Do flood-proof your heating and electrical systems
If you live in a flood-prone area, it's a good idea to elevate your utility systems (furnace, fuse box, electrical panel, etc.) at least one foot above the highest-known local flood level. Appliances like washers, dryers, and water heaters should also be raised up on water-resistant bases or moved to a higher floor of your home.
Do stock up on sandbags
Sandbag materials are available at home supply stores. Local authorities may also supply them if a major storm's coming. Place sandbags against ground-level exterior doors, window wells, drainage holes, and other points of entry. They won't create a watertight seal, but they can help divert water around your building. Sandbags are heavy and difficult to handle, so enlist the help of others when filling and carrying them.
Don't try to create a fortress of sandbags around your house
This can trap water between the bags and the building and cause structural damage.
Don't drain your swimming pool
It might seem like a good idea to empty the pool so it won't get contaminated or overflow. However, storms often cause underground water tables to rise, which can force your pool out of the ground if it isn't weighted down.