Am i looking at six "tubes" with water in them? I see the long pipe laying across the sandbags, holding the plastic up. I noticed a garden hose in the picture shown here http://forums.investmentnation.com/showthread.php?t=701
It's not really that important if they have water in them or not. It is more of a mind teaser. (What am I really looking at) .. I can not think of any other reason for draping the plastic over the pipe. (Stop the water from leveling out) Right?