CN,
Buoywalls, or collar tanks, are usually filled by road tankers, to supply either helicopters or fire crews in remote areas. In this case (Jindabyne fire) we are topping up buoywalls to support the ground crews, who have put in a fairly massive control burn over the past 4 days, and need the water. The track is not suitable for road tankers, so we got the guernsey to haul water from the Snowy River.
It's a lot easier to get the water out with a Bambi bucket, than to put it in
