The AquaDam® continues to unroll as it fills. The dam is actually reaching 8' below the top of the water and is pushing on the bottom of the lake. You can walk out on it and stand on the unrolled portion. 

You can see the folded-in sides unfold directly behind the rolled up AquaDam®. A rope is tied to the outside end of the wooden core that the AquaDam® is rolled around. This allows workers on the bank to pull the AquaDam® around at the appropriate angle to connect back into the bank.

The AquaDam® has to fit between these columns to intersect back in with the bank to make a watertight cofferdam. Rope angles have to be continually changed. The pumps leading to the "inside" inner tube of the AquaDam® are shut off, and the pumps leading to the "outside" turn are left on. 

A rope is now attached to either end of the wooden core so that the AquaDam® can be manipulated between the columns. Ropes have been left around the AquaDam® in case it needs to be pulled into position.