Flooded basement
With all this water in the basement, there isn't any room for storage. What a waste of space.
Constant dampness in the basement
With most of the water gone, the dampness remains. This leads to that musty smell.
Sump pump in the basement
Most houses have a weak sump pump in the basement. What good is the sump pump in the middle of the floor if the water is coming in through the walls?
Hot water heater in the basement
A lot of basement have appliances such as water heaters, clothes washers & dryers, or HVAC units. If these things get wet and ruined, you could be looking at thousands of dollars to replace them.
Ugly blocks in the basement
Even after the water drys up a bit, the residue is left behind, along with the smells and stains.