Dissolved Oxygen TMDL Development in Southern Georgia
Davie, Steven R.
Greenfield, James M.
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Dissolved Oxygen (DO) Total Maximum Daily Loads (TMDLs) were developed for 99 impaired stream segments in the southern Georgia 4 river basins include the Ochlockonee, Suwannee, Satilla, and St. Marys Rivers. The 4 river basins are characterized by low topographic relief, shallow blackwater streams, large organic loads from stream riparian areas, and extensive, low-lying floodplains and swamps. The DO concentrations typically fall well below Georgia's water, quality standard during the summer periods when precipitation and stream flow is at a minimum and water temperatures are high. The natural, organic load from detritus and leaf litter material in forest and wetland areas is a significant contributor to the low DO concentrations in most of the impaired segments. A watershed model was linked to an in-stream model to provide a framework for examining the sources of oxygen consumption in the impaired segments.