PAT field, yes we have a PAT field and yes we continue to have the pump system in place at Scott Field.
The crown on athletic fields was a requirement on old school artificial fields because they were laid onto of concrete and the water had to go somewhere. Even natural fields had to be crowned without the subterranean drainage systems available today.
First is starts with French drains and gravity then you add suction power of sub air drainage systems. Sub air not only removes excess moisture but it also pulls oxygen through the soils and helps improve the turf's ability to grow.
If any collegiate or professional team doesn't have a flat field it is pure stupidity and lack of funds. It is not cheap but not hard to install these systems.
The PAT fields are flat to a degree depending on how they grade the surface prior to seeding, spriging, or sodding the playing surface. The best surfaces are graded in multiple directions and conclude with circular patterns using laser level systems from multiple areas.
MSU's turf program originally did the playing surface at the Arazona Diamondbacks field as well as a few other professional and collegiate facilities (I believe many years agos they even did the field at Darrell K Royal Memorial Stadium in Austin, Texas but I will admit I do not remember 100%).
Before you bring up Dudy Noble Field the left field area is ( or could be was by now) always crowned and not because of a lack of trying but more so because of a lack of dynamite. That area of the field was on solid rock creating the crown as well as poor turf conditions years ago.
Just my 2 cents.