Dugway South CSO Relief and Conveyance Sewer, A Critical Connector

摘要

The Dugway South Relief and Consolidation Sewer is a critical component of the NEORSD Easterly CSO control system in Cleveland, Ohio, connecting four (4) other CSO tunnels in a dense urban neighborhood. Design and construction challenges included: previously fixed pipe elevations necessitated both soft ground and rock tunneling on the same alignment, underground hydraulic structures in poor ground conditions, tunneling beneath a critical unreinforced concrete box culvert built in the 1910s, contract constraints necessary for coordination with adjacent CSO contracts, and potentially gassy ground. The flexible bid documents allowed for a variety of construction means and methods, improving bids.