Plaintiff commenced the action below to recover from the defendants their pro rata •share of the expenses for the operation and •maintenance of a canal which the parties •used jointly. The case was tried to the •court without a jury and from an adverse .judgment the defendants appeal.
The plaintiff corporation operates and ^maintains the Gunnison-Fayette Canal ■which diverts water from the Sevier River at a point approximately one and one-half miles northwest of the community of Axtel, Utah, and conveys the water so diverted in a general northerly direction to the east of and paralleling the Sevier River for approximately 15 miles where the canal terminates in the Sevier Bridge Reservoir. The water conveyed by the canal was, at all times herein material, distributed by the plaintiff to its stockholders under water rights owned by it, and under private rights owned separately by some of its individual stockholders. The latter were known as Class AA rights.
The two defendants, stockholders in plaintiff corporation, received water under both of the above rights. The action below, however, concerned only that water which was distributed to the defendants during the year 1956 under their Class AA rights. The action was brought primarily for the purpose of establishing plaintiffs right to contribution from the defendants, as joint users of the canal, for their Class AA water rights’ proportionate share of the costs for the maintenance and operation of the canal. Plaintiff founded its action upon Title 73, Chapter 1, Section 9, Utah Code Annotated, 1953, which provides:
“When two or more persons are associated in the use of any dam, canal, reservoir, ditch, lateral, flume or other means for conserving or conveying water for irrigation of land or for other purposes, each of them shall be liable to the other for the reasonable expenses of maintaining, operating and controlling the same, in proportion to the share in the use or ownership of the water to which he is entitled.”
Defendants’ proportionate share for the year was computed, as were those of all other persons receiving water from the canal, on the basis of the amount of water each received as it related to the total cost of operating the canal. This charge *156amounted to $1 per acre foot of water delivered.
Defendants by way of an affirmative defense claimed that the statute was not applicable by reason of an alleged agreement which the plaintiff had entered into with the defendant, Howard Roberts, on February 28, 1931, whereby Roberts was permitted to carry his Class AA water through the canal for the sum of $35 per year, conditioned upon Roberts granting a ten per cent interest in his water right in favor of the owners of the Sevier Bridge Reservoir in order that plaintiff could acquire storage rights therein at a reduction of only three per cent of its own water. Defendant Malmgren was made a defendant in the suit because he was the successor from various persons to a portion of the original Roberts’ right covered by the alleged agreement. Defendants further alleged estoppel as an affirmative defense in that the contract had been recognized and acted upon by the parties for over 20 years.
Defendants admitted that no formal contract covering the agreement had been executed by the parties, but claimed that the contract was sufficiently evidenced by the general adjudication on the Sevier River known as the Cox Decree, by notes taken by defendant Roberts while he was the plaintiff’s secretary, and by a minute entry in plaintiff’s corporate minute book. The portion of the minute entry upon which defendants rely reads as follows:
“Motion by W. J. Gribble and Seconded by Elijah James. That the board accept the proposition of Howard Roberts to let him run his ljío s. f. of water less 10% of the same, in the Fay-ette Canal permanently for the sum of $35.00 per year. That the 10% is to go-to the Sevier Bridge Reservoir for the credit of the Fayette Canal Company as agreed by Howard Roberts ag part consideration for the Canal Company getting storage rights in said reservoir for 3% of the Fayette Canal Company water instead of 10%.”
These minutes were written at the direction of the defendant Roberts who was then secretary and managing agent of the plaintiff corporation; and which position he-held throughout the period 1928 to 1956. The notes upon which the defendants rely were written by Roberts personally. Although both the minute entry and the notes tend to support the existence of the alleged agreement, as they presently appear, the-notes show signs of having been altered', by various erasures and insertions, and the minute entry appears to have been erased, and rewritten in a different handwriting. And the altered portion of the minute entry was also rewritten in a different color of' ink from that of the unaltered portion..
In its reply to the defendants’ answer,, plaintiff denied that the claimed agreement had been made and alleged that the portion, of the minute entry in question had been. *157changed at the direction of Roberts to falsely show that the alleged agreement between the plaintiff and Roberts had been entered into at a board of directors meeting held on February 28, 1931. In support of this allegation plaintiff, during the course of trial, called several witnesses. J. Percy Goddard, a handwriting expert, testified that the portion of the minute entry herein-before set out had been erased with ink eradicator and rewritten in a handwriting different not only from that of the unaltered portion of the minute entry, but different from any other handwriting in the minute book as well. Goddard further testified that the altered portion of the minute entry was in the same handwriting as that which appeared on a letter marked as Exhibit No. 7 at the trial. This same letter was later identified by a subsequent witness as having been written by Howard Roberts’ second wife, to whom he was married from 1936 until 1941. Plaintiff also called as a witness Elgin Mellor who was a director, and was present at the board of directors meeting on February 28, 1931. Mellor testified that the agreement arrived at in the meeting was to the effect that Roberts could convey his water through the canal upon condition that he pay to the plaintiff, rather than to the owners of the Sevier Bridge Reservoir as Roberts had claimed, 10% of his Class AA water right and $35 per year. Mellor also testified that the agreement decided upon was to be temporary from year to year.
On the basis of this evidence, the trial court found that the agreement as alleged had not been entered into and that instead the arrangement agreed upon had been temporary from year to year. Such a determination, when based upon conflicting evidence such as that which appears in this record, will not be upset unless it manifestly appears that the court has misapplied proven facts or made findings clearly against the weight of evidence. Cole v. Parker, 5 Utah 2d 263, 300 P.2d 623. We find no such error with regard to this finding.
In the absence of an enforceable agreement between joint users of a canal specifying the rights and obligations of the parties with respect to the payment of the canal’s expenses, the statute (section 73-1-9, U.C.A.1953) is controlling.1
Defendants next contend that in any event they are liable for contribution for only that portion of the canal which was used to convey their water. They contend that the court erred in holding *158them liable for contribution for the entire length of the canal when they used only some six miles of the 15-mile canal. With this contention we cannot agree. Section 73-1-9, U.C.A.1953, defines the basis upon which contribution is to be determined as being “ * * * in proportion to the share in the use or ownership of the water to which he is entitled.” Nothing in the foregoing section limits the proportionate share to only that portion of the canal used •to convey the water. The statute bases the right to contribution upon the me or ozvn-«ership of the water and not upon the proportion of the canal used. If the legislature intended by this statute that contribution should be based upon the proportionate share of the expenses for only that portion of a canal used for conveying the water of the joint user, such intent is not apparent from the language used. Furthermore, •apportionment based upon the proportion of a canal actually used would place an impossible burden upon those responsible for making such an apportionment. This ■conclusion is also supported by the not •uncommon practice among water users of .a canal to sell or lease their water to other users along the canal. The record shows ■that the defendant Roberts, as an example, had for years followed just such a practice. To require apportionment under such circumstances would be unduly burdensome, impractical and unworkable.
A more troublesome problem is that presented by the defendants’ assignment of error with regard to the expenses for which they were held liable. They claim that as joint users of the canal they should not have been held proportionately liable for the total expenses of the plaintiff corporation, but rather, that their liability should extend only to those expenses which directly relate to the operation of the canal itself. They take particular exeeption to being held liable for any share of the purely administrative or corporate costs of the plaintiff, or for those costs which are based upon the projection of future canal improvements.
Plaintiff on the other hand, takes the position that all of the expenditures made by the company in 1956 were related to the operation and maintenance of the canal and that the defendants, therefore, were properly held proportionally liable for them. Plaintiff claims that under Section 73-1-9, supra, which states that with respect to joint users of a canal, each “* * shall be liable to the other for the reasonable expenses of maintaining, operating and controlling the same * * that the basis of the defendants’ liability clearly extends to all such expenses as the cleaning, repair and maintenance of the canal and the installation of measuring devices, as well as to the services of the plaintiff’s officers and watermaster in administering the canal.
*159This court has on several occasions been faced with the general problem of making a proper assessment to defray the cost of distributing the waters of an irrigation system.2 Although the prior cases dealt only with assessments which were levied to defray the salary and expenses of water commissioners under Section 73-5-1, U.C.A.1953, rather than with an assessment based upon the right of contribution under Section 73-1-9, we believe that the rule which we adopted in those cases sets out the proper basis for an assessment in the situation with which we are here concerned as well. In Utah Power & Light Co. v. Richmond Irrigation Co., 115 Utah 352, 204 P.2d 818, 824, we stated the rule thus:
“Restating that mathematical exactness is not necessary for a valid assessment, and that the rule is — there should be a reasonable relationship between the proportion of the cost of distribution to be individually borne and the benefits and services to be received, we think an assessment should be levied against the Paradise Company on the same basis as that used to determine the levy imposed on other users.” (Emphasis ours.)
Under this rule, it was error to hold the defendants proportionally liable for the total expenses of the plaintiff corporation, since a number of the expenditures had no relation to benefits received by the defendants whatsoever. The following expense items had no such reasonable relation to the distribution of the defendants’ water as would justify their inclusion:
(1) Legal fees in filing a protest for and in behalf of the plaintiff corporation against a well application by a man by the name of Hansen.
(2) $203.73 for interest on a note at the Gunnison Valley Bank.
(3) $233.59 paid to the Utah State Engineer by Gunnison-Fayette Canal Co., based solely on the amount of water delivered to the Canal Co.
Inasmuch as the plaintiff has the burden of showing that all expenses for which contribution is sought are reasonably related to the cost of distributing the defendants’ water, any expenses which do not affirmatively appear to be so related must be excluded. The above items are either clearly unrelated to the cost of distributing the defendants’ water or do not affirmatively appear to be so related.
*160With respect to the inclusion of the expenditures for the rental of halls for stockholders and board of directors meetings, for the bond for the treasurer of the corporation and for the services of the water-master and other officers of the plaintiff, we believe them to be sufficiently related to the distribution of defendants’ water to be properly included; as are those based on the projection of future canal improvements.
Incidentally, the lower court’s finding that plaintiff was the sole owner of the canal must be set aside. This conclusion is compelled by the admission of plaintiff’s counsel during the course of trial that the plaintiff was not owner of more than an undivided one-half interest in a portion of the canal and by the lack of any other evidence in the record which would support such a finding. However, this conclusion does not affect the judgment of the trial court with respect to the defendants’ liability for their proportional share of the canal’s expense.
The judgment of the trial court is affirmed as modified by items (1), (2) and (3) above.
HENRIOD and CALLISTER, JJ., concur.. West Union Canal Co. v. Thornley, 64 Utah 77, 228 P. 199; Perry Irrigation Company v. Thomas, 74 Utah 193, 278 P. 535; Hodges Irrigation Co. v. Swan Creek Canal Co., 111 Utah 405, 181 P. 2d 217; Peterson v. Sevier Valley Canal Co., 107 Utah 45, 151 P.2d 477.
. Bacon v. Gunnison Fayette Canal Co., 75 Utah 278, 284 P. 1004; Bacon v. Plain City Irr. Co., 87 Utah 564, 52 P.2d 427; Minersville Reservoir & Irr. Co. v Rocky Ford Irr. Co., 90 Utah 283, 61 P.2d 605; Utah Power & Light Co. v. Richmond Irr. Co., 115 Utah 352, 204 P.2d 818.