— This action was commenced by plaintiff to recover damages from the defendant for the washing away of a portion of plaintiff's premises and property, alleged to have been caused by the construction and maintenance of a boom owned and operated by defendant in the Lewis river, on the opposite side of the river from plaintiff’s land. The case was tried to a jury, and a verdict returned in favor of defendant. Plaintiff appeals.

Lewis river is a navigable, meandered stream, and respondent is a corporation, organized under the laws of fhe state of Washington for the purpose of constructing and operating a public boom. The question at issue on the trial was whether the boom caused the current to set across the stream and against the shore with greater volume and with more destructive force than it would have done if the boom had not been constructed where it was. The following instructions, among others, were submitted by the court to the jury, and the giving of such instructions is assigned as error by the appellant:

“(1) An extraordinary flood is an act of God, and imposes no liability upon him whose lawful structure is an instrument causing damages to others. The defendant was and is oidy bound to build and maintain its said boom as reasonable men *199can foresee shall be necessary to meet the ordinary contingencies and demands of nature, and cannot be held liable for these extraordinary visitations whose comings could not have been anticipated or guarded against by the exercise of ordinary foresight.

“(2) If the flood or floods that caused the damage to plaintiff’s land were sudden and unusual floods whose comings could not have been anticipated or guarded against by the exercise of ordinary foresight, then the defendant is not liable for any damages caused thereby, notwithstanding the boom or its operations have contributed to the washing away of plaintiff’s land.

“(3) As to these items (referring to the barn, $1,000; hay $975, and feed $25, as per transcript, page 21), the question has been raised that the loss of same was due to the negligence of plaintiff in not saving same when he had an opportunity. If you find defendant offered to remove this property to a place of safety, or assist in doing so, and the same could safely have been done, but was not done on account of plaintiff’s refusal to save or permit this property to be saved, then you are to allow no damages on account of the loss thereof.”

The term “Act of God” has received multifarious definitions. It is defined in “Words and Phrases Judicially Defined,” page 118, as follows:

“It is said to be that which is occasioned exclusively by the violence of nature; by that kind of force of the elements which human ability could not have foreseen or prevented, such as lightning, tornado, sudden squall of wind, and the' like. Again, it is said to be, at least, an act of nature which implies entire exclusion of all human agency whether of the carrier himself or of third persons. It is called a disaster with which the agency of man has nothing to do. It is defined to be a natural necessity, which could not have been occasioned by the interference of man, but proceeds from physical causes alone.”

And a multitude of cases are cited to sustain these definitions. In Niblo v. Binsse, 44 Barb. 54, it is defined as any inevitable accident, and is construed to mean in law something in opposition to the act of man. In Klair v. Wilmington Steamboat Co., 4 Penn. (Del.) 51, 54 Atl. 694, it is said that by act of *200God is meant some inevitable accident which cannot be prevented by human care, skill, or foresight. It has also been described as involving some notion of an accident from natural causes impossible to be foreseen and impossible to be guarded against. In Tompkins v. Dutchess of Ulster, Fed. Case. No. 14,087a, the court said that the act of God which excuses a common carrier from liability must be the immediate and distinct result of providential events, sudden or overwhelming in their character, which human foresight could not foresee. It would not be profitable to incorporate any further definitions of the term in this opinion.

It is contended that the court erred in instructing the jury that an extraordinary flood was an act of God and imposed no liability upon him whose lawful structure was an instrument causing damage to others. We think this contention must be sustained. In the first place, there was no allegation in the answer that the accident complained of was caused by the act of God, and neither was there any proof offered to that effect, the proof being that the flood which caused the damage was extraordinary, but not that it could not have been reasonably anticipated and guarded against by ordinary prudence; for the testimony was that, during the life of citizens in that community, floods equal to the one in question had been known some six or seven times, on some occasions even higher than it was at the time the damage was wrought.

The respondent contends that, notwithstanding the fact that the first instruction of the court might be erroneous, it was error without prejudice, for the reason that the subsequent instruction of the court properly stated the law, and that the jury would understand that the court was referring to floods which ordinary prudence could not have foreseen or guarded against. But the term “Act of God” is an expression which conveys a portentous thought to the minds of common people. When the court instructed the jury that an extraordinary flood was an act of God imposing no liabil*201ity upon the defendant in the case, and the evidence showed that the flood was extraordinary in the sense of not occurring every year, it is plain that the jury were misled by this instruction. In any event, it is the universal rule of this court that, when it is determined that error has been committed, the presumption that it was without prejudice must conclusively appear from the record. The court having injected into the case an element neither raised by the pleadings nor sustained by the testimony, and it not affirmatively appearing that the error was not harmful, we must conclude that the action of the court in the matter complained of constituted prejudicial error.

In Gulf, Colorado & S. F. R. Co. v. Pomeroy, 67 Tex. 498, a distinction is made between prudence required of a person where his own property is in danger, and that required where the property of other persons is involved, the court saying:

“A careful person in constructing a like improvement which endangered his own property, might prefer to take the risk of a loss from either ordinary or extraordinary floods to incurring the certain expense necessary to make an effectual provision against them. But this rule certainly would not do, when the property of others- is subjected to the risk of destruction or damage. In our opinion the true test is, considering all the circumstances and especially the history of the stream, would a prudent man have anticipated such a flood as caused the damage. . . . Knowing that an extraordinary inundation has occurred more than once, and for that reason that it may occur again, a party who has constructed a work which obstructs its outflow and causes it to submerge the property of another to his damage, will not be permitted to defend against the wrong by setting up the fact that the floods not provided for have occurred only at long intervals.”

This case seems to be exactly in point, and it seems to us states the law fairly, the testimony in this case showing that a flood of equal height and velocity had occurred several times prior to the occurrence of the one involved in this action. The contention of the appellant is not unreasonable, that the *202result which would follow the instruction of the court would be unjust and that protection against an ordinary flood which occurs every year, simply to preserve the property for destruction by an extraordinary one, known to occur every six or seven years, after improvements had been made upon the land and it had been made more valuable, could not be justified under any theory of law or right. The further citation of cases, it seems to us, is unprofitable. We have examined many and are unable to find any case, including the cases cited by the respondent, that would sustain the instructions given in the matter complained of.

Again it is contended, and we think with justness, that the court erred in the third instruction complained of. In the first place, the court’s instruction was in the alternative, that “if the defendant offered to remove this property to a place of safety, or. assist in doing so.” In order for the respondent to escape the responsibility, it must have offered to remove the property at its own expense. The duty of the appellant being only to make ordinary effort for the preservation of the property, it was not bound to make extraordinary effort or incur extraordinary expense disproportionate to the results to be obtained. Nor would his failure to make any effort result in depriving him of all damages^ the la-w imposing upon him only the duty to minimize the damages. But conceding, without deciding, that the doctrine of minimizing the damages can arise in this kind of a case at all, in any event, the instruction was too broad and left out elements which must in all conscience be considered. The learned counsel for the respondent says the boom was a lawful structure, doing a legitimate business, and that if during a flood the boom increased the flow of water past the appellant’s premises, and respondent, seeing the danger, offered to save the property free of cost, the appellant could not refuse to permit it to do so and still hold it responsible. But in addition to the fact that the statement in the brief is broader than the instruction to the court, there certainly must be an element *203of choice in the matter of the location. A man usually locates his barn or his house with reference to the convenience of the location. The barn or the house is also a lawful structure doing a legitimate business, and it might very reasonably happen that the value of a barn would be very largely depreciated by moving it to another location, with reference to ingress and egress to and from the barn, and with reference to many things that are ordinarily taken into consideration when a barn is located. This choice of location cannot be taken from the owner and given to somebody else. A person who wishes to go into a business, be it ever so legitimate, cannot say to another person who has his houses and buildings on a certain location which has been chosen by him, “You must permit me to move your houses to another location on your premises or the business which I am instituting will damage them, and if you do not permit me I will not be responsible for the damages incurred.” So that at least there must be taken into consideration the difference between the value of the property after it is moved and its value where it was located by its owner.

We think, for the reasons assigned, that the judgment must be reversed and a new trial granted.

Hadley C. J., Fullerton, Mount, and Crow, JJ., concur.

Chadwick, J., took no part.