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Stream Water Quality Modeling – TPDES Permitting Support


Confidential Client



Water Quality Modeling


Stream Modeling

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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. Plummer customized site-specific model hydraulic coefficients for the stream by fitting curves to the velocity-flowrate and depth-flowrate relationships obtained from the HEC-RAS model. Plummer used the model to identify discharge flowrates and effluent quality limits that are projected to maintain the Texas Surface Water Quality Standards in the receiving water. Plummer wrote a modeling technical memorandum that was submitted as part of the TPDES permit application, answered TCEQ questions about the model, and assisted the client in gaining approval of the model from TCEQ modeling staff.


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.

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.

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.

Waste Load Allocation Model

Plummer updated the TCEQ’s regulatory model for the Upper Trinity River to a newer version and incorporated revised background flows.

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