A bill to amend the National Flood Insurance Act of 1968 to clarify the effective date of policies covering properties affected by floods in progress.

Amends the National Flood Insurance Act of 1968 to state that, if a flood has commenced or is in progress before expiration of the 30-day waiting period before a new or modified flood insurance policy becomes effective, the insurance coverage shall take effect upon the expiration of such 30-day period. Allows coverage for damage occurring after expiration of the waiting period, however, only if the property has not suffered damage or loss as a result of such flood before the waiting period expires.