COH Hedrick Force Main Crossing Replacement— 42” Horizontal Directional Drill Under Buffalo Bayou

Stiver Engineering provided the horizontal directional drilling alignment and pulling calculations for a 42’’ inch diameter force main crossing beneath the Houston Ship Channel adjacent to the 69th street wastewater treatment plant. The purpose of the HDD installation was to replace the existing Hedrick Force Main Aerial Crossing. The HDD was approximately 1,000 ft. and…

Plum Creek HDD Project

Stiver Engineering provided the contractor with an alternate tunneling method for a 6-inch diameter force main.  The alternate design consisted of a horizontal directional drill (HDD) that was 21 ft. beneath an existing railroad.  The pull forces and pipe stresses were analyzed and a profile was delivered to the contractor for construction.

Ashbridge Bay Treatment Plant Outfall

Stiver is proudly supporting the Ashbridge’s Bay Treatment Plant Outfall. This $300 million project for the City of Toronto will replace the current outfall tunnel, which is at the end of its service life. It is set to be the largest wastewater outfall in Canada. The project includes a 16-meter diameter shaft by 85-meter deep,…

Paradise Whitney Interceptor

The sewer system in the city of Las Vegas was disjointed and inefficient. Connections to the main sewer line were sporadic, and relief sewers could not adequately intercept flow. To support the City’s waste management, Stiver Engineering provided key design services for the Paradise Whitney Interceptor in Las Vegas. The project consisted of a 32,000-foot…