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Articles 7681 - 7710 of 8291

Full-Text Articles in Physical Sciences and Mathematics

Buffalo National River Ecosystems - Part Ii, R. E. Babcock, E. E. Dale, H. C. Macdonald, R. L. Meyer, D. G. Parker, E. B. Smith, K. F. Steele Mar 1976

Buffalo National River Ecosystems - Part Ii, R. E. Babcock, E. E. Dale, H. C. Macdonald, R. L. Meyer, D. G. Parker, E. B. Smith, K. F. Steele

Technical Reports

The priorities were established for the Buffalo National River Ecosystem Studies through meetings and correspondence with Mr. Roland Wauer and other personnel of the Office of Natural Sciences, Southwest Region of the National Park Service. These priorities were set forth in the appendix of contract no. CX 700050443 dated May 21, 1975.


Water Current, Volume 8, No. 2, March/April 1976 Mar 1976

Water Current, Volume 8, No. 2, March/April 1976

Water Current Newsletter

From the Desk of the Director
NWRRI Research Seminar
Water Resources Activities - Agency Overview
AEEP Distinguished Foreign Lecturer
Water Research in Nebraska
Agreement Signed Between WRC and ERDA
Government's Water Pollution Program Questioned
Coal and the Powder River Basin: Five-State Groundwater Study Underway
Research Review


Research For The Development Of Guidelines For Conducting And Analyzing An Environmental Water Quality Study To Determine Statistically Meaningful Results, Melvin D. Springer Mar 1976

Research For The Development Of Guidelines For Conducting And Analyzing An Environmental Water Quality Study To Determine Statistically Meaningful Results, Melvin D. Springer

Technical Reports

This report presents and discusses the basic statistical models and methods which are useful to researchers in the field of water resources research, as well as in other fields. These models and methods are presented from the standpoint of type (parametric and nonparametric - or distribution free) and purpose (e.g., simultaneous comparison of several means, comparison of two or more variances, establishment of a difference between two means with a specified confidence, etc.). The material is presented with emphasis primarily upon methodology, including the necessary assumptions upon which each model is based. No derivations or proofs are given, since these …


Some Of The Effects Of Domestic Sewage Discharged Into Hickman And Jessamine Creeks In Jessamine County, Kentucky, Henry H. Howell, Mike W. Jones, Robert A. Kuehne Feb 1976

Some Of The Effects Of Domestic Sewage Discharged Into Hickman And Jessamine Creeks In Jessamine County, Kentucky, Henry H. Howell, Mike W. Jones, Robert A. Kuehne

KWRRI Research Reports

A 6-week study was made in the summer of 1971 as an initial effort to determine the extent of pollution that the three sewage disposal plants in Jessamine County, Kentucky, are contributing to its streams. With the rapid population increase in Lexington and nearby municipalities, this study should furnish a basis of comparison for future investigations. Eighteen collecting stations were established in riffle areas of Hickman and Jessamine Creeks, and coliform bacteria, macro-invertebrate populations, fish populations and chemical water quality of each riffle area were studied.

Hickman Creek's flow was augmented by approximately 3,100,000 gallons/day (11,735 -m3/day) from …


Water Current, Volume 8, No. 1, January/February 1976 Jan 1976

Water Current, Volume 8, No. 1, January/February 1976

Water Current Newsletter

Evolving Groundwater Management Policies
Water Resources Seminars
1976 Water Conference
Water Research in Nebraska
OWRT Seeks Applications for One-Year Appointment as Research Scholar
Nonpoint Sources Causing Water Quality Problems
Research Review: Mapping Model for Determining Land Suitable for Irrigation


Dickey-Lincoln School Lakes, Maine, U.S.A. And Quebec, Canada: Design Memorandum No. 3: Hydropower Capacity And Project Economic, New England Division, United States Army Corps Of Engineers Jan 1976

Dickey-Lincoln School Lakes, Maine, U.S.A. And Quebec, Canada: Design Memorandum No. 3: Hydropower Capacity And Project Economic, New England Division, United States Army Corps Of Engineers

Dickey-Lincoln School Lakes Project

This design memorandum presents the results of current engineering and economic analyses which serve as the basis for the selection of the recommended hydro-power installation at the Dickey-Lincoln School Lakes project. The report includes a summary of data pertinent to hydropower features of the project, projections of electricity needs for the New England Power Supply Areas, a description of the recom-mended power plan and facilities, pertinent data associated with power regulation studies, and the economic and engineering rationale for capacity optimization.


Transmission Planning Summary : Dickey-Lincoln School Lakes Project Transmission Studies, United States Department Of Interior Jan 1976

Transmission Planning Summary : Dickey-Lincoln School Lakes Project Transmission Studies, United States Department Of Interior

Dickey-Lincoln School Lakes Project

This report summarizes the results of system planning, environmental, and location studies for transmission facilities associated with the proposed Dickey-Lincoln School Lakes Project in northern Maine. The studies recommend the construction of two 345-kV transmission circuits from a substation near the project along a route through western Maine into northern New Hampshire and Vermont. The plan will integrate the power produced by the project into the New England Power Pool Transmission System. Five alternate integration plans were identified and studied. Of the five plans, the recommended plan, which calls for the lines to be suspended from a single row of …


1976 Sunflower-Safflower Irrigated Variety Trial 1976-1977, G J. Parlevliet Jan 1976

1976 Sunflower-Safflower Irrigated Variety Trial 1976-1977, G J. Parlevliet

Experimental Summaries - Plant Research

In 1975/76 two varieties of sunflower, Hysun 10 and Hysun 20, as well as Safflower (Gila) were grown in a large alternative crop demonstration. Results were sufficiently good to warrant more and closer examination. This led to the present variety trial using varieties suggested by Mr. M. Poole. The aim was to evaluate six sunflower varieties and one safflower. The work was carried out in the light of reduced profitability of peas, beans and some fruit crops. This results in a number of growers having irrigation water and equipment under-employed. Other farmers are after a crop which will give them …


Studies On Disinfection And Chemical Oxidation With Ozone And Chlorine In Water Reclamation, W. R. Ross, Johannes Van Leeuwen, W. O. K. Grabow Jan 1976

Studies On Disinfection And Chemical Oxidation With Ozone And Chlorine In Water Reclamation, W. R. Ross, Johannes Van Leeuwen, W. O. K. Grabow

Johannes van Leeuwen

Laboratory studies showed that Pseudomonas aeruginosa, Aeromonas hydrophila and Acinetobacter anitratum are more resistant to chlorine and ozone than Escherichia coli. Pseudomonas aeruginosa was the most resistant of all strains tested and was selected as test organism for pilot plant studies on the efficiencies of chlorine and ozone disinfection. The disinfectants proved equally efficient for the disinfection of chlorine demand-free water but ozone was much more efficient in the case of water with a chlorine demand. This difference was confirmed to be due to the property of chlorine to react with nitrogenous substances to form chloramines which are less efficient …


Appendices To An Aqueous Environmental Simulation Model For Mid-South Lakes And Reservoirs, Louis J. Thibodeaux Jan 1976

Appendices To An Aqueous Environmental Simulation Model For Mid-South Lakes And Reservoirs, Louis J. Thibodeaux

Technical Reports

The program simulates some of the major physical, chemical and biological processes occuring within the aqueous phase of lakes and reservoirs. The program was developed to study the eutrophic development of these water bodies.


Sealing Farm Dams, I A F Laing, R. G. Pepper Jan 1976

Sealing Farm Dams, I A F Laing, R. G. Pepper

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

Research over the past 10 years has shown that it is technically possible to seal many leaking farm dams. In some situations a cheap chemical treatment is effective but in most cases it is cheaper to construct a replacement dam.

This article reviews the situation in western Australia and outlines some of the methods used for sealing dams.


The Fishes Of Washinton County, Arkansas, Donald G. Cloutman, Larry L. Olmsted Jan 1976

The Fishes Of Washinton County, Arkansas, Donald G. Cloutman, Larry L. Olmsted

Technical Reports

No abstract provided.


Supply And Demand In Water Planning: Streamflow Estimation And Conservational Water Pricing, D. I. Carey, C. T. Haan Jan 1976

Supply And Demand In Water Planning: Streamflow Estimation And Conservational Water Pricing, D. I. Carey, C. T. Haan

KWRRI Research Reports

Recent studies indicated the need for development of surface water supplies in Kentucky. Rising resource costs make economically efficient reservoir designs increasingly important. This study was undertaken to provide methods in water supply reservoir design that increase system benefits.

Two major factors influencing reservoir design were studied: estimated future streamflow into the reservoir and demands placed on the reservoir. Standard reservoir sizing methods rely on historical streamflow data. This data is frequently limited and uncertainty in required storage estimates may result. To assess the reliability of a design, the use of mathematical models in simulation studies was proposed. Existing stochastic …


Sensitivity Of Vertebrate Embryos To Heavy Metals As A Criterion Of Water Quality: Phase Iii: Use Of Fish And Amphibian Eggs As Bioindicator Organisms For Evaluating Water Quality, Wesley J. Birge, Albert G. Westerman, Jeffrey A. Black Jan 1976

Sensitivity Of Vertebrate Embryos To Heavy Metals As A Criterion Of Water Quality: Phase Iii: Use Of Fish And Amphibian Eggs As Bioindicator Organisms For Evaluating Water Quality, Wesley J. Birge, Albert G. Westerman, Jeffrey A. Black

KWRRI Research Reports

Fish and amphibian eggs, embryos and early posthatched (larval) stages were evaluated as bioindicator organisms with which to monitor the quality of natural water resources. Eggs of 9 species were cultured in water collected from each of 11 Inner Bluegrass rivers and streams. The latter were chosen to represent water sources varying in quality from extremely poor to good. Selection was based on the sources and magnitude of pollution, and the diversity and density of piscine populations. Cultures were maintained in vitro, using 12-hour changes of water.

Averaging data for all 9 animal species, egg hatchability (embryonic survival) ranged …


Biological Inventory Of The Southern Nevada Water Project, Second Stage, W. Glen Bradley, J. Scott Miller Jan 1976

Biological Inventory Of The Southern Nevada Water Project, Second Stage, W. Glen Bradley, J. Scott Miller

Publications (WR)

The present report is a biological inventory of the Southern Nevada Water Project, Second Stage. The boundaries of the project encompass sections of North Las Vegas, Las Vegas, East Las Vegas and areas along Las Vegas Wash extending to its drainage point in Las Vegas Bay in Lake Mead. Therefore, it encompasses a wide array of ecological situations and landscapes ranging from essentially natural to various stages of urban development.

This biological inventory presents basic ecological classifications, descriptions of vegetation, lists of vascular plants and vertebrates known to occur in the area. Each major group, i.e., plants, fish, amphibians, reptiles, …


An Evaluation Of The Effects Of Dredging Within The Arkansas River Navigation System, Volume Iii-The Effects Upon The Zooplankton Associations, Edgar D. Short, Eugene H. Schmitz Jan 1976

An Evaluation Of The Effects Of Dredging Within The Arkansas River Navigation System, Volume Iii-The Effects Upon The Zooplankton Associations, Edgar D. Short, Eugene H. Schmitz

Technical Reports

The primary purpose of the zooplankton phase of the coordinated study was to attempt to evaluate the effects of dredging operations on the abundance, distribution, composition and complexity of the zooplankton communities within the aquatic system of the Arkansas River. The other phases of investigation include fish, macroinvertebrates, phytoplankton and some physico-chemical parameters. The lack of baseline data, needed for measurement of previous ecological conditions from which to detect past and future changes, proved to be a major impediment to any evaluation. Although the study involved only about 240 miles of the river in Arkansas, it should serve as an …


Bear River Basin Environmental Assessment Projections: Summary Report, Wyoming Water Planning Program Jan 1976

Bear River Basin Environmental Assessment Projections: Summary Report, Wyoming Water Planning Program

Elusive Documents

No abstract provided.


Laboratory Apparatus For Providing Diel Temperature Regimes For Aquatic Animals, Wayne A. Wurtsbaugh, G. Davis Jan 1976

Laboratory Apparatus For Providing Diel Temperature Regimes For Aquatic Animals, Wayne A. Wurtsbaugh, G. Davis

Watershed Sciences Faculty Publications

In studies of the effects of elevated temperature on aquatic organisms, little emphasis has been placed on modeling the fluctuating temperatures to which organisms are exposed in nature. To some extent this may be related to problems of design and maintenance of apparatus for fluctuating temperature control. The complexity of apparatus used to provide cycled temperatures has ranged from manually controlled valves for introducing water of different temperatures into aquariums (Kelso 1972), to a complex and expensive feedback system, regulated by rotating cams, that controls the temperature of influent water (Honeywell Cam Programmer Thermometers, Fort Washington, Pennsylvania). To facilitate studies …


An Empirical Analysis Of Predictors Of Income Distribution Effects Of Water Quality Controls, John E. Keith, Ming C. Chen, Don C. Reading, Robert Johnson Jan 1976

An Empirical Analysis Of Predictors Of Income Distribution Effects Of Water Quality Controls, John E. Keith, Ming C. Chen, Don C. Reading, Robert Johnson

Reports

No abstract provided.


Capability Of Integer Programming Algorithms In Solving Water Resource Planning Problems, Trevor C. Hughes, William J. Grenney, A. Bruce Bishop, Calvin G. Clyde, Rangesan Narayanan, Paul E. Pugner Jan 1976

Capability Of Integer Programming Algorithms In Solving Water Resource Planning Problems, Trevor C. Hughes, William J. Grenney, A. Bruce Bishop, Calvin G. Clyde, Rangesan Narayanan, Paul E. Pugner

Reports

The feasibility of optimizing large regional water resource planning problems by means of integer programming algorithms is analyzed. Two types of integer programming models are developed: (1) A water supply model including 23 separate but geographically related community systems; and (2) a river basin water quality model including 15 point sources of wastewater, 4 types of pollutants, 6 surveillance points, and 7 alternative treatment processes. The water supply model was structured as a mixed integer problem (some continuous variables included) while the water quality model was an all integer problem. Four integer programming algorithms were tested on the sample problems …


User Oriented Systems Analysis For Regional Municipal Water Supply Planning, Paul E. Pugner, Trevor C. Hughes Jan 1976

User Oriented Systems Analysis For Regional Municipal Water Supply Planning, Paul E. Pugner, Trevor C. Hughes

Reports

No abstract provided.


Iron Dynamics In A Gas-Water-Sediment Microcosm, Peter A. Cowan, V. Dean Adams, Donald B. Porcella Jan 1976

Iron Dynamics In A Gas-Water-Sediment Microcosm, Peter A. Cowan, V. Dean Adams, Donald B. Porcella

Reports

Iron dynamics in eutrophic systems were studied in the laboratory utilizing gas-water-Sediment phase sealed microcosms. Sediments from Hyrum Reservoir (2.4 percent iron by weight) were placed in the dark to simulate the hypolimnetic regions of a eutrophic impoundment. Iron both chemically and physically was readily available to microorganisms of the aqueous phase because iron in these systems was soluble. In the light microcosms, which simulated shallow littoral regions of eutrophic impoundments, iron was found in higher aqueous phase concentrations than was predicted chemically and physically; this was rationalized through biological mechanisms. The experiment was conducted in two phases: Phase I …


Nitrogen Cycling In Microcosms And Application To The Biology Of The Northern Arm Of The Great Salt Lake, John C. Stube, Frederick J. Post, Donald B. Porcella Jan 1976

Nitrogen Cycling In Microcosms And Application To The Biology Of The Northern Arm Of The Great Salt Lake, John C. Stube, Frederick J. Post, Donald B. Porcella

Reports

No abstract provided.


Evaluation Of The Addition Of Granular Media Filtration To Wastewater Treatment Plants To Meet New Standards, Madhusudan M. Dawda, M. L. Davidson, E. J. Middlebrooks Jan 1976

Evaluation Of The Addition Of Granular Media Filtration To Wastewater Treatment Plants To Meet New Standards, Madhusudan M. Dawda, M. L. Davidson, E. J. Middlebrooks

Reports

A dual media filtration study was carried out at the central Weber Wastewater Treatment Plant in Ogden, Utah, to evaluate its feasibility as a tertiary treatment to meet new effluent quality standards. A review of the literature indicated that dual media filters were more efficient than conventional single media sand filters because of the “in depth” filtration achieved by dual media filters. An experimental filter was operated at four different hydraulic loading rates, ranging from 3 to 6 gpm/ft 2 (122.10 to 244.20 1/min/m2), to evaluate its effects on effluent quality. Hydraulic loading rate was shown not to affect suspended …


Disposal Alternatives For Intermittent Sand Filter Scrapings Utilization And Sand Recovery, Jerry T. Elliott, Daniel S. Filip, James H. Reynolds Jan 1976

Disposal Alternatives For Intermittent Sand Filter Scrapings Utilization And Sand Recovery, Jerry T. Elliott, Daniel S. Filip, James H. Reynolds

Reports

A three phase study is used to develop disposal alternatives and cost analysis for algae laden sand scrapings removed from intermittent sand filters used to polish wastewater lagoon effluent. Phase I, Irrigation Technique, explores the feasibility of supplying sufficient water to sand scrapings to leach out entrapped material. Details of removal with amount of water applied are presented. Phase II, Soil Application, tests with lysimeters soil response to application of the algae laden sand material. Physical and chemical parameters are not markedly altered where algae laden sand is applied to the soil surface. Phase III, Plant Bioassays, grew tall fescue …


Hydrologic Impact Of Burning And Grazing On A Chained Pinyon-Juniper Site In Southeastern Utah, Gerald F. Gifford, John C. Buckhouse, Frank E. Busby Jan 1976

Hydrologic Impact Of Burning And Grazing On A Chained Pinyon-Juniper Site In Southeastern Utah, Gerald F. Gifford, John C. Buckhouse, Frank E. Busby

Reports

No abstract provided.


Colorado River Basin Modeling Studies: Proceedings Of A Seminar Held At Utah State University Logan , Utah July 16-18, 1975, Calvin G. Clyde, Donna H. Falkenborg, J. Paul Riley Jan 1976

Colorado River Basin Modeling Studies: Proceedings Of A Seminar Held At Utah State University Logan , Utah July 16-18, 1975, Calvin G. Clyde, Donna H. Falkenborg, J. Paul Riley

Reports

Preface: Computer modeling is an important and valuable tool for water resources planning and management. In recent years many different modeling approaches and techniques have been developed. Some have been applied in the Colorado River Basin. A brief and incomplete search showed over fifty reports on modeling in the Colorado River Basin alone. The main motivation for this Seminar was the indication that (1) much duplication of effort is occuring among Colorado River modeling studies due to lack of information and (2) much of the knowledge now available on modeling is not being effectively applied to real problems. The overall …


An Evaluation Of The Effects Of Dredging Within The Arkansas River Navigation System: Volume I - Introduction, Summary And Conclusions, And Recommendations, Myra Mcnutt, T. M. Buchanan, L. R. Kraemer, R. L. Meyer, E. H. Schmitz Jan 1976

An Evaluation Of The Effects Of Dredging Within The Arkansas River Navigation System: Volume I - Introduction, Summary And Conclusions, And Recommendations, Myra Mcnutt, T. M. Buchanan, L. R. Kraemer, R. L. Meyer, E. H. Schmitz

Technical Reports

The Arkansas River originates in the eastern slopes of the Rocky Mountains near Leadville, Colorado, and extends through Kansas, Oklahoma, and Arkansas, where it flows into the Mississippi River. The Arkansas River is approximately 1,450 miles in length and drains a total area of 160,500 square miles. The river and its tributaries have been developed for navigation, flood control, and hydro-electric power, as well as recreational purposes under the River and Harbor Act of July 24, 1946. The development of the Arkansas River for recreational use will be completed in the near future. The McClellan-Kerr Arkansas River Navigation System was …


An Evaluation Of The Effects Of Dredging Within The Arkansas River Navigation System - Volume Ii - Effects Upon The Phytoplankton Associations, Myra Mcnutt, Richard L. Meyer Jan 1976

An Evaluation Of The Effects Of Dredging Within The Arkansas River Navigation System - Volume Ii - Effects Upon The Phytoplankton Associations, Myra Mcnutt, Richard L. Meyer

Technical Reports

Phytoplankton are a major source of primary production in aquatic ecosystems and constitute one of the most important assemblages of the biotic community. These organisms are the basic level of the trophic pyramid upon which other organisms are dependent. The development, maintenance, and environmental influence of phytoplankton in and on the aquatic ecosystem has been a subject of interest and concern for many years. Most of the studies concerning the nature and distribution of phytoplankton have been confined to lacustrine systems. Hutchinson (1967), citing several lake studies, sutmarized various aspects of the physical and chemical factors associated with phytoplankton. These …


Salt Encroachment : The 1974 Saltland Survey, C V. Malcolm, R. C. Stoneman Jan 1976

Salt Encroachment : The 1974 Saltland Survey, C V. Malcolm, R. C. Stoneman

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

It has long been recognised that the clearing of land for agriculture in the south western Australia is followed by the development of saline soils and streams.

In 1955 and again in 1962, in conjunction with the annual statistical returns, farmers in Western Australia were asked to supply estimates of salt-affected land on their properties.

In 1974 a further survey was conducted, in co-operation with the Australian Bureau of Statistics, using questions covering only the basic information. As the information is again available on a Shire basis a direct comparison can be made with the 1962 survey except for some …