Just a foot or two at a time. You must remain patient. If the AquaDam® is unrolled without sufficient head pressure inside, it is possible that lateral movement could occur. AquaDams® are much more likely to move laterally in moving water applications. 

Notice how the water flow increased as the channel was closed off. If this AquaDam® were being installed in moving water, more head pressure would be necessary.

A view from the opposite bank. The AquaDam® is almost completely across.

The AquaDam® continues to fill.