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Dissolved Oxygen Model of Oso Bay


City of Corpus Christi


Corpus Christi, TX


Water Quality Modeling


Bay/Estuary Modeling

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Oso Bay is a complex shallow estuary system that is heavily impacted by tidal cycles, local aquatic flora and fauna, and large hypersaline water transfers that alter the Bay’s natural hydrologic regime.

The Sutter Wildlife Refuge in the Oso Bay Estuary
The Suter Wildlife Refuge in the Oso Bay Estuary

Plummer developed a dissolved oxygen model that couples the FREHD hydrodynamic code (Hodges, 2012) and EPA WASP 7 to simulate dissolved oxygen in the Bay. The model was calibrated and used to evaluate the impact of effluent discharge from the City of Corpus Christi’s wastewater treatment plants on the Bay health. The model has been approved by the TCEQ and adopted as a regulatory model to evaluate discharges into the Bay. Plummer provided model expertise to assist in the City’s discussions with the TCEQ and local environmental organizations (e.g., the Coastal Bays Bends and Estuary Program) regarding water quality standards in Oso Bay.

Segmentation and Bathymetry of the Oso Bay Dissolved Oxygen Model
Segmentation and Bathymetry of the Oso Bay Dissolved Oxygen Model


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.

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.

Dissolved Oxygen Model of Lewisville Lake

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.

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.

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