TDR PRO Corrugated Polypropylene Pipe Whisper South Business Park, San Marcos, TX

Corrugated Polypropylene Pipe San Marcos — Whisper South, TX

TDR Pipe supplied TDR PRO® corrugated polypropylene pipe in San Marcos, Texas for the storm drainage system at Whisper South Business Park, a 45-acre industrial development on the I-35 corridor. TDR provided 18-inch through 60-inch pipe totaling 1,620 linear feet for this high-peak-flow commercial site.

Project overview

Whisper South Business Park is a multi-phase industrial development in San Marcos, Texas, strategically located along the I-35 corridor between Austin and San Antonio. Positioned midway between two of the fastest-growing metros in the country, the park draws logistics and manufacturing tenants who need dependable, all-weather site access. The 45-acre site includes warehouses, internal roadways, and large paved areas that generate high peak runoff during storms. Designed for Class-A industrial users, the project required a storm drainage system capable of supporting heavy truck traffic, high impervious cover, and long-term operational reliability.

The Challenge: Central Texas Peak Flows
The site is subject to intense Central Texas rainfall, where short-duration storms produce high peak flows. Drainage lines had to convey runoff from large roofs, truck courts, and roadways while performing under heavy live loads and accommodating potential differential settlement. Construction sequencing also required the storm system to be installed efficiently to stay ahead of paving and vertical construction—so speed of installation mattered as much as hydraulic capacity.

The TDR PRO® Corrugated Polypropylene Pipe Solution
TDR PRO® dual-wall polypropylene storm drain pipe, ranging from 18 to 60 inches in diameter, was selected to meet the project’s hydraulic, structural, and constructability requirements. The smooth interior wall provided high flow capacity without oversized pipe, while the corrugated exterior delivered stiffness and flexibility under load. Gasketed joints meeting ASTM and AASHTO standards ensured system integrity and long-term performance under heavy industrial traffic.

Installation and Benefits
Installed using open-trench methods with granular bedding, the lightweight TDR PRO® pipe allowed crews to install 30–40% more footage per day compared to rigid pipe. Longer pipe lengths reduced joint count and accelerated construction, keeping drainage work ahead of site development. For a phased build on a tight schedule, that installation speed directly protected the construction timeline. The system now provides reliable runoff control, corrosion resistance, and a high service life, while reducing installation costs and long-term ownership risk.

Results and Feedback
The project contractor noted faster installation rates and reduced equipment requirements, while engineers and owners valued the combination of hydraulic efficiency and durability. With runoff reliably controlled across the 45-acre site, the development is positioned for dependable long-term operation. The success of the Whisper South Business Park installation reinforced TDR PRO® as a preferred storm drainage solution for large-scale commercial developments in Central Texas.

About TDR PRO® Corrugated Polypropylene Pipe
TDR PRO® is a dual-wall corrugated polypropylene (PP) pipe engineered for gravity-flow stormwater drainage. It combines a smooth interior liner for hydraulic efficiency with a reinforced, annular corrugated exterior and a co-extruded integrated bell for watertight joints. Available in 12-inch through 60-inch diameters, TDR PRO® meets ASTM F2881 Class I and AASHTO M330 Type S, with watertight joints tested per ASTM D3212—making it well suited to commercial, industrial, and infrastructure drainage projects across Texas.