The City spends more than $1,000,000 annually to rehabilitate and replace failing stormwater pipes connected to the public right of way. Corrugated Metal Pipe (CMP), the most common pipe material in Dunwoody, has a service life of 25 years. However, the average age of CMP in the City is over 40 years ago.  One of the standard methods Dunwoody uses to rehabilitate these pipes is a process called Cured-in-Place-Pipe lining (CIPP). It’s a widely-established technology that the City has used to rehabilitate more than seven miles of failing and aging pipes at 107 locations around Dunwoody over the last ten years. The lining process is much faster than excavation and avoids tearing up pavement, driveways, trees, and landscaping. Click below to learn more about how this trenchless technology addresses failing infrastructure.

CIPP involves inserting a flexible liner inside the existing pipe, inflating the liner, then introducing steam to harden the liner and seal off the holes in the original conveyance. The liner forms a smooth surface inside the existing pipe, restoring it to near-new condition. The liner is kept in a freezer until the installation begins, and once crews start the process for each structure, they must continue until the liner is in place and fully cured.  Otherwise, the material will harden without sealing the pipe, increasing the likelihood of sinkholes. Contractors typically complete CIPP projects during regular working hours, but the work can extend into the evening for larger pipe systems. 

What's that odor? Click here or on the image below to learn more about the Cured-In-Place Pipe method. 

For questions about pipe lining or other stormwater concerns contact the city’s stormwater utility team using the contact information below.