Engineering Project Case Studies | Erdman Anthony

Sewer Replacement

The City of Buffalo Department of Public Works had been planning a reconstruction of Niagara Street through its intersection with Jersey Street, but the 1900s-vintage 36-inch by 24-inch brick sewer running down Jersey Street was slated to be replaced under a future Buffalo Sewer Authority project. In order to prevent trenching through a newly constructed street, the sewer authority opted to replace a two-block section of the crumbling brick sewer.

This replacement required extensive planning and design by Erdman Anthony due to the extensive existing utilities. Several alternative alignments were considered, but, in the end, only one proved feasible.

The selected alternative was difficult to design and construct. The existing brick sewer was between an existing 48-inch water main and an existing 16-inch water main. Both water mains were over 100 years old and cast iron, with leaded joints.

Minimal clearance existed between the water mains for removal of the existing brick sewer and installation of the proposed 24-inch PVC sewer. Ultimately, the contractor was required to have a sheeting/shoring system installed that would allow for the removal and the replacement of the existing sewer.

Furthermore, connection to the existing brick sewer would be required on both ends. In order to accomplish this effort, thermoforming of the connection would be required. The plans called for the contractor to make a template from the existing brick sewer and construct a form upon which the PVC pipe would be thermoformed to attain the desired shape. The PVC pipe was heated sufficiently to become pliable and then placed on the form to achieve the desired shape.

The completed plans, specifications, and estimate were packaged, prepared, and given to the public works department for bidding, utilizing combined standards of the public works department, the sewer authority, and NYSDOT.

Erdman Anthony also completed construction administration and inspection services for this project. These activities required extensive coordination with the sewer authority, the contractor, the public works department, and numerous public and private utilities.

Daniel Ziemianski, PE
Daniel Ziemianski, PE
 716-631-1241 x 1103