Act of God

In legal usage in the English-speaking world, an act of God, act of nature, or damnum fatale ("loss arising from inevitable accident") is an event caused by no direct human action (e.g. severe or extreme weather and other natural disasters) for which individual persons are not responsible and cannot be held legally liable for loss of life, injury, or property damage.

[12] Under the English common law, contractual obligations were deemed sacrosanct, so failure to honor a contract could lead to an order for specific performance or internment in a debtor's prison.

[13] In other contracts, such as indemnification, an act of God may be no excuse, and in fact may be the central risk assumed by the promisor—e.g., flood insurance or crop insurance—the only variables being the timing and extent of the damage.

In many cases, failure by way of ignoring obvious risks due to "natural phenomena" will not be sufficient to excuse performance of the obligation, even if the events are relatively rare: e.g., the year 2000 problem in computers.

Explained by Lord Hobhouse in Transco plc v Stockport Metropolitan Borough Council as describing an event: In Tennant v Earl of Glasgow (1864 2 M (HL) 22) Lord Chancellor Westbury described a case as: "what is denominated in the law of Scotland damnum fatale — occurrences and circumstances which no human foresight can provide against, and of which human prudence is not bound to recognize the possibility; and which, when they do occur, therefore, are calamities that do not involve the obligation of paying for the consequences that may result from them.

[20] The region was soon flooded by heavy rains, nearly bursting the reservoir's dam, killing nearly 20 people, destroying 110 bridges (leaving 2), knocking out telephone and telegraph lines, and causing an estimated $3.5 million in damage in total.