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Lavon Lake Water Quality Modeling – Total Dissolved Solids


North Texas Municipal Water District (NTMWD)


Collin County, TX


Water Quality Modeling


Reservoir Modeling

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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. Plummer characterized the total dissolved solids (TDS) of all NTMWD water supply sources and tracked the volume and projected TDS concentration of the water supplied to each NTMWD customer from the source(s), through the water treatment plant(s), through the wastewater treatment plant(s), and back to Lavon Lake. Plummer used this model to project TDS concentrations at key locations for:

  • Baseline operations
  • Baseline operations with seasonal pumping of water from Lake Texoma to Lavon Lake
  • Addition of a Leonard Water Treatment Plant (WTP) that uses blended water from Lake Texoma and the future Bois D’Arc Lake
  • Addition of a Leonard WTP that uses desalination instead of blending

Plummer also evaluated the impact of different blends of Lake Texoma and Lavon Lake water at the Wylie WTP.

Total Dissolved Solids Model Schematic for NTMWD
Total Dissolved Solids Model Schematic for NTMWD

Plummer later modified the model to also project likely worst-case TDS concentrations in the water imported from Lake Texoma and potential short-term impacts to drinking water quality. Based on up-to-date concentrations, Plummer provided weekly forecasts, which NTMWD used to determine whether to change the blend of Texoma and Lavon water at the Wylie Water Treatment Plant (WTP).


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.

Drought Response Feasibility and Engineering Study

The 2014 Austin Water Resource Task Force recommended that the City of Austin evaluate the feasibility of IPR in Lady Bird Lake (LBL) as one of several water supply strategies for consideration in the City’s integrated water resources plan.

Spill Response Planning and Spill Response App

A client operates an ongoing Watershed Protection Program (WPP) to protect its water supply. Plummer assisted in developing and incorporating a spill response plan into the WPP.

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.

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