Ian,
What's "the rest"?
All I'm saying is, most 200-300 acre properties drain naturally (in regard to fairway areas, not greens in most cases, of course).
There's a natural drainage pattern in place. Ideally, golf courses should be designed around those natural drainage patterns, as opposed to disrupting them and necessitating the installation of too many catch basin drains in the fairways.
We didn't "shape" any of the fairways at Blackhawk, except the 1st and 14th. But a few modifications were made, here and there, to direct surface water off fairways. Granted, there are a few catch basins in the fairways at Blackhawk, but we tried to direct surface water to "out of play areas" rather than simply direct it to a catch basin in the fairway.