TxDOT Storm Water Pump Stations

CobbFendley is assisting the Texas Department of Transportation – Houston District in the preparation of Plans, Specifications, and Estimates for the rehabilitation and replacement of four storm water pump stations located in Harris and Brazoria Counties. Two of the four pump stations will be demolished and replaced. The other two are to be rehabilitated, maintaining their existing motor control center building and wet well structures.

The two sites consisting of full pump station replacement include removal of the existing building structure, removal of all existing pumps and appurtenances, abandoning, and backfilling the existing wet wells. The improvements involve replacing the existing storm sewer system in the depressed areas with added flanking on-grade inlets. with the installation of new pumps in a 21-foot diameter wet well at each of the two locations, the overall pumping frequencies will be doubled, effectively reducing the flooding of the depressed underpasses they service.

The proposed electrical buildings in the replacement pump stations consist of new motor controls, instrumentation, lighting, and HVAC to maintain a safe temperature to protect sensitive equipment from overheating. The proposed pump station sites consist of larger areas for parking and ease of maintenance. The electrical building and wet wells are set at above the 100-year storm event water surface elevation.

At the two sites being rehabilitated, the existing pumps, motor controls, HVAC, and instrumentation will be removed and replaced, while the existing structures will be maintained. t the rehabilitation sites, the proposed pumps will have higher pumping frequencies than the existing ones. Newer pumps will be installed in the existing wet wells to mitigate flooding in the existing depressed service areas. All four pump stations will be equipped with new standby natural gas-powered generator systems, housed in sound and weather-proof enclosures outside the electrical buildings. These generators will serve as a reliable backup power source in the event of an electrical failure.1