Client Miami Dade Water & Sewer Department

Design Criteria Package for the Fisher Island 20-inch Water Main Replacement

Miami Dade County, Florida

As Owner’s Representative for MDWASD, LAN completed the preliminary engineering for this $85 million Design-Build (D-B) replacement of a 20-inch water main between Port Island and Fisher Island. This project crossed under an environmentally fragile area of Miami bay near the ship channel between some of the most congested, visible, and valuable property in the United States.
LAN recommend a preferred route for the replacement, along with recommendations for D-B logistics and design criteria for the 20-inch water main. The Design Criteria Package included the preliminary engineering, specifications, standards, and design criteria for 850 LF of 60-inch diameter steel casing micro-tunnel at a depth of 100 feet.

Developing a complete and trustworthy DCP for this D-B project was essential due to the numerous internal and external stakeholders, including regulatory agencies. Using dry shafts with coffer dams situated in the bay at the island’s edge, staging on land while working on floating platforms, and the right D-B team were critical elements of this project. LAN provided the right combination of technical understanding, engineering, knowledge of local conditions, and alternative delivery experience to this project’s success.

At a glance

$85 million construction cost

100-ft depth

850 LF


Owner's Representative

Design-Build procurement

Design Criteria Package development

Preliminary engineering

Alternative analysis

Stakeholder coordination


Alternative Delivery


Pipelines & Rehab

As of the 2010 census, Fisher Island had the highest per capita income of any place in the United States.