right on the slope, but we really can't change the slope and we need it to help with drainage. Otherwise it'd be another BIOS lake. And we don't have any more dirt.
In the old construction thread there was also talk of moving pipes to change the lay out. It never happened, probably due to the labor just getting the pipe to the right length and staking it down. Plus after the track has been run on and rained on the "track" is still there with some pretty drastic elevation changes.