Boise, ID — Rehabilitation of Failed Concrete Pipe Spillways

City of Boise, ID concrete drainage spillway

Our purpose is to help customers choose solutions which will insure that the process fits the application and do this reliably and cost-effectively. All information in this Field Report will assist the engineer to reduce cost and minimize future maintenance costs.

City of Boise, ID, considered replacing and rehabilitating existing poured concrete sanitary sewer pipe. Many of these structures have reached the end of their useful life because of deterioration of the concrete pipes. This Field Report presents an existing application where deteriorated pipes were rehabilitated using polyethylene pipe for sliplining the existing concrete structure.

City of Boise, ID, had a 100-year old, poured concrete storm sewer drainage spillway that was deteriorating and presented a costly dilemma. Conventional methods were expensive and time consuming. There was a need to evaluate a less costly alternative repair method.

The Problem
The poured concrete sewer ran down the middle of the street. This would represent a major cost involving three weeks of digging, removing and replacing the old pipe, as well as major traffic tie-ups.

The Solution Applied
Larry Case, the Snap-Tite pipe representative in Reno, NV, worked with Tom Myers of W3 Boise, ID. The job was designed by John Tensen, City Engineer for the City of Boise, and his staff. The pipe was installed by Steve Sommers, Lee Sommers & Don Newton all of Sommers Construction, Nampa, ID. Attending this installation was Bill Ancell, City Director; Ivan Butterfield, Engineer; Steve Dunmore & Mare Johnson, Technicians; Mike Strassen & Rick Cummings, Inspectors. This demonstrated that a Snap-Tite 32-inch OD HDPE slipliner pipe should be specified for the job. Because of Snap-Tite’s “snap” joint, this eliminates the expensive butt fusion process and increases the speed and ease of installation. The sliplining of this 36-inch concrete conduit was done from an excavation pit dug at a manhole 580 feet away.

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