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

• Main Author: Lytle, Lili Lisa
• Other Authors: Dickson, Kenneth L.
• Format: Others
• Language: English
• Published: University of North Texas 1999
• Subjects: Lake impoundment; Chlorophyll a; Lake Ray Roberts; Trophic status; Water quality > Texas > Ray Roberts Lake.; Water > Composition > Texas > Ray Roberts Lake.; Eutrophication > Texas > Ray Roberts Lake.; Ray Roberts Lake (Tex.)
• Online Access: https://digital.library.unt.edu/ark:/67531/metadc279143/

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.