KWA Water Supply System

In order to avoid ever-increasing water rates from the city of Detroit, several counties and other public agencies banded together to form the Karegnondi Water Authority (“KWA”) to provide and distribute raw water to the region of the State of Michigan commonly referred to as the I-69 corridor. The boundaries of the water supply system reach over 2,400 square miles and over a half million people. The entire KWA water supply system was constructed for significantly less than the proposed budget.

Between 2013 and 2016, L. D’Agostini & Sons, Inc. successfully constructed 5 of the KWA projects that make up the KWA Water Supply System. In 2013, L. D’Agostini & Sons, Inc. was proud to commence the construction of the KWA Water Supply System by installing the water supply intake. The scope of work for the intake project included the construction of a 78” diameter water intake pipeline in Lake Huron by tunneling and marine excavation, including two timber crib intakes, a 30’ diameter by 70’ diameter by 70’ deep concrete junction chamber, related appurtenances, and site work in Worth Township, Sanilac County, Michigan. Through value engineering, L. D’Agostini & Sons, Inc. was able to generate significant cost savings to the owner by eliminating an approximately 35’ diameter x 65’ deep shaft and tunneling directly into what would become the Lake Huron Pump Station’s wet well.

L. D’Agostini & Sons, Inc. was also awarded KWA Project S-4001, which included the construction of the Lake Huron Pump Station that connected to the Lake Huron Intake. The Lake Huron Pump Station is a 60 MGD firm capacity pump station including four vertical turbine pumps, enclosure building, and a reinforced concrete wet well structure.

As part of its contract scope for Project S-4002 and S-4005, L. D’Agostini & Sons, Inc. installed roughly 24.0 miles of 60” and 66” welded steel raw water transmission main, including several box culverts, air release valves, hydrants, other appurtenances, and associated road reconstruction. During construction, L. D’Agostini & Sons, Inc. had to use a pile and cradle system in 2 peat bog areas to keep the steel water main from floating. These projects also included multiple boring operations.

Last, L. D’Agostini & Sons, Inc. successfully installed roughly 6.0 miles of 48” finished welded steel water main, other appurtenances, and associated road reconstruction in Genesee and Lapeer Counties for Project S-5005.