23rd Street Sewer Capacity Augmentation

Splitting the flow with a diversion.

Dibble performed hydraulic analysis and design of a parallel 24-inch gravity sewer to augment flows in the existing 18-inch gravity sewer. Both discharge to a 48-inch gravity sewer. Due to existing constraints, both gravity sewers needed to be used, requiring Dibble to design a diversion structure to split flows unevenly to allow the majority of the flow to be conveyed by the 24-inch sewer, while excess flows would be conveyed by the 18-inch sewer. The design of the new 24-inch gravity sewer required significant SUE effort and extensive traffic control in coordination with local businesses.

New Manhole Tying UDA Sewer Line into Sewer Main


City of Tempe

Tempe, AZ


Construction Cost

Project Lifecycle

Installing 24-inch VCP Sewer Pipe on 23rd Street