Oh as far as flooding, I am on the south side of Rt 3, so I can't speak for the north end. Considering the numerous storms we have seen the past year I haven't had any problems. There is one area around the Rt 3 Meadowlands Parkway ramp that gets a little wet when storms are severe but it isn't a flood, just a small pool of water but the town has a good system it is usually taken care of. Again you would get that just about anywhere. I always here about flooding in some towns but I have never heard of any flooding in this area that made the news like I have heard of in other towns.
Also in terms of flooding, Secaucus doesn't have proper drainage of water. When it rains really hard the water can get so high that it can seep into your car if you are in certain areas that are prone to flooding. Park your car on a hill when high volumnes of rain are exprected and then at least your car is safe. But as far as your home, if you don't have french drains installed, get them installed before you buy your home.....
Best of luck to all of those that plan on buying homes in Secaucus or renting in that area.