LATIMER, Justice.
On the 28th day of February, 1946, plaintiffs’ home in Ogden Canyon was damaged by a large volume of water which flowed across their property and through their house. Their furniture, fixtures and clothing were damaged by the water and large quantities of mud and silt were deposited on the floors of their home. The water had escaped from a seventy five foot wood stave pipe line used by the defendants to divert water from Pineview Dam for power and irrigation purposes. In the action commenced in the court below, the matter was tried before a jury which found in favor of plaintiffs and from the judgment entered upon
its verdict, defendants have appealed. We shall refer to the parties as they were designated in the trial court and the testimony will be viewed in a light favorable to respondents.
In 1935 pursuant to a contract between defendants and the United States of America a seventy five foot wood stave pipe line was constructed to carry water down Ogden Canyon. The conduit was installed on a right of way owned by defendant, Utah Power and Light Company, and for all practical purposes was to be aligned, graded and buried substantially the same as a line which was being replaced. The plans and specifications for the installation were subject to the approval of the Power Company and the work was to be done to its satisfaction. Since its installation the line has been used and maintained by the defendants jointly.
On the night in question, the pipe was broken in two places. The larger of the two breaks was on the west and the smaller on the east. From the position of the rocks after the break, it appears that the damage on the west was caused by a boulder estimated to weigh nine tons while that done on the east by one or two rocks of approximately two by two by three feet in size. Both breaks were of sufficient size to permit a large volume of water to escape according to witnesses who estimated the hole on the east to be four feet by two feet in size. The pipe had been covered with some dirt at the point where it was damaged on the west but was uncovered at the other place of damage.
The conduit had a carrying capacity of 320 cubic feet per second and at the time of the break the flow was about one half this volume. The line ran in an easterly-westerly direction down the canyon and, in the vicinity of the breaks, was at a higher elevation than the highway and homes built and occupied by people living in that area. There was a river bed in the bottom of the canyon which would canalize the water once it reached that level, but plaintiffs’ home was between the conduit and the stream bed.
Winter snow had fallen and the state highway department in clearing the main travelled portion of the highway had banked the snow on the shoulders of the road. These snow banks confined the water that had escaped through the breaks and as it coursed down the canyon. Apparently the first point at which the water could escape from the highway was in close proximity to plaintiffs’ house and as a result, the course of the water after leaving the road bed was through the plaintiffs’ home.
There are rocky cliffs about one half mile north of the places where the pipe was broken. They are steep, rugged and nearly perpendicular at that distance. While the intervening territory is not nearly so steep, the slope continues to the south and once a boulder starts rolling there is little to stop or retard its speed until it reaches either the highway or the river bed.
Before concentrating on detail it may be well to place the principle issue in a large perspective. This issue affects the question of determining what is due care in the construction of a conduit designed to confine a large volume of water under the conditions as they exist at the time of construction. If the jury could find from the evidence that at that time a person could have reasonably anticipated that damage from rolling rocks would occur in the vicinity of the breaks, then defendants could be charged with lack of due care. If, however, the occurrence was' so unusual or so unforeseeable that a person could not reasonably anticipate the damage which was done, then the issue should not have been submitted to the jury.
The appellant has by appropriate assignment of error challenged the court’s orders in overruling the demurrer and in denying defendants’ motion for non-suit and directed verdict. Moreover, error in refusing to submit requested instructions and in giving inappropriate instructions has also been assigned. We b.elieve the first group of assignments of error can be disposed of by determining whether the evidence is sufficient to sustain the verdict.
Before treating this question, we dispose of defendants’ contention that the damage done by the large rock was brought about by such a sequence of unusual events and circumstances that careful construction would not have protected the line. The term “construction” as herein used means more than one design and fabrication of the conduit —it includes as well the precaution taken to shield it from anticipated damage. It might be that if this were the only break we could say as a matter of law that defendants were not negligent and that the large rock bounding down the hill and striking the pipe as it did was, in effect, a vis major. However, the evidence was such that the jury could have reasonably found that the water escaping through the smaller break did the damage. Taking this view of the evidence we need not concern ourselves with discussing the defendants’ duty to protect against damages from a major catastrophe.
The evidence concerning the courses taken and the damage done by the smaller rocks did not establish an unusual occurrence in the sense that the angle of fall was unexpected, that the weights of the rocks were excessive, or that reasonable protective measures had failed in their purpose. The damage to the pipe was on the side near the cliff. There was no evidence that the rocks came bounding down the hill in large or excessive bounds and there is no reason apparent from the record that would lead us to believe that had the line been covered at that place where the conduit was broken, the rocks would not have rolled over it without damage. Therefore, if the defendants could be charged with reasonably anticipating that rocks rolling in that immediate vicinity might damage their pipe line and permit water to escape which would cause injury to property owners below, the jury could find them negligent in failing to bury the conduit.
There is evidence in the record from which the jury could conclude not only that defendants could have reasonably anticipated that rocks would damage the pipe line but also that defendants were charged with knowl
edge that this was an area in which rocks periodically rolled down the mountainside. For more than thirty five years, rocks have rolled from ledges in the vicinity of the breaks onto the highway below. Every spring, according to the witnesses, rocks varying in size from some approximately the size of the human hand to boulders weighing many tons have rolled down in that vicinity. While it is true that they have not always rolled down in the same spot, witnesses always fixed the places at which rocks had rolled down as being in the vicinity of the breaks.
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LATIMER, Justice.
On the 28th day of February, 1946, plaintiffs’ home in Ogden Canyon was damaged by a large volume of water which flowed across their property and through their house. Their furniture, fixtures and clothing were damaged by the water and large quantities of mud and silt were deposited on the floors of their home. The water had escaped from a seventy five foot wood stave pipe line used by the defendants to divert water from Pineview Dam for power and irrigation purposes. In the action commenced in the court below, the matter was tried before a jury which found in favor of plaintiffs and from the judgment entered upon
its verdict, defendants have appealed. We shall refer to the parties as they were designated in the trial court and the testimony will be viewed in a light favorable to respondents.
In 1935 pursuant to a contract between defendants and the United States of America a seventy five foot wood stave pipe line was constructed to carry water down Ogden Canyon. The conduit was installed on a right of way owned by defendant, Utah Power and Light Company, and for all practical purposes was to be aligned, graded and buried substantially the same as a line which was being replaced. The plans and specifications for the installation were subject to the approval of the Power Company and the work was to be done to its satisfaction. Since its installation the line has been used and maintained by the defendants jointly.
On the night in question, the pipe was broken in two places. The larger of the two breaks was on the west and the smaller on the east. From the position of the rocks after the break, it appears that the damage on the west was caused by a boulder estimated to weigh nine tons while that done on the east by one or two rocks of approximately two by two by three feet in size. Both breaks were of sufficient size to permit a large volume of water to escape according to witnesses who estimated the hole on the east to be four feet by two feet in size. The pipe had been covered with some dirt at the point where it was damaged on the west but was uncovered at the other place of damage.
The conduit had a carrying capacity of 320 cubic feet per second and at the time of the break the flow was about one half this volume. The line ran in an easterly-westerly direction down the canyon and, in the vicinity of the breaks, was at a higher elevation than the highway and homes built and occupied by people living in that area. There was a river bed in the bottom of the canyon which would canalize the water once it reached that level, but plaintiffs’ home was between the conduit and the stream bed.
Winter snow had fallen and the state highway department in clearing the main travelled portion of the highway had banked the snow on the shoulders of the road. These snow banks confined the water that had escaped through the breaks and as it coursed down the canyon. Apparently the first point at which the water could escape from the highway was in close proximity to plaintiffs’ house and as a result, the course of the water after leaving the road bed was through the plaintiffs’ home.
There are rocky cliffs about one half mile north of the places where the pipe was broken. They are steep, rugged and nearly perpendicular at that distance. While the intervening territory is not nearly so steep, the slope continues to the south and once a boulder starts rolling there is little to stop or retard its speed until it reaches either the highway or the river bed.
Before concentrating on detail it may be well to place the principle issue in a large perspective. This issue affects the question of determining what is due care in the construction of a conduit designed to confine a large volume of water under the conditions as they exist at the time of construction. If the jury could find from the evidence that at that time a person could have reasonably anticipated that damage from rolling rocks would occur in the vicinity of the breaks, then defendants could be charged with lack of due care. If, however, the occurrence was' so unusual or so unforeseeable that a person could not reasonably anticipate the damage which was done, then the issue should not have been submitted to the jury.
The appellant has by appropriate assignment of error challenged the court’s orders in overruling the demurrer and in denying defendants’ motion for non-suit and directed verdict. Moreover, error in refusing to submit requested instructions and in giving inappropriate instructions has also been assigned. We b.elieve the first group of assignments of error can be disposed of by determining whether the evidence is sufficient to sustain the verdict.
Before treating this question, we dispose of defendants’ contention that the damage done by the large rock was brought about by such a sequence of unusual events and circumstances that careful construction would not have protected the line. The term “construction” as herein used means more than one design and fabrication of the conduit —it includes as well the precaution taken to shield it from anticipated damage. It might be that if this were the only break we could say as a matter of law that defendants were not negligent and that the large rock bounding down the hill and striking the pipe as it did was, in effect, a vis major. However, the evidence was such that the jury could have reasonably found that the water escaping through the smaller break did the damage. Taking this view of the evidence we need not concern ourselves with discussing the defendants’ duty to protect against damages from a major catastrophe.
The evidence concerning the courses taken and the damage done by the smaller rocks did not establish an unusual occurrence in the sense that the angle of fall was unexpected, that the weights of the rocks were excessive, or that reasonable protective measures had failed in their purpose. The damage to the pipe was on the side near the cliff. There was no evidence that the rocks came bounding down the hill in large or excessive bounds and there is no reason apparent from the record that would lead us to believe that had the line been covered at that place where the conduit was broken, the rocks would not have rolled over it without damage. Therefore, if the defendants could be charged with reasonably anticipating that rocks rolling in that immediate vicinity might damage their pipe line and permit water to escape which would cause injury to property owners below, the jury could find them negligent in failing to bury the conduit.
There is evidence in the record from which the jury could conclude not only that defendants could have reasonably anticipated that rocks would damage the pipe line but also that defendants were charged with knowl
edge that this was an area in which rocks periodically rolled down the mountainside. For more than thirty five years, rocks have rolled from ledges in the vicinity of the breaks onto the highway below. Every spring, according to the witnesses, rocks varying in size from some approximately the size of the human hand to boulders weighing many tons have rolled down in that vicinity. While it is true that they have not always rolled down in the same spot, witnesses always fixed the places at which rocks had rolled down as being in the vicinity of the breaks. Moreover, previous conduits that had been located along the same or nearly the same contour line had twice been broken in practically the same spot. Some 25 years earlier, the pipe line of the Power Company which had been replaced by the present installation was broken, and from other evidence, the jury could have reasonably found that the present line had been broken on one prior occasion some two years before the present breaks occurred. The city conduit, which was a much smaller line, had been broken in the same spot some 17 years before and in that general vicinity many times. As a matter of fact, because of its past experience, the city buried its line across this area to protect it.
We do not pause to detail all the evidence given by all witnesses for the reason that in viewing the record as a whole we are convinced there is evidence from which the jury could reasonably conclude that the defendants could anticipate damage to its line by rolling rocks in that immediate vicinity.
Appellants argue that the principles of law announced in the case of
Logan, Hyde Park & Smithfield Canal Company
v.
Utah Power and Light Company,
45 Utah 491, 146 P. 560, 561, support their contention that they could not reasonably foresee the damage that occured. Our inquiry in this connection is whether there is a difference in the facts concerning the reasonableness of anticipating damage to the line. In that case the Power Company constructed a wooden flume along a mountain side. Above the canal were many
rocks and boulders. The rock or rocks doing the damage in that case were started rolling by a third person and in the 12 years time the flume had been installed it had not been injured by rolling rocks. Mr. Justice Frick writing for this Court announces reasonable foreseeability as the test. In the decision he states:
“It seems to us this contention is sound. True, plaintiff’s counsel contend that, in view that there were many large boulders and loose rocks along the steep incline on the mountain side above the flume, it was the defendant’s duty to guard against injury to its flume from any of the rocks that might become dislodged and roll down the mountain side. According to plaintiff’s own evidence, however, such a danger or contingency was quite remote. The evidence is conclusive that the wooden flume was in operation for at least 12 years before the rock in question struck and injured it. Is it negligence not to foresee and guard against the consequences of an occurrence of the character in question here, which happens only once in 12 years, and may not occur again or is it any evidence of negligence? If such he the law, then the only method by which the defendant can make itself immune against suits for damages caused by rocks that may roll down the mountain side and which case injury to its flume, and may thus result in causing the water flowing therein to cause damages, is to remove all the rocks that are along the mountain side above the flume, or build the flume into the mountain side and cover it over so that no rocks could possibly injure it. The latter is what plaintiff’s counsel suggests defendant should have done. To require that seems quite unreasonable.”
There was no evidence in that case of any prior damage to the flume and the general rule is that one need not anticipate that strangers will put forces in action to injure or destroy property. But the rule does not go so far as to say that when, over a period of years, rocks have rolled down the mountain side and have damaged pipe lines in the same locality, that one may not then be charged with knowledge that its pipe line which is installed above the surface might be damaged by the rocks that are periodically broken from ledges above by the elements. Under the facts of that case the court held that as a matter of law the defendant was not negligent in not foreseeing the damage to be guarded against. Here, however, there was evidence
upon which a contrary finding might be based. We hold that under the facts present, all reasonable men need not conclude that damages, such as were done to the pipe line in this instance, could not be reasonably forseen. Thus the determination of due care on the part of the defendants in this case was properly submitted to the jury.
Defendants urge that they were not negligent because the engineer in charge of construction testified that the pipe line was constructed in accordance wth specifications, which was prepared in accordance with the best engineering practice. It may be that in certain cases involving technical skills that the judgment of the experts might be controlling. But, if so, this is not such a case. The judgment of the technician can be questioned by the visible evidence on the ground. Any person travelling regularly through Ogden Canyon would see those places where rocks rolled on the highway. If the presence of rocks or boulders on the highway was frequent and in the same locality and their course passed over defendants’ line, the jury would then have evidence that would tend to contradict the testimony of the engineer that the pipe line was installed in accordance with the best engineering practice. It seems unnecessary to argue that proper engineering standards require a pipe line to be buried if it can be reasonably anticipated that rolling rocks will damage the pipe line and release water to damage property located at lower levels. Moreover, plaintiffs need not produce experts to contradict appellants’ evidence if competent refuting evidence is obtainable from lay witnesses.
In connection with defendants’ negligence it must be remembered that one who, by means of a conduit, controls water, is required to exercise such reasonable care and caution in the construction and operation of the line as would a reasonably careful and prudent man who is acquainted with the size and fall of the conduit; the physical characteristics and features of the surrounding terrain; the proximity of homes; the effect on
the pipe line of snow, rainfall and other climatic conditions; the probability of rocks breaking off and rolling down the country side; and the damage that might result if water does escape.
This court, in the case of
Mackay
v.
Breeze, et al.,
72 Utah 305, 269 P. 1026, 1027, states the rule in this jurisdiction to be as follows:
“* * * One who constructs a ditch or canal and conveys irrigation water through the same must use ordinary care in the construction, maintenance, and operation of such ditch or canal. The degree of care required to prevent the escape of water is commensurate with the damage or injury that will probably result if the water does escape. Such is the rule of law repeatedly announced in this jurisdiction and generally established in America and England when applied to ditches and canals. * * *”
What might be ordinary care in constructing a pipe line through flat, open and unpopulated areas might be gross negligence if the same standards of construction were used to install one along a rocky mountain side where rocks were known to roll with a rapid fall and where the slope of the land was toward residential areas. It is in the latter surroundings that we cast the facts of this case and it was for the jury to say whether the construction met the tests of reasonable care.
Defendants have attacked the correctness of six instructions given by the trial court. The only assignment of error dealing with the instructions which we believe merits discussion is the one which charges that the judge committed error when he, in instruction number seven, withdrew from the jury the alleged negligence of defendants in improperly maintaining the pipe line and yet referred to this ground of negligence in other instructions. If the following phrases used by the court
“the law requires the defendants so doing to use ordinary judgment, skill, care and caution in the construction of that pipe line and in the use of the pipe line for the coursing of water”
and
“the defendants were under a duty to use the same care which an ordinary prudent man would use in the construction and operation of the pipe line;”
are isolated and torn from context, they might be interpreted as contended for by appellants. However, negligent maintenance encompasses different elements than either negligent use or negligent operation, and the court in using the latter terms was not referring to the physical condition of the installation but rather to coursing a large volume of water through the pipe while there was danger from breakage. Regardless of the manner in which the conduit was installed there could have been no damage done to plaintiff had not defendants been using the water course at the time of the break. When the instructions are considered together they do not incorrectly state the law or become confusing.
We find no error in the court’s refusal to submit to the jury defendants’ requested instructions one, nine and fourteen. Number one was a request for a directed verdict and this contention has already been disposed of. Number nine was a request to the effect that if the jury found the rock which caused the break was part of a cliff which was approximately one half to one mile distant from the pipe line the jury must return a verdict for defendant. Our previous discussion disposes of this contention.
Instruction number fourteen sought to shift the blame from these defendants because of the presence of snowbanks along the shoulders of the highway. While these banks may have contributed to canalizing the water down the highway, they were not a new or independent cause which would relieve defendants of the duty to exercise ordinary care. It is most difficult to assume that the acts of the state agents in clearing the road of snow was negligence but even were we so to do the assumed negligence would only be a concurring cause of the damage.
The judgment is affirmed. Costs to respondents.
WADE, WOLFE, and McDONOUGH, JJ., concur.