Said by alkizmo
"I wonder, why don't they make a drain hole at the bottom of the chassis? Water just pools up in there! "
The water level is designed at a specific height to keep a specific amount of water in the unit. The fan is designed to splash water up on the coils as it runs to aid in cooling thru evaporation. There is a designed "drain" somewhere, usually just above the bottom of the coil, but it may also just be the height of the case itself.