Development of a Passive Operating Scheme for a CSO Capture Tunnel
Abstract:The Upper Rouge Tunnel (URT) is a proposed seven mile long CSO capture tunnel within the Detroit Water and Sewerage Department (DWSD) combined sewer system that will be filled at drop shafts along its length. During filling, surge waves will result that, if left uncontrolled, could damage structures. Surge control facilities will depend on the operational scheme selected and will be required along the entire length of tunnel.
The design team's philosophy was that tunnel filling and surge control should occur as passively as possible. That is, the DWSD should operate as few pieces of equipment (such as control gates) as possible during filling. There is risk of human error, mechanical failure, electrical failure, communication failure, and computer control system failure with equipment operation. Mechanical equipment also requires significant maintenance.
Detailed analyses of the tunnel system were performed to determine the surge control facilities required for alternative operational control schemes. The main objective of the surge modeling was to determine the most economical control scheme that will effectively and passively handle surge, limit tunnel construction risk, and reduce the amount of preventative and long term maintenance for DWSD. All the goals needed to be met while also providing the required tunnel capture volume.
Document Type: Research Article
Publication date: 2006-01-01
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