 1979

Groundwater Heat Pump: An Efficient Way To Heat And Cool Your Home, Calvin G. Clyde, E. W. Vendell, K. Hagen

Reports

Engineers at the Utah Water Research Laboratory and the Mechanical Engineering Department at Utah State University have looked into the evonomic feasibility of groundwater heat pumps for residential heating and cooling in the Utah climate. They have found that this type of system conserves evergy and may cost less than conventional heating systems. By using a heat pump, thermal energy can be taken from goundwater and can be used to heat homes in the winder and cool them in the summer. If you are a Utah homeowner in an area where the goundwater heat pump system is economical, you may …

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A Resource Survey Of Hydroelectric Power Potential In Utah And Southeast Idaho, Calvin G. Clyde, Eugene K. Israelsen, Win-Kai Liu Jan 1979

A Resource Survey Of Hydroelectric Power Potential In Utah And Southeast Idaho, Calvin G. Clyde, Eugene K. Israelsen, Win-Kai Liu

Reports

N searching for alternative sources of energy to supply growing demands, it is essential that renewable sources by thoroughly considered. An essential early step in further hydroelectric power development is to understand in detail the amount and location of the resource. This survey of hydroelectric power potential covers the entire State of Utah, the Bear River Basin in Idaho and Wyoming, and the small part of the Snake River drainage lying in the Utah Power and Light Company service area in Idaho. Streams were covered initially if their flow was estimated to exceed 36 cfs 50 percent of the time. …

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Proceedings Of The Utah Water Pollution Control Association, 1979 Annual Meeting, Kathleen E. Bayn Jan 1979

Proceedings Of The Utah Water Pollution Control Association, 1979 Annual Meeting, Kathleen E. Bayn

Reports

Preface: This volume is the third published proceedings of the Utah Water Pollution Control Association's Annual Meeting. The Technical Program of the 1979 Annual Meeting was divided into four separate sessions. The opening session (Session I) provided an overview and direction for the entire meeting. Session II-A: Plant Safety, and Session III-A: Plant Safety, centered on the need for establishing appropriate safety procedures at wastewater installations. Session II-B: Selected Topics, was devoted to technical presentations of speical merit and interest to the local environmental engineering profession. Session III-B: Interim Upgrading, considered various alternatives to upgraiding wastewater facilities on an interim …

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Pre-Impoundment Water Quality Study For The Mancos Project, Larry Baker, V. Dean Adams, Leslie G. Terry, Jerald S. Fifield, Darwin L. Sorensen Jan 1979

Pre-Impoundment Water Quality Study For The Mancos Project, Larry Baker, V. Dean Adams, Leslie G. Terry, Jerald S. Fifield, Darwin L. Sorensen

Reports

Introduction: The U.S. Bureau of Reclamation is currently in the process of evaluating a number of water development projects in Southwest Colorado. As a part of the planning process the Bureau has conducted a water quality investigation, in cooperation with the UWRL, of the stream segments that will be affected by each project. The data collected in this study were used to evaluate the water quality of each stream segment with respect to various beneficial uses of water (agriculture, raw municipal water supply, protection of the aquatic biota) and will provide a baseline by which to assess the impact of …

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Pre-Impoundment Water Quality Study For The Dolores Project, Larry Baker, V. Dean Adams, Leslie G. Terry, Jerald S. Fifield, Darwin L. Sorensen Jan 1979

Pre-Impoundment Water Quality Study For The Dolores Project, Larry Baker, V. Dean Adams, Leslie G. Terry, Jerald S. Fifield, Darwin L. Sorensen

Reports

No abstract provided.

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Pre-Impoundment Water Quality Study For The Mc Elmo Project, Larry Baker, V. Dean Adams, Leslie G. Terry, Jerald S. Fifield, Darwin L. Sorensen Jan 1979

Pre-Impoundment Water Quality Study For The Mc Elmo Project, Larry Baker, V. Dean Adams, Leslie G. Terry, Jerald S. Fifield, Darwin L. Sorensen

Reports

Introduction: The U.S. Bureas of Reclamation is currently in the process of evaluating a number of water development projects in Southwest Colorado. As a part of the planning process the Bureasu has conducted a water qualtiy investigation, in cooperations with the UWRL, of the stream segments that will be affected by each project. The data collected in this study were used to evaluate the water quality of each stream segment with respect to various beneficial uses of water (agriculture, raw municipal water supply, protection of the aquatic biota) and will provide a baseline by which to assess the impact of …

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Pre-Impoundment Water Quality Study For The West Divide Project, Larry Baker, V. Dean Adams, Leslie G. Terry, Jerald S. Fifield, Darwin L. Sorensen Jan 1979

Pre-Impoundment Water Quality Study For The West Divide Project, Larry Baker, V. Dean Adams, Leslie G. Terry, Jerald S. Fifield, Darwin L. Sorensen

Reports

Introduction: The U.S. Bureas of Reclamation is currently in the process of evaluating a number of water development projects in Southwest Colorado. As a part of the planning process the Bureasu has conducted a water qualtiy investigation, in cooperations with the UWRL, of the stream segments that will be affected by each project. The data collected in this study were used to evaluate the water quality of each stream segment with respect to various beneficial uses of water (agriculture, raw municipal water supply, protection of the aquatic biota) and will provide a baseline by which to assess the impact of …

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The Causes Of Saltland : A Case Study At Esperance, P R. George, S. C. Bull Jan 1979

The Causes Of Saltland : A Case Study At Esperance, P R. George, S. C. Bull

Journal of the Department of Agriculture, Western Australia, Series 4

A series of bores on the Esperance Downs Research Station has demonstrated that the groundwater levels change after clearing, and the relatiojnnship between groundwater levels and soil salinity has been emphasised. This pattern of hydrological change leading to soil salinity problems applies widely in the wheatbelt.

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Shoreline Situation Report Richmond County, Virginia, Dennis W. Owen, Lynne C. Morgan, Nancy M. Sturm, Robert J. Byrne, Carl H. Hobbs Iii Jan 1979

Shoreline Situation Report Richmond County, Virginia, Dennis W. Owen, Lynne C. Morgan, Nancy M. Sturm, Robert J. Byrne, Carl H. Hobbs Iii

Reports

No abstract provided.

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Shoreline Situation Report Counties Of Fairfax And Arlington, City Of Alexandria, Dennis W. Owen, Lynne C. Morgan, Nancy M. Sturm, Robert J. Byrne, Carl H. Hobbs Iii Jan 1979

Shoreline Situation Report Counties Of Fairfax And Arlington, City Of Alexandria, Dennis W. Owen, Lynne C. Morgan, Nancy M. Sturm, Robert J. Byrne, Carl H. Hobbs Iii

Reports

No abstract provided.

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Volume 2, Number 12 (December 1978), The Otec Liaison Dec 1978

Volume 2, Number 12 (December 1978), The Otec Liaison

The OTEC Liaison

No abstract provided.

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Emission Of Microbial Aerosols From Polluted Waters In Densely Populated Regions, Lois S. Cronholm Dec 1978

Emission Of Microbial Aerosols From Polluted Waters In Densely Populated Regions, Lois S. Cronholm

KWRRI Research Reports

The air surrounding three activated sludge tanks was sampled over a two year period for the emission of bacterial aerosols under a variety of climatic conditions and at varying distances upwind and downwind of the aerated tanks. All plants emitted species of enteric bacteria which are significant as index organisms and as frank pathogens. The emission pattern of these bacteria were influenced by distance from the plant and wind direction. Within the parameters of a plant, defined arbitrarily in this study by sampling sites less than 150 m upwind and less than 900 m downwind, distance from the source was …

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Water Current, Volume 10, No. 6, November/December 1978 Nov 1978

Water Current, Volume 10, No. 6, November/December 1978

Water Current Newsletter

From the Desk of the Director
Proposal Deadlines
Water Resources Seminar Series
FY 1979 Projects Underway
Water Resources in Nebraska
39 Water Research Grants Approved by OWRT
Discount Rate Set at 6 7/8%
Study on Energy Conservation in Irrigated Agriculture
Research Review: Impact of an Introduced Fish Species (Morone americana) on the Fisheries Resources of Nebraska

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Volume 2, Number 11 (November 1978), The Otec Liaison Nov 1978

Volume 2, Number 11 (November 1978), The Otec Liaison

The OTEC Liaison

No abstract provided.

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A Limnological Study Of Ricks Pond And The Gulpha Creek Drainage In Garland County, Arkansas, Tom M. Buchanan, James Houston, Joe F. Nix, Richard L. Meyer, Eugene H. Schmitz Nov 1978

A Limnological Study Of Ricks Pond And The Gulpha Creek Drainage In Garland County, Arkansas, Tom M. Buchanan, James Houston, Joe F. Nix, Richard L. Meyer, Eugene H. Schmitz

Technical Reports

A limnological investigation of Ricks Pond and the Gulpha Creek drainage of Garland County, Arkansas was conducted between 1 June 1978, and 21 August 1978. Water samples taken from ten stations on three different dates indicated that the stream and pond systems were typical in water quality characteristics of other small, high gradient streams and impoundments in the Ouachita Mountains of Arkansas. In Ricks Pond, thermal stratification occurred along with the development of an oxygen deficient zone below a depth of one meter. Other water quality parameters indicated that Ricks Pond is a moderately productive ecosystem, with the productivity limited …

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Volume 2, Number 10 (October 1978), The Otec Liaison Oct 1978

Volume 2, Number 10 (October 1978), The Otec Liaison

The OTEC Liaison

No abstract provided.

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Development Of A New Technique For The Analysis Of Pesticides In Water, Prasad K. Kadaba, Pramode K. Bhagat, Radko Osredkar, V. R. K. Murthy Oct 1978

Development Of A New Technique For The Analysis Of Pesticides In Water, Prasad K. Kadaba, Pramode K. Bhagat, Radko Osredkar, V. R. K. Murthy

KWRRI Research Reports

A Nuclear Double Resonance Spectrograph has been designed and constructed with emphasis on quadrupolar nuclei of half-integral spins. The use of a data acquisition and processing system featuring the A/D converter, signal averager with built in fast Fourier transformation hardware greatly improves the S/N ratio. The spectrograph has been used to detect certain organochlorine, carbamate and symmetrical triazine pesticides. Concentration levels that can be detected range from 15 to 100 micrograms per liter. Since the measurements are done below ice temperatures, heat-labile compounds can be detected without conversion to more suitable derivatives as in gas chromatography. Fats and oils in …

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