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

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

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 means and were at the mesotrophic-eutrophic boundary of the OECD model. Six years after impoundment, observed MSE chlorophyll a for Main Body, was closer to its predicted mean and in the eutrophic category of the OECD model. Six years after impoundment, Elm Fork arm was the most productive area of Lake Ray Roberts. Observed means of chlorophyll a, total phosphates, suspended solids and turbidity were often highest in the Elm Fork arm. Wastewater effluent from Gainesville and Valley View, TX, had an impact on productivity in Elm Fork arm.
Date: May 1999
Creator: Lytle, Lili Lisa
Object Type: Thesis or Dissertation
System: The UNT Digital Library

Oral History Interview with Archie Gantt, August 31, 1999

Access: Use of this item is restricted to the UNT Community
Interview with Army veteran Archie Gantt. The interview includes Gantt's personal experiences about the European Theater during World War II, boyhood in central Texas, basic training, shipping to England, combat on the Siegfried Line, and the Battle of the Bulge. Additionally, Gantt talks about leadership problems, combat living conditions, Officer Candidate School and commissioning, and his postwar war service in Europe.
Date: August 31, 1999
Creator: Lane, Peter B. & Gantt, Archie
Object Type: Book
System: The UNT Digital Library
[TNRCC meeting with Texas Air Quality Coalition, January 25, 1999] transcript

[TNRCC meeting with Texas Air Quality Coalition, January 25, 1999]

Sound recording of a TNRCC (now Texas Commission on Environmental Quality) meeting with the Texas Air Quality Coalition in Gainesville, TX on January 25, 1999.
Date: January 25, 1999
Creator: Hays, Margaret Parx
Object Type: Sound
System: The UNT Digital Library