Final answer:
Flood policies usually have a 30-day waiting period, but there are exceptions that allow coverage to start immediately.
Step-by-step explanation:
Flood policies usually have a 30-day waiting period before coverage takes effect, except in certain cases. Some exceptions include when the flood is caused by a natural disaster, when the property is located in a high-risk flood zone, when the policyholder pays an additional premium, or when the flood is a result of a federal disaster declaration. Under these circumstances, coverage can start immediately without the waiting period.