Storm drains could be located anywhere water has a chance to accumulate. If there are any on your property inspect them regularly, keeping the covers clear of any debris or other obstructions. Next, if you have a sump pump, make sure that it is functioning properly. Check the float ball and rod, making sure the ball is in good condition and that the rod moves freely in its bracket. Also check the connections of the outlet hose and clear the intakes of any debris.
Most policies exclude damages from sump pump failures, even due to a power outage.
Access to a generator to run the pump and provide enough current for a few essentials should be a key part of your contingency plan. Items stored on basement floors could be excluded from your contents coverage if damaged by ground water. Keeping these items off of the floor, on wooden pallets or tables, may be enough to save them in an emergency. One final note on the importance of maintaining your roof system. Include this in your scheduled inspections, particularly the flashing.