As part of a major infrastructure project at the Schoharie Reservoir in Gilboa, New York, Stiver Engineering provided a variety of services for a low-level outlet designed to release water downstream into Schoharie Creek to facilitate dam maintenance and emergency response, mitigate flood risk, and enhance downstream habitat for fish and wildlife. The work includes construction of a 9.5-foot diameter micro-tunnel at a depth of 160 feet. Stiver provided designs for the gate shaft as well as analysis of the steel jacking frame for the tunnel machine and steel pipe. We also provided trench safety designs, thrust block designs, steel pipe casing designs, anchor bolt attachment designs, and a structural review of the Herrenknecht tunnel launch seal and pipe break frames, among other services.

The Chelford City Diversion project will consolidate and upgrade public works facilities in part of Houston through the installation of sanitary sewer lines, manholes, reinforced concrete pavement, and curbs. As part of the project, Stiver Engineering redesigned a concrete vault at the junction of a 60-inch sanitary sewer pipe and a 108-inch sanitary sewer pipe. The bottom of the 22-foot-tall concrete vault was 70 feet below the existing ground.

 As part of the Brazos Street Bridge demolition in Houston, Texas, Stiver Engineering provided a demolition staging plan for the bridge concrete decking that would be replaced. We also developed a bridge beam shoring system and a plan to jack up the steel bridge beams to replace existing bearing pads at all bents and the abutments.

The city of Conroe, Texas, is building a $60 million Central Wastewater Treatment Plant that will be designed to handle up to 12 million gallons per day. Stiver Engineering provided design services for a 38-foot ID Lift Station for the new Central Wastewater Treatment Plant in Conroe, Texas. Our work included sinking calculations and the finite element analysis of the exterior walls and the caisson bottom slab.

Using Danby liner and grout, Stiver Engineering provided a pipe rehabilitation design for a 93-inch arch pipe at a wastewater treatment plant in Cincinnati, Ohio. The existing pipe section along with the Danby liner and grout allowed us to create a composite section. The composite section was designed so the contractor could provide a clear span over existing utilities. Stiver also designed bulkheads inside the existing 93-inch arch pipe to provide access for the pipe’s rehabilitation.