The fill tubes come out the top and allow you to slip a hose into the AquaDam® and pump in water. Any water that seeped under the larger AquaDams® would be trapped by the backup dams and would be pumped out. This worked well for backing up the main, continuous, water-filled cofferdam.  

In shallow water, it was possible to stand up inside the attachment collar. This made the coupling process easier. The plastic fill tubes are tied with small diameter rope. This prevented water from building up inside the tubes, becoming too heavy, and pulling the plastic down off the top and over the side, allowing water to spill out.

This is looking across the shallow water into the end of (4) 8' x 100' AquaDams® connected together. These were placed through the deepest water, but due to the elevation rise in the bottom of the lake, the water is now only waist deep and the workers can stand while attaching the next AquaDam®.  

The AquaDams® have 130' left to go before making a connection in the middle of the lake. Backups were than installed alongside the larger AquaDams® to provide support against sliding on the muddy, slippery lake bottom.