The following day, July 16, the aircraft made two drops on the Sawtooth fire, and CAL FIRE personnel were reported to have said that "the two fire drops made a greater impact on containing the fire than the 12 helicopters drops for the past 10 days."
Above is a cut and paste from an article in wikipedia about a DC-10 water bomber being used in the USA
Depending on the fill facilities they can be filled in 8 minutes
The take off weight is 40% less than when being used as a commercial airliner
The drop zone measures 90m x 1600m
1 drop = 12 drops from a grumman water bomber.
I believe this is the same as the one in NSW now and all we need is more of them.