More than a decade of engineering, modeling, coordination, and planning is now taking shape in the field.
Our team recently visited construction of the Oyster Creek Diversion Channel and Detention Facilities project for the City of Sugar Land, where we had the opportunity to see one of the project’s most complex elements underway: the trenchless installation of dual 66-inch storm sewer lines beneath US 90A and the Union Pacific Railroad using guided auger boring. We were also joined by guests from the Fort Bend County Drainage District (FBCDD) and Harris County Flood Control District (HCFCD).
While the construction activity was impressive, the story behind this crossing began years earlier.
Starting With the Models
In 2015, our team piloted HEC-RAS 2D modeling to better understand Oyster Creek overflow and evaluate opportunities for a regional solution. As the project developed, the adoption of Atlas 14 rainfall criteria significantly increased the required improvements and roughly doubled the anticipated project cost.
That meant going back to the models, reevaluating the approach, and looking for ways to achieve the project’s goals while managing cost and constructability.
One of the biggest opportunities was the crossing at US 90A and the Union Pacific Railroad.
The more conventional approach would have required widening and deepening the existing channel beneath the TxDOT and timber railroad bridges. That would have meant work below the ordinary high water mark, significant structural modifications, and a more complicated permitting process.
Instead, the team developed a trenchless solution that routes additional stormwater conveyance beneath both transportation corridors.
The approach helped avoid approximately $8 million in construction costs and eliminated the need for a USACE Individual Permit.
Engineering Beyond the Design
Developing the solution was only one part of the challenge. The project required extensive coordination with TxDOT and Union Pacific Railroad, environmental permitting, constructability planning, and careful consideration of how the improvements would be constructed within an active transportation corridor.
The project also required securing funding through the Texas Water Development Board’s Flood Infrastructure Fund, ultimately receiving 100% financing for the approximately $19.9 million project at 0% interest.
That combination of engineering, funding, permitting, and agency coordination helped move the project from a complex regional need to a constructible solution.
A Significant Investment in Flood Protection
When complete, the Oyster Creek Diversion Channel and Detention Facilities project will include:
- More than 1.5 million cubic yards of excavation
- More than 1,100 acre-feet of detention
- Capacity to capture more than 850 cubic feet per second (cfs) of Oyster Creek overflow
The improvements will help provide additional flood protection for critical City facilities while supporting future development in the area.
For our team, seeing the project under construction was an opportunity to see more than just the work happening in the field. It was a chance to see how years of modeling, design decisions, coordination, and problem-solving come together in a real-world infrastructure project.
Projects like Oyster Creek are a reminder that major infrastructure solutions rarely come from one calculation or one idea. Modeling, technology, creativity, funding, permitting, agency coordination, and construction all have to work together.
After more than a decade of engineering and planning, it was rewarding to see those decisions taking shape in the field.
