Sister Grove Creek Water Quality Modeling – TPDES Permitting Support


North Texas Municipal Water District (NTMWD)


Collin County, TX


Water Quality Modeling


Stream Modeling

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To support permitting of a discharge of treated wastewater effluent from a new regional wastewater treatment plant, Plummer assisted the NTMWD in developing a plan for collecting field measurements of stream geometry and flowrates and developed a QUAL-TX model based on the collected data. Plummer customized site-specific model hydraulic coefficients for Stiff Creek and Sister Grove Creek by fitting curves to the velocity-flowrate and depth-flowrate relationships obtained from the field data. Plummer used the model to identify discharge flowrates and water quality that are projected to maintain the Texas Surface Water Quality Standards in the receiving water. Finally, Plummer wrote a modeling technical memorandum that was submitted as part of the TPDES permit application, answered TCEQ questions about the model, and assisted NTMWD in obtaining the discharge permit.

Field Measurement of Stream Geometry
Field Measurement of Stream Geometry


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Stream Water Quality Modeling – TPDES Permitting Support

To support permitting of a discharge of treated wastewater effluent from a new wastewater treatment plant, Plummer developed a QUAL-TX model from HEC-RAS cross-sections of the receiving stream.

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