When it comes to drainage solutions in aggressive environments, material selection makes all the difference. Traditional galvanized corrugated metal pipe often struggles to withstand the corrosive effects of saltwater, brackish water, and hypersaline soils. That’s where Corrugated Aluminum Alloy Pipe (CAP) stands apart.

America’s Wastewater Infrastructure is currently rated at a D+, according to the 2025 ASCE Report Card for America’s Infrastructure. The Wastewater category includes both piping for the collection systems and the wastewater treatment plants the piping leads to. The collection system alone experiences 3.3 failures per 100 miles of pipe every year, putting pressure on maintenance teams to identify suspect pipes for either complete replacement or pipeline rehabilitation. This article will focus on the design and construction considerations necessary when a pipeline owner determines they will be rehabilitating an existing pipe.

Stormwater design isn’t always straightforward. Between utility conflicts, easement restrictions, odd property lines, and topography, most sites require more than a one-size-fits-all solution. That’s where the flexibility of corrugated metal pipe (CMP) comes in.

When it comes to underground stormwater systems, longevity depends heavily on material selection. While all corrugated metal pipe (CMP) systems offer structural integrity, the right coating ensures they perform for decades in the specific environmental conditions of your site. This article breaks down the main CMP coating types, their performance in different soil and water conditions, and when to use each.