OPINION
This case involves a builder of a Central Arizona Project (CAP) Canal who allegedly diverted flood rainwater onto the real property of Darrell and Deryll Taft, John B. Fowler, and Jack Compton Development (appellants).
Taft, Fowler and Compton appeal from summary judgment in favor of Ball, Ball and Brosamer (BB & B), the builder, on the issues of strict liability, trespass, negligence and causation. We hold that summary judgment on the issues of strict liability and trespass was proper, but reverse the judgment on the issues of negligence and causation.
*174 PACTS AND PROCEDURAL HISTORY
BB & B contracted with the United States Bureau of Reclamation to build a portion of the CAP known as the Sаlt-Gila Aqueduct. Pursuant to this contract, BB & B was to construct a portion of the CAP known as Reach IB. Reach IB is located in southeastern Maricopa County. It begins northwest of University and Ellsworth Roads in the City of Mesa and continues in a southeasterly direction, terminating in the proximity of Meridian Road between Baseline Road and Southern Avenue.
The drainage area of the Salt-Gila Aqueduct above Reach IB includes approximately 35 square miles of mountains and desert sloping generally to the southwest. Reach IB runs perpendicular to the natural slope of the ground and intercepts the natural water courses.
The canal is bounded by earthen berms or levees. On the upslope side of the canal, the levee acts to prevent waters from flowing into the canal. There is a collector ditch on the outside of the upslope berm which runs parallel to the canal. When completed, the canal is designed to minimally interfere with the natural drainage of waters. This is accomplished by twelve overchutes and two flumes. The collector ditch will channel water to the overchutes. The overchutes then will carry the water over the canal and deposit it on the other side. The design and placement of these overchutes is intended tо approximate the natural flow of water before the construction of the canal.
On about July 17-18, 1984, a severe rainstorm occurred in the East Mesa/Apache Junction region of Maricopa County. Reach IB, while still under construction, filled to capacity and overtopped at its lowest point, flоoding appellants’ and other property. Twelve separate plaintiffs originally brought suit against BB & B, alleging strict liability, trespass and negligence. The cases were consolidated and BB & B filed motions for summary judgment on the issues of strict liability and trespass, and on the issues of causation and negligence. The trial court grаnted BB & B’s motions on all four issues. Subsequently, all but three plaintiffs settled. The remaining plaintiffs appealed from the summary judgment on each of the four issues.
I. STRICT LIABILITY
Appellants argue that
Schlecht v. Schiel,
[H]e may not cast the natural flоw of a stream onto the land of his neighbor who is under no duty or obligation to receive the same. Negligence, wilfulness, or wantonness are utterly immaterial to the right to recover compensatory damages if plaintiffs’ premises were not subject to an easement for the flow of the stream, and defendants did not divert the waters onto such premises as of right. The “wilfulness” required for recovery here is simply that the maintenance of the means of diversion be wilful, that it be the willed act of defendants; it is immaterial that they did or did not will the later damage that resulted.
In reliance upon
Schlecht,
and the above cited cases, appellants argue that BB & B should be held strictly liable because it diverted the natural flow of water onto appellants’ land and appellants were under no duty or obligation to receive the water. They further argue that because the act of building Reaсh IB was wilful, it is immaterial that BB & B did not intend the resulting damage. Arizona law appears clear as to the application of strict liability in water canal cases such as this. Thus, we believe that BB & B is not subject to strict liability
*175
because of the Arizona Supreme Court’s reasoning in
Ramada Inns v. Salt River Valley Water,
In
Ramada Inns,
suit was brought against the Salt River Valley Water Users’ Association and others for damage caused by flooding of the Arizona Canal. In determining that strict liability did not apply, the supreme court set forth two rationales. First, the continued utility and necessity of the Arizona Canal is “indispensable for the maintenance of life and prosperity.”
Id.
at 68,
Appellants focus on the word “continued” in the phrase “continued utility and necessity.” They argue that because Reach IB was under construction at the time of flooding, it has not been around long enough to be immune from the strict liability
Ramada Inns
afforded the Arizona Canal. We disagree. Arizona’s prаctice of extending immunity to canals is long-standing. In
Salladay v. Old Dominion Copper Co.,
Not only flumes, but irrigation ditches, large and small, similar in purposе, construction, and use, and equally dangerous and alluring to the child, are to be found throughout the territory wherever cultivation of the land is carried on, and such conduits, practically impossible to render harmless, are indispensable for the maintenance of life and prosperity.
In
Dombrowski v. Maricopa County Municipal Water Conservation District No. 1,
This court has built upon and extended the Salladay decision to provide almost complete immunity to irrigation districts in Arizona in the maintenance not only of the сanals and diversion points, but also various mechanical and electrical equipment needed to operate the water distribution system.
The CAP, like other canals, is indispensable for the maintenance of life and prosperity in Arizona; therefore, we hold that immunity from strict liability extends to the CAP during its construction. The CAP еnabling legislation clearly makes this point:
The legislature declares and finds:
1. That the development of an adequate supply of water for agriculture, municipal, industrial and fish and wildlife uses within the state of Arizona is vital for the well being, health and prosperity of the people of the state.
2. That the state’s right and obligation to receive two million еight hundred thousand acre feet of main stream Colorado river water annually having been confirmed by the United States supreme court in Arizona v. California,376 U.S. 340 (1964) it is essential to the continued well being, health and prosperity of the people of the state that the state proceed promptly to establish, devеlop and execute an appropriate program for the development and utilization of such water.
A.R.S. § 45-1701. Public policy mandates that strict liability not apply in the construction phase of the CAP.
Second, appellants argue that the longevity of the Arizona Canal was the determining factor in deciding that it had taken on the characteristics of a natural water course, thus precluding the use of strict liability. It is true that the court in Ramada Inns made reference to the long-standing existence of the Arizona Canal as a factor in support of its decision, but the basic analysis is not dependent upon the longevity of the canal. The Arizona Supreme Court set forth three criteria to be considered in determining whether an arti *176 ficial waterway can be considered a natural watercourse:
(1) whether the way or stream is temporary or permanent;
(2) the circumstances under which it was created;
(3) the mode in which it has been used and enjoyed.
For the foregoing reasоns, we affirm the summary judgment on the issue of strict liability.
II. TRESPASS
Appellants’ claim of trespass is based upon Restatement (Second) of Torts § 158, “Liability for Intentional Intrusions on Land,” which states in pertinent part,
One is subject to liability to another for trespass, irrespective of whether he thereby causes harm to any legally protected interest of the other, if he intentionally
(a) enters land in the possession of the оther, or causes a thing or a third person to do so ... [Emphasis added.]
Nothing in the record supports the contention that BB & B intentionally caused the flooding of appellants’ property. Because the requisite intent was not present, summary judgment on the issue of trespass was proper.
III. NEGLIGENCE
Summary judgment is generally improper in negligence actions.
Boozer v. Arizona Country Club,
In the present case, reasonable minds could reach different conclusions as to the existence of a genuine issue of fact regarding negligence. An expert testified that after Reach IB was completed, the canal could handle water from a three-hour, 100-year rainstorm. This same expert testified that, during construction, a canal should be able to handle runoff from rainstorms approximating a 25-year storm. The rainstorm involvеd in this case was approximately a three-hour, 20-year storm, yet the canal held only 40% of the total runoff collected in the canal. Thus, only 264 acre feet of runoff was stored in the aqueduct, while 405 acre feet of runoff overflowed the aqueduct, most of it flowing onto appellants’ property. 1
Additionally, reasonable persons could differ as to whether it was reasonable for BB & B to have all overchutes blocked off during construction of the canal. Concerning this issue, appellants argue that BB & B’s contract with the United States to provide overchutes creates a higher standard of care on its part than that of reasonable care. We disagree.
*177
BB & B’s contract with the government to supply overchutes creates no greater duty than the common-law duty of reasonable care.
Summitt County Development Corp. v. Bagnoli,
Further, reasonable jurors could differ as to whether it was reasonable for BB & B not to have taken some type of precaution to insure that water overtopping the canal would flow into a natural waterway rather than flooding private property. An expert testified that it was a reasonable plan to collect water in the canal in case of a storm, as long as a study was made as to where flood waters would overtop the canal and flow into natural water courses. BB & B knew the location of the lowest point of the berms and levees, yet did nothing to protect the private landowners over and above hoping that the canal would not fill to capacity and overtop before construction of the overchutes was completed.
Finally, there is a genuine dispute as to whether it was a premeditated plan on the part of BB & B to use the canal as a storage reservoir оr whether it was merely an afterthought contrived during the course of litigation.
Thus, there are genuine issues of material fact upon which reasonable jurors could differ on the issue of negligence.
IV. CAUSATION
While BB & B contends that it was not negligent, it alternatively argues that appellants have failed to show that the alleged acts оf negligence were the proximate cause of appellants’ injuries. In discussing whether the trial court properly granted summary judgment on the issue of causation, we start with the premise that
[t]he question of whether a defendant’s negligence is the proximate cause of an injury is one of fact to be submitted to the jury and not a question of law for the court, if, upon all the facts and circumstances there is a reasonable chance or likelihood of the conclusions of reasonable men differing.
Hersey v. Salt River Valley Water Users’ Ass’n,
In
Markiewicz v. Salt River Valley Ass’n,
If appellants would have suffered exactly the sаme damages in the absence of the Association’s negligent acts, the Association would not be liable, obviously. Restatement (Second) of Torts, § 432(1) and Illustration 2 (1965). But if the Association’s negligent acts were a cause of some part of appellant’s damages, the Association would be liable for at least the damages it caused.
Id.
at 338,
Although the evidence was conflicting, a jury could find that the flood waters escaping the canal possessed greater volume and greater kinetic force than they would have had absent the Association’s negligence, and that this contributed to appellant’s injuries.
Id.
at 339,
In the present appeal, the experts agreed that appellаnts’ land would have been flooded to some extent absent any construction on Reach IB. It is also conceded that appellants have not shown a specific dollar amount of damage sustained over and above that which they would have received, absent the Reach IB construction activity. But appellants have shown that they received a greater amount of water and a greater flow rate of water than they would have received absent the construe *178 tion. An expert testified that “more water usually means more damage,” and that “generally the flood damage curves[,] one develoрs[,] goes up with increased discharge.”
As in Markiewicz, a jury could conclude that more water flowing at a greater rate contributed to appellants’ damages. Therefore, in our opinion, there is sufficient evidence of causation in the record to preclude summary judgment on causation. For the above reasons, we reverse the summary judgment on the issue of causation.
CONCLUSION
The public policy of Arizona requires that we sustain the trial court’s summary judgment in favor of BB & B on the issue of strict liability. We also affirm summary judgment to BB & B on the issue of trespass. However, we reverse the summary judgment on the issues of negligence and causation, and remand for further proceedings consistent with this opinion.
Notes
. While these facts and figures are disputed to some degree among various experts, we must accept the facts in the light most favorable to appellants.
City of Phoenix
v.
Space Data Corporation,
