The goals were straightforward. Replace a leaking potable water line. Protect the environment. Provide customers with reliable water for many generations. The path to success, however, for Miami-Dade Water and Sewer Department’s (MDWASD) Infrastructure Assessment and Replacement Program (IAARP) wasn’t as straightforward as the goals.
The new water pipeline would need to be embedded some 60 ft under the bottom of the Biscayne Bay and consist of one, 4,000-ft long line. The environment was fragile. Plus, the new line had to be leak-free and have a 100-year projected life span — the old one was just 25 years old. These issues were resolved because the county elected to use highdensity polyethylene (HDPE) pipe for this trenchless installation, which it has also been using in its 2-in. water line replacement program for several decades.