Digital Commons Network^™

Conceptualization And Early Development Of A Water Response Ecosystem Model, D. C. Wilkin, P. W. Lommen, J. V. Robinson, G. S. Innis

Progress reports

No abstract provided.

Data Search For Aquatic Model, J. Perry Ii, G. W. Minshall

Progress reports

No abstract provided.

Further Development Of A Stream Ecosystem Model, J. H. Wlosinski, G. W. Minshall

Progress reports

No abstract provided.

Physiological And Biochemical Studies Of Nitrogen Fixation In The Nodules Of Sagebrush (Artemisia Ludoviciana) And Other Desert Nitrogen-Fixing Systems, R. B. Farnsworth

Progress reports

No abstract provided.

Studies On Wood Borers, Girdlers And Seed Predators Of Mesquite, W. G. Whiteford, R. K. Johnson, D. J. Depree

Progress reports

No abstract provided.

Nitrogen Retention In Cool Desert Soil, J. Skujins

Progress reports

No abstract provided.

Plant Response To Insect Herbivory, B. E. Norton, L. B. Smith

Progress reports

No abstract provided.

Factors Affecting Seed Reserves In The Soil Of A Desert Ecosystem, R. M. Chew, J. F. Nelson

Progress reports

No abstract provided.

Influence Of Digging Rodents On Primary Production In Rock Valley, L. Soholt, M. R Griffin, L. Byers

Progress reports

No abstract provided.

Plant Response To Insect Herbivory, B. E. Norton, L. B. Smith

Progress reports

No abstract provided.

Water Quality 1973 - 1974 Hillsborough County, Florida, T. Cardinale, C. Dunn, R. Powell, A. Shaw, R. Wilkins

Reports

The Hillsborough County Environmental Protection Act charges the Environmental Protection Commission with the function of establishing, operating and maintaining a continuous program for monitoring water pollution. A county-wide water quality surveillance network has been designed to provide accurate data and information as to whether the requirements of the Act are being complied with and whether the level of water pollution is increasing or decreasing throughout the county.

Comparison of this 1973 and 1974 data with similar sampling during 1972 permitted evaluation of trends, effectiveness of local control programs, relative contributions from individual sources, general effectiveness of the monitoring network, as …

Extracts From The Department Of Agriculture's Annual Report, 1974-75, Department Of Agriculture, Western Australia

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

The Department of Agriculture's Annual Report for the year ended June 30, 1975, took the form of short reviews of selected activities of the Department during the year.

Some of these reviews are reprinted below to give an idea of the range of activities undertaken by the Department. A limited number of copies of the full report are available to interested organisations from the Department of Agriculture, Jarrah Road, South Perth, 6151.

In past years the Department's report has taken the form of a relatively detailed technical summary of the work of each Division. Because of the large volume of …

Food Habits Of Young-Of-The-Year Fishes In Abbey Pond, South Dakota, Randall D. Radant

Electronic Theses and Dissertations

Food habits of young-of-the-year largemouth bass (Micropterus salmoides), bluegill (Lepomis macrochirus), black crappie (Pomoxis nigromaculatus), yellow bullhead (Ictalurus natalis), and yellow perch (Perca flavescens) were studied during 1973 and 1974 in Abbey Pond, South Dakota. Organisms found in young-of-the-year fish stomachs and in plankton samples were identified and counted in the laboratory. Zooplankton, aquatic insects and fish were the most important food organisms consumed by young fishes. Using Ivlev’s electivity index food electivity by the fishes for zooplankton was calculated. The size-specific food habits of young-of-the-year largemouth bass progressed from entomostracans to aquatic insects to fish. In most cases zooplanktons …

Process Control Of Activated Sludge Treatment, Phase Ii, Richard I. Kermode, Robert W. J. Brett, Joseph D. Pault Jr.

KWRRI Research Reports

Material balances on substrate and microorganisms were derived in conjunction with various mixing configurations thought to accurately describe the activated sludge process. These models include the completely mixed with bypass, plug flow, and plug flow with bypass. Two sets of kinetic mechanisms for substrate utilization and bacterial growth were employed.

A feed forward controller was designed from linear approximations of the material balances derived in the completely mixed with bypass mixing model. Utilizing frequency response methods, the controller was found essentially identical to a completely mixed modeled controller developed in a prior investigation.

Through computer simulation the controller's effectiveness was …

Food Habits, Growth, And Production Of Young-Of-The-Year Walleyes, Stizostedion Vitreum Vitreum (Mitchell), In A South Dakota Pond, Ronne E. Walker

Electronic Theses and Dissertations

A 12.45 hectare South Dakota pond was stocked with 25,000 walleye, Stizostedion vitreum vitreum (Mitichell), fingerling on 13 June, 1973. Walleyes were monitored for growth rate and food habits until 13 September, 1973. Walleyes were removed from the pond using various methods in order to evaluate the efficiency of removal methods. The average total length and average weight of walleyes in the pond increased from 43.5 mm and 0.50 g on 13 June to 167.1 mm and 41.25 g on 13 September. This was a gain of 123. 6 mm and 40.75 g or an average daily increase of 1.34 …

A Field Technique Measuring Virus Decay And Potential Aerosol Hazard From Wastewater Sprinkler Irrigation, Michael F. Torpy, Robert A. Gearheart, J. Clifton Spendlove, Rex S. Spendlove

Reports

The increased use of domestic wastewater for irrigation purposes has stimulated a growing practice of sprinkler irrigating from oxidation ponds and other domestic wastewaters. Aerosols generated from these sprinkler irrigation systems may contain potentially hazardous pathogens. Subsequently, the aerosols can contain infective viruses which can be carried through the air to surrounding populations. Thus, a public health hazard can be created by sprinkler irrigating domestic wastewater. This study is an investigation of a means by which the virus decay rate of viruses in aerosols and the potentials hazard of sprinkler irrigation aerosol clouds may be examined. A means of injection …

Development Of A Management Framework Of The Great Salt Lake, J. Paul Riley, Calvin G. Clyde, William J. Grenney, Yacov Y. Haimes, Craig T. Jones

Reports

No abstract provided.

Nutrient Dynamics And Gas Production In Aquatic Ecosystems: The Effects And Utilization Of Mercury And Nitrogen In Sediment-Water Microcosms, D. B. Porcella, V. D. Adams, P. A. Cowan, S. Austrheim-Smith, W F. Holmes, J. Hill Iv, W. J. Grenney, E. J. Middlebrooks

Reports

Sixteen sediment-water microcosms designed to allow complete gas, liquid, and solid mass balances of gases, nutrients, and mercury were studies under dark conditions or varying light intensity for a period of 189 days. Results indicated that the microcosm technique is a very sensitive method of analyzing microbial dynamics in sediment water systems. Gas quantity and composition changes were easy to monitor and were especially sensitive to light and nutrient variations. Nitrogen fixation occurred in all lighted systems (blue-green algae nitrogen fixers, Anabaena, and others) and was adequate to insure that no nitrogen limitation occurred even though nitrogen limitation was imposed …

Biostimulation And Nutrient Assessment, Thomas E. Mahoney, A. G. Payne, C. M. Weiss, W. E. Miller, J. C. Greene, T. Shiroyama, R. A. Soltero, A. F. Gasperino, D. T. Specht, R. M. Gerhold, P. D. Uttormark, J. P. Wall, J. H. Reynolds, E. J. Middlebrooks

Reports

No abstract provided.

Colorado River Regional Assessment Study Part One: Executive Summary, Basin Profile, And Report Digest, Utah Water Research Laboratory

Reports

No abstract provided.

Colorado River Regional Assessment Study Part Two: Detailed Analyses: Narrative Description, Data, Methodology, And Documentation, Utah Water Research Laboratory

Reports

No abstract provided.

Modeling Phytoplankton Blooms In A Stratified Embayment, William J. Grenney

Reports

A mathematical model was developed to simulate the nitrogen limited growth dynamics of phytoplankton in a stratefied embayment. The representation of biological growth dynamics includes consideration of intracellular nutrient storage as well as the effects of temperature and light intensity. Several competing species can be represented simultaneously. Model hydrodynamics represent the effects of vertical mixing in the water column on the physical distribution of nutrients and phytoplankton. Sinking velocities of the cells are also included. The model was applied to Auke Bay, Alaska, and model responses are compared to data observed during the spring and summer of 1967.

Naturally Occurring Organic Compounds And Algal Growth In A Eutrophic Lake, V. Dean Adams, Russell R. Renk, Peter A. Cowan, Donald B. Porcella

Reports

No abstract provided.

Watershed Management On Range And Forest Lands Proceedings Of The Fifth Workshop Of The United States/Australia Rangelands Panel, R. J. Mcconnen, B. S. Sadler, Colin L. Pierrehumbert, Kenneth G. Renard, Donald L. Brakensiek, Alden R. Hibbert, T. Talsma, C. W. Rose, Ronald E. Sosebee, Richard Meeuwig, Paul Packer, Walter C. Boughton, J. Paul Riley, Richard H. Hawkins

Reports

Preface: The U.S.-Australia Cooperative Rangeland Science Program In October 1968 the governments of the United States and Australia entered into an agreement for the purpose of facilitating close cooperative activities between the scientific communities of the two countries. The joint communique issued at that time designated the U.S. National Science Foundation and the Australian Commonwealth Department of Education and Science as the coordinating agencies. Both countries were to encourage binational teamwork in research, interchanges of scientists, joint seminars, and exchanges of information. A United States-Australia Rangeland Panel was established in December 1969 to further cooperation between the two countries in …

Raising Wood Ducks, Richard L. Nelson

Nebraska Game and Parks Commission: Publications

Numbered among Nature's most colorful creatures, wood ducks willingly accept a helping hand from man in establishing new homes. These birds adapt well to suitable habitat, and you can play an important part in bringing the wood duck to locations where they do not now nest. For groups or individuals who are willing to expend the effort necessary to undertake a wood duck restoration project anti see it to completion, it is an exceptional gift from today's generation to those of decades and centuries to come. Many areas in Nebraska provide suitable wood duck habitat, but do not have a …

Water Current, Volume 7, No. 1, January 1975

Water Current Newsletter

From the Desk of the Director
Conference Held on Research in Action
NWRRI Research Seminar
Nebraska First in NPDES Program
Resignations and Retirements from OWRT
Future Water Crisis Noted
Horton Outlines Federal Water Policy
Research Review: Seasonsal Water Use of Irrigated Pasture Grasses Under Permanent-Set Irrigation as Related to Climatic Factors

Effect Of Feedlots On Water Quality, Ronald D. Cheetham, Alan J. Holmes, David Borresen

Journal of the Minnesota Academy of Science

The effect of feedlot runoff on water quality was examined. Samples were collected from river feedlots and offshore from lake feedlots and compared with samples from appropriate control sites. Bacterial contamination, as measured by the total coliform test over two successive summers, exhibited significant variation between feedlot and control sites. Coliform levels at lake sites adjacent to feedlots were double the levels at control sites; while in river systems average coliform levels downstream from feedlots were approximately 17 times the upstream controls.

Mixing Effects On Shallow Water Bodies, Kim Robin Powell

Retrospective Theses and Dissertations

This report is intended to examine the ecological changes due to mixing in shallow water bodies. Physical, chemical, and biological changes are reported in literature. A literature search revealed the range of mixing nodes or processes. Assessment of ecological changes due to mixing by boating activities had been evaluated in a research project supported by the environmental Protection Agency and conducted at Florida Technological University. The examination of changes due to mechanical mixing on lake ecology simulated in fifty-five gallon drums indicated the sensitivity of such parameters as total Kjeldahl nitrogen, conductivity, pH, temperature, and dissolved oxygen. Problems of reproducibility …

Plating Wastewater Management, Earl Kenneth Ossorio

Retrospective Theses and Dissertations

A study was made of existing methods of management, treatment and disposal of water and wastewater effluents at a large aerospace facility (Martin Marietta Aerospace) in Central Florida. Water consumption and handling were evaluated, with emphasis being placed on the handling of plating wastes, since they are the main contributor of industrial wastewater pollutants at the facility. The flow, storage, and treatment of the plating wastes were studied. Literature concerning plating wastes was surveyed to determine the latest "state of the art" on handling of plating pollutants. Then, the "state of the art" processes were compared with the existing processes …

Colorado River Regional Assessment Study Part Three: Area-Specific Water Quality Analysis And Environmental Assessment, Utah Water Research Laboratory

Reports

The Colorado River Bain contains the most diverse environment setting of any American river. High mountainous elevations (>14,000 feet) are ultimately succeeded by sea level plains and low valleys. Geological structures and formations include deep, intricately carved river canyons, high mountain slopes, large saline shale structures, and long verdant irrigated river valleys. Fir forests are succeeded by arid rangelands. The river produces the lowest outflow per unit area (60 acre feet per square mile) of any river basin in the United States. It contains the largest number of unique and endangered species in the United States. Finally, it is …