Drilling a hole in the cast iron drain line: Bad idea in Lemay, MO

A trick to help drain water from beneath the basement floor is to drill a large hole in the drain line of a floor drain, low enough to let water in from under the floor.  But if you are relying on that and do not also have a sump pump...ouch!  We retrofit our TripleSafe® sump pump system. After getting wet three times, this Lemay, Missouri homeowner didn't want that to happen ever again.  The TripleSafe® has three operating pumps, not all at the same time, and one is a battery backup pump for operating during a power outage, or if a breaker trips, water levels rise, or if one of the primary pump fails after years of being in service.