If the concrete is poured on a level and hard surface and the water can be diverted with a small pile of rock or dirt or gravel, then the concrete will not be damaged or have any problems. I have poured driveways and had the ground underneath wash out 3 feet wide by 6 inches deep and the driveway was still able to have cars drive accross it. using rebar or wire mesh correctly should be more than enough, but adding a little rock and or dirt in the front of the pad to help the water go around the pad should be fine. I find it hard to believe that they would suggest that there is that much water that it is going to destroy concrete.
Just dont dig the pad into the ground, build the forms above ground and backfill with rocks/sand/dirt and as long as it doesn't rain and wash out while the concrete is wet, it should be there for a while.
Chris Quarles 34486
IT DOESN'T MATTER HOW FAR IT MIGHT GO PAST THE BASKET, IF IT GOES IN.