She said some preparations are as easy as a trip to the hardware store. "Make sure your eavestroughs are clear and your downspouts allow water to flow away from your foundation. Put valuable things or potentially toxic items up on a basement shelf, so they don't get damaged or contaminate water." Lou Di Gironimo, general manager of Toronto Water, says storms have become more severe over the past few decades and the city has invested billions of dollars in flood mitigation programs.