WASHINGTON — The federal government has a large rainy-day fund on hand to help mitigate the expanding damage on the Gulf Coast, generated by a tax on oil for use in cases like the Deepwater Horizon spill.
Up to $1 billion of the $1.6 billion reserve could be used to compensate for losses from the accident, as much as half of it for what is sometimes a major category of costs: damage to natural resources like fisheries and other wildlife habitats.
Under the law that established the reserve, the operators of the offshore rig face no more than $75 million in liability for the damages that might be claimed by individuals, companies or the government, although they are responsible for the cost of containing and cleaning up the spill.



