This is a test of commonsense. Complete the next sentence:

How to protect a basement from flooding
Get a propane or natural gas generator.
Do not waste your time buying a gasoline powered generator. You will have to be at home at the time of the power outage to start it.
You'll also have to keep returning to your home to add gasoline. There is a wide variety of propane or natural gas generators that run automatically when your power goes out.