Help: Basement Flood

[Chuck Na]

I own a rental property on the South Side in Chicago in Cook County. With the major rainstorm we just had last week the basement for my tenant's unit (which is lived in) ended up under 3 feet of water. The water went away on its own and i have owned the property for 4 years before this without having this issue. I can normally deal with issues but this one has me perplexed.

Any suggestions? 

Does anyone have a good person to contact to try and figure out what issue is so it can be prevented?