Upper Trinity Regional Water District (UTRWD)
Denton County, TX
Using the EPA’s Water Quality Assessment Simulation Program (WASP), Plummer developed an advanced water quality model of Lewisville Lake to support a TPDES permit renewal for the Lakeview Regional Water Reclamation Plant. The depth-averaged, 2-D model contained 10-acre computational cells and accounted for mixing and dispersion of the treated effluent discharge to the lake. Plummer used the model to identify discharge flowrates and effluent water quality limits that are projected to maintain the dissolved oxygen standard in Lewisville Lake. We wrote a modeling technical memorandum that was submitted as part of the TPDES permit application, answered TCEQ questions about the model, and assisted UTRWD in obtaining the discharge permit.
Plummer developed a monthly water balance model of Lavon Lake and the NTMWD water supply system to support evaluation of different water supply and water treatment management options.
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.
Plummer developed a CE-QUAL-W2 model of Lavon Lake to evaluate impacts on dissolved oxygen, nutrients and chlorophyll-a levels in the lake.
Plummer developed a dissolved oxygen model that couples the FREHD hydrodynamic code (Hodges, 2012) and EPA WASP 7 to simulate dissolved oxygen in Oso Bay.
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