Boise, ID — Rehabilitation of Failed Corrugated Metal Pipe Spillways

Boise, ID – ADA County CMP 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.

Abstract
In Boise, ID, the drainage department considered replacing existing corrugated metal pipe used for under-the-road storm drainage. Many of these structures have reached the end of their useful life because of deterioration of the corrugated metal pipes by corrosion. This Field Report presents an existing application where deteriorated pipes were rehabilitated using polyethylene pipe for sliplining existing corrugated metal pipe.

The Problem
The Highway 20 spillway conduit was 90 feet long. This would represent a major headache and cost outlay if the busy Highway 20 had to be excavated to rehab the existing CMP.

The Solution Applied
Larry Case, the Snap-Tite representative in Reno, NV, worked with Tom Myers of W3. W3, a subsidiary of United Pipe and Supply, provided the Snap-Tite pipe. Attending this demonstration was Scott Bevens, also of United Pipe and Supply, and about 20-30 people from IDOT (Idaho Department of Transportation). The demonstration, installed by IDOT personnel, showed that an Snap-Tite 24-inch OD SDR 32.5 HDPE slipliner pipe should be specified for the job.

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