Firstly, you should gather important documents and files, and store them in waterproof containers. This includes backing up computer files to an external hard drive. You should also prepare at least 3 days of food for any pets and keep copies of pet paperwork. Have an evacuation plan for your family to safely exit the home in a flood. Catalog your belongings to assist with any insurance claims later. Check that your homeowners insurance includes flood coverage, and sign up for separate flood insurance which takes 30 days to activate. Install a non-return valve to prevent sewage backup from floods.