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Waste Load Allocation Model


Upper Trinity Water Quality Compact


Dallas-Fort Worth Metroplex, TX


Water Quality Modeling


Stream Modeling

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Plummer updated the TCEQ’s regulatory model for the Upper Trinity River to a newer version and incorporated revised background flows. The model has been accepted by the TCEQ and will be used in evaluating permit limits for wastewater treatment plants of Compact members, which include every major wastewater treatment facility in the Dallas-Fort Worth Metroplex (totaling up to 767 MGD in permitted flow).

Dissolved Oxygen Profiles Predicted by Upper Trinity River Waste Load Allocation Model
Dissolved Oxygen Profiles Predicted by Upper Trinity River Waste Load Allocation Model


Coupling of SWAT and CE-QUAL-W2 Models

NTMWD sought to model nutrient loading from the Lavon Lake watershed and its impacts on water quality in Lavon Lake by coupling a SWAT model of the watershed with a CE-QUAL-W2 model of the lake.

Lavon Lake Water Quality Modeling – TPDES Permitting Support

Plummer developed a CE-QUAL-W2 model of Lavon Lake to evaluate impacts on dissolved oxygen, nutrients and chlorophyll-a levels in the lake.

Sister Grove Creek Water Quality Modeling – TPDES Permitting Support

To support permitting of a discharge of treated wastewater effluent from a new regional wastewater treatment plant, Plummer assisted the NTMWD in developing a QUAL-TX model and a plan for collecting field measurements of stream geometry and flowrates.

Nutrient Study

As regulatory limits on nutrients and algae become an increasing reality in Texas, it is imperative that a reliable and site-specific approach be developed for establishing Texas Pollutant Discharge Elimination System (TPDES) permit effluent quality limits for nutrients.

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