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A Comparison of Predicted and Actual Trophic Status of Lake Ray Roberts, Texas Based on Chlorophyll A

Description: Two years before impoundment, the trophic status of Lake Ray Roberts was predicted by applying the total phosphorus input into the Organization for Economic Cooperation and Development (OECD) eutrophication model. Predicted mean summer epilimnetic (MSE) chlorophyll a of Elm Fork arm, Isle duBois arm and Main Body were in the eutrophic category of the OECD model. Observed MSE chlorophyll a two years after impoundment of Elm Fork arm, Isle duBois and Main Body had not reached their predicted mean… more
Date: May 1999
Creator: Lytle, Lili Lisa
Item Type: Refine your search to only Thesis or Dissertation
open access

Electricity in Rural Areas of North Texas

Description: "This study shows three things: (1) a precedent for the expenditure of public funds to teach electricity in our public high schools has already been established by the school system in the larger school systems of Texas, (2) the rural families living on electrified farms in the North Texas area want instruction of this type given to the boys and girls in their communities, and (3) both the rural people and the professional people of the North Texas area believe that instruction dealing with the… more
Date: January 1949
Creator: Greathouse, Charles Simmons
Item Type: Refine your search to only Thesis or Dissertation
open access

Habitat Evaluation Procedures at Ray Roberts Lake: an Analysis of the Relationship with Ecological Indicators and a Study of Observer and Temporal Variability

Description: Habitat Evaluation Procedure data gathered at Ray Roberts Lake in 1989 and 1990 were analysed for temporal variability, observer variability and relationships between Habitat Units (HUs) and species density/diversity. observer variability within a group was analysed by cluster analysis and bootstrapping. Five out of 36 sites showed significant differences in Habitat Suitability Index (HSI) values within the group. A nonparametric Mann-Whitney test was used to analyze temporal variability. One o… more
Date: December 1993
Creator: Wattrus, Jane M. (Jane Marie)
Item Type: Refine your search to only Thesis or Dissertation
open access

How Healthy is the Upper Trinity River?: Biological and Water Quality Perspectives

Description: This conference report contains discussions and papers from a symposium hosted at Texas Christian University, in Fort Worth, Texas, examining the ecological health of the Upper Trinity River, and the impacts of various human activity, such as agriculture, urbanization, and waste management. The papers cover the effect of water quality on urban rivers, long-term water quality trends in the Trinity River, solutions that may improve water quality in the river, as well as biological, agricultural … more
Date: 1990
Creator: Jensen, Ric
Item Type: Refine your search to only Book
open access

Pre-Impoundment Estimations of Nutrient Loading to Ray Roberts Lake and Prediction of Post-Inundation Trophic Status

Description: Excessive nutrient loading of natural and artificial lakes has led, in some systems, to plethoric algal and aquatic macrophyte growth which can result in aesthetic degradation and undesirable tastes and odors. It would be advantageous to have some indication of the potential trophic status of a reservoir before it is filled. An objective of this study was to assess the water quality and nutrient loading potential of the tributaries entering Ray Roberts Lake, a large reservoir located in north c… more
Date: May 1988
Creator: Pillard, David Alan, 1958-
Item Type: Refine your search to only Thesis or Dissertation
open access

Responsibility of the Secondary School for the Social Development of its Students

Description: The problem in this study is twofold. First, there will be an attempt to determine the values that organizations in the secondary school have for the development of its students. Second, a survey will be made of the four-year accredited high schools in District Five of Texas to determine how and to what extent they are realizing their responsibilities in this respect.
Date: 1947
Creator: Baxter, Billie Otella
Item Type: Refine your search to only Thesis or Dissertation
open access

A Study of the Shopping Goods Trade Flow from Lewisville, Lake Dallas, Sanger, and Valley View, Texas

Description: "The purpose of the study is to determine the trading centers that receive significant amounts of shopping goods trade flow from the communities surveyed. The position that the Denton trading center holds as a source of shopping goods for households in these communities is compared with the postions held by some competing trading centers. This study is made in cooperation with the Denton Chamber of Commerce for the benefit of the merchants of Denton. It is based on a survey made in December 195… more
Date: August 1955
Creator: Robinson, David Charles
Item Type: Refine your search to only Thesis or Dissertation
open access

A Survey of Landowner Attitudes Toward the Construction of Lake Ray Roberts

Description: Documentation of social impacts resulting from the construction of Lake Ray Roberts is to be incorporated into a two year post-impoundment study. Research objectives are to: 1) locate current residences of landowners and previous landowners who were displaced; 2) determine social impacts resulting from construction of Lake Ray Roberts; 3) document degree of satisfaction with current living conditions; 4) document landowners' degree of satisfaction associated with COE negotiations; 5) document l… more
Date: August 1991
Creator: Norris, Paula Sue
Item Type: Refine your search to only Thesis or Dissertation
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