Justice ERICKSON
delivered the Opinion of the Court.
This is an appeal1 from a decision of the District Court, Water Division 22 (water court), awarding the United States a reserved water right to the entire flow of water from the Park Center well (the well), with a priority date of May 29, 1936. Appellant Park Center Water District (Park Center) objected to the United States application on the basis of a decree entered by the water court in April 1973. The water court held that the United States was not bound by the 1973 decree, and that Park Center was collaterally estopped from contesting the application of the United States by virtue of the decision of the Interior Board of Land Appeals (IBLA) in 1977 involving Park Center and the United States. Alternatively, the water court found that Park Center was estopped by contract from objecting to the reserved water rights of the United States because of a series of leases between the parties concerning the well. Finally, the water court ruled that the United States had reserved the entire output of the well under the federal reservation of water rights doctrine, and that the reservation antedated any right to the water held by Park Center. Park Center appealed. We affirm.
I.
The essential facts are not in dispute. The Park Center well is located in the watershed of Fourmile Creek, a tributary of the Arkansas River, in Fremont County. The well was originally drilled by the Mutual Oil and Development Company as an exploratory oil and gas well on public land [92]*92in the 1920s, under the Mineral Leasing Act of 1920, 30 U.S.C. §§ 181-193 (1982). The well never struck oil or gas, but it did intercept water under artesian pressure.
Before the well was plugged, the Mineral Leasing Act was amended by the Oil and Gas Conversion Act of 1934 (Conversion Act), 48 Stat. 977, 30 U.S.C. 229a (amended 1976).3
The well was completed as a water-producing well to a depth of 3,216 feet. On September 27, 1934, a forty acre legal subdivision containing the well was withdrawn from the public domain pursuant to Executive Order of Withdrawal dated April 17, 1926 (also known as Public Water Reserve No. 107). The authority for the executive order was section 10 of the Stock Raising Homestead Act, 43 U.S.C. § 300 (repealed 1976). See United States v. City & County of Denver, 656 P.2d 1, 31 n. 47 (Colo. 1982) [hereinafter Denver I].
In June 1935, the artesian water flow from the well was measured at 2.67 cubic feet per second (cfs). The casing of the well was purchased by the United States in 1936 under the provisions of the Conversion Act. Since 1937, Park Center and its predecessor, Canyon Heights Irrigation and Reservoir Company (Canyon Heights), have used the water from the well under a series of leases with the United States.4 Each such lease, including the current twenty-year lease which commenced in 1971, has stated, “The furnishing of water hereunder shall under no circumstances become the basis of a permanent water right.”
II.
Park Center and Canyon Heights filed an application in 1972 in the water court for a water right to the water from the Park Center well. See § 37-92-302, 15 C.R.S. (1973). In 1973, the water court awarded Park Center a water right for 708 gallons per minute (1.58 cfs) for domestic and irrigation purposes, with a priority date of [93]*93January 8, 1938. The United States was not joined as a party, and did not object to the application or award.
In a separate proceeding in 1976, Park Center and Canyon Heights appealed to the IBLA from an adverse decision of the Colorado State Office of the Bureau of Land Management (BLM). The decision awarded the United States an increase under the lease from two cents per thousand gallons of water used by Park Center from the well, to six cents.5 The IBLA affirmed the decision of the BLM. Park Center Water Dist. & Canyon Heights Irrigation & Reservoir Co., 84 Interior Dec. 87 (1979). The opinion stated that “[the Park Center] well and its water are withdrawn from any other disposition, including the attempted disposition under state law.... Finally, [Park Center and Canyon Heights] are es-topped by contract from asserting any sort of permanent water right against the United States.” Id. at 91.6
The United States was joined in May 1979 as a party in Case No. 79CW176 in Water Division 2, pursuant to the McCar-ran Amendment.7 It filed a general application for federal reserved water rights, and state appropriative water rights, in December- 1979, claiming, inter alia:
the entire flow of wells drilled pursuant to oil and gas prospecting permits or leases which produce water and which have been determined to be valuable for water production by the Secretary of the Interior, purchased pursuant to 30 USC 229, and the land subdivision containing the well withdrawn and reserved for public use.
The sources of this claim were described as “all springs, wells, waterholes and other bodies of water located within the boundaries of this Water Division which are needed or used by the public for watering purposes and which are located on the lands described in the applicable reserving documents.”
The application addressed section 37-92-306, 15 C.R.S. (1973),8 and stated that the [94]*94United States was filing the general application in the same year in which it had first been joined in a general water rights adjudication in Water Division 2, in order to preserve the right to antedation.9 The 1979 application also purported to reserve the right of the United States to amend the application “for specific water rights of the United States which are described generally in paragraph 5, above, and will be filed by agency [sic] as the applications are completed.”
The United States claimed that the reason for delay in filing specific applications was the large number of water rights involved, and a lack of time and manpower. In December 1980, the water court entered an order for the assignment of new case numbers for the subsequent specific applications of the United States. The water court ruled in September 1981, however, in Case No. 79CW176, that “[i]n the interest of fairness,” and because of the “very complicated” nature of the case, it had permitted the procedure whereby the United States had amended the 1979 application by more specific filings. Subsequently, in October 1981, the water court held that the applications filed by the United States in the renumbered cases would be considered amendments to the original general application filed in 1979, and that these amendments would relate back to the time of the filing of that first application.10
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Justice ERICKSON
delivered the Opinion of the Court.
This is an appeal1 from a decision of the District Court, Water Division 22 (water court), awarding the United States a reserved water right to the entire flow of water from the Park Center well (the well), with a priority date of May 29, 1936. Appellant Park Center Water District (Park Center) objected to the United States application on the basis of a decree entered by the water court in April 1973. The water court held that the United States was not bound by the 1973 decree, and that Park Center was collaterally estopped from contesting the application of the United States by virtue of the decision of the Interior Board of Land Appeals (IBLA) in 1977 involving Park Center and the United States. Alternatively, the water court found that Park Center was estopped by contract from objecting to the reserved water rights of the United States because of a series of leases between the parties concerning the well. Finally, the water court ruled that the United States had reserved the entire output of the well under the federal reservation of water rights doctrine, and that the reservation antedated any right to the water held by Park Center. Park Center appealed. We affirm.
I.
The essential facts are not in dispute. The Park Center well is located in the watershed of Fourmile Creek, a tributary of the Arkansas River, in Fremont County. The well was originally drilled by the Mutual Oil and Development Company as an exploratory oil and gas well on public land [92]*92in the 1920s, under the Mineral Leasing Act of 1920, 30 U.S.C. §§ 181-193 (1982). The well never struck oil or gas, but it did intercept water under artesian pressure.
Before the well was plugged, the Mineral Leasing Act was amended by the Oil and Gas Conversion Act of 1934 (Conversion Act), 48 Stat. 977, 30 U.S.C. 229a (amended 1976).3
The well was completed as a water-producing well to a depth of 3,216 feet. On September 27, 1934, a forty acre legal subdivision containing the well was withdrawn from the public domain pursuant to Executive Order of Withdrawal dated April 17, 1926 (also known as Public Water Reserve No. 107). The authority for the executive order was section 10 of the Stock Raising Homestead Act, 43 U.S.C. § 300 (repealed 1976). See United States v. City & County of Denver, 656 P.2d 1, 31 n. 47 (Colo. 1982) [hereinafter Denver I].
In June 1935, the artesian water flow from the well was measured at 2.67 cubic feet per second (cfs). The casing of the well was purchased by the United States in 1936 under the provisions of the Conversion Act. Since 1937, Park Center and its predecessor, Canyon Heights Irrigation and Reservoir Company (Canyon Heights), have used the water from the well under a series of leases with the United States.4 Each such lease, including the current twenty-year lease which commenced in 1971, has stated, “The furnishing of water hereunder shall under no circumstances become the basis of a permanent water right.”
II.
Park Center and Canyon Heights filed an application in 1972 in the water court for a water right to the water from the Park Center well. See § 37-92-302, 15 C.R.S. (1973). In 1973, the water court awarded Park Center a water right for 708 gallons per minute (1.58 cfs) for domestic and irrigation purposes, with a priority date of [93]*93January 8, 1938. The United States was not joined as a party, and did not object to the application or award.
In a separate proceeding in 1976, Park Center and Canyon Heights appealed to the IBLA from an adverse decision of the Colorado State Office of the Bureau of Land Management (BLM). The decision awarded the United States an increase under the lease from two cents per thousand gallons of water used by Park Center from the well, to six cents.5 The IBLA affirmed the decision of the BLM. Park Center Water Dist. & Canyon Heights Irrigation & Reservoir Co., 84 Interior Dec. 87 (1979). The opinion stated that “[the Park Center] well and its water are withdrawn from any other disposition, including the attempted disposition under state law.... Finally, [Park Center and Canyon Heights] are es-topped by contract from asserting any sort of permanent water right against the United States.” Id. at 91.6
The United States was joined in May 1979 as a party in Case No. 79CW176 in Water Division 2, pursuant to the McCar-ran Amendment.7 It filed a general application for federal reserved water rights, and state appropriative water rights, in December- 1979, claiming, inter alia:
the entire flow of wells drilled pursuant to oil and gas prospecting permits or leases which produce water and which have been determined to be valuable for water production by the Secretary of the Interior, purchased pursuant to 30 USC 229, and the land subdivision containing the well withdrawn and reserved for public use.
The sources of this claim were described as “all springs, wells, waterholes and other bodies of water located within the boundaries of this Water Division which are needed or used by the public for watering purposes and which are located on the lands described in the applicable reserving documents.”
The application addressed section 37-92-306, 15 C.R.S. (1973),8 and stated that the [94]*94United States was filing the general application in the same year in which it had first been joined in a general water rights adjudication in Water Division 2, in order to preserve the right to antedation.9 The 1979 application also purported to reserve the right of the United States to amend the application “for specific water rights of the United States which are described generally in paragraph 5, above, and will be filed by agency [sic] as the applications are completed.”
The United States claimed that the reason for delay in filing specific applications was the large number of water rights involved, and a lack of time and manpower. In December 1980, the water court entered an order for the assignment of new case numbers for the subsequent specific applications of the United States. The water court ruled in September 1981, however, in Case No. 79CW176, that “[i]n the interest of fairness,” and because of the “very complicated” nature of the case, it had permitted the procedure whereby the United States had amended the 1979 application by more specific filings. Subsequently, in October 1981, the water court held that the applications filed by the United States in the renumbered cases would be considered amendments to the original general application filed in 1979, and that these amendments would relate back to the time of the filing of that first application.10
Finally, on November 29, 1981 (within the March 31, 1982 cutoff date for amendments imposed by the water court), the United States filed the application which specifically claimed federal reserved rights in the Park Center well, for 2.67 cfs of water, with a priority date of May 29,1936. Various parties, including Park Center, filed objections to the application of the United States for reserved water rights in the well.
By decision dated May 7, 1988, the water court awarded the United States a right to the water from the Park Center well. It rejected Park Center’s claim that the United States was bound by the 1973 decree obtained by Park Center without the join-der of the United States.11 Instead, the water court held that Park Center was collaterally estopped from contesting the reserved water rights of the United States in the well because of the unappealed IBLA decision. In addition, the water court found, on the merits, that the United States [95]*95had reserved 2.67 cfs of water from the well. Finally, the United States was held entitled to antedation, with a May 29, 1936 date of priority.12 Park Center was precluded from contesting the priority of the United States by virtue of the terms of its lease. Only Park Center appealed the ruling of the water court.
III.
Both Park Center and the United States agree that Denver I provides the analytical foundation for determining the scope of the federal reserved water right in this case.13 That doctrine was set forth by the United States Supreme Court in Cappaert v. United States, 426 U.S. 128, 138, 96 S.Ct. 2062, 2069, 48 L.Ed.2d 523 (1976):
This Court has long held that when the Federal Government withdraws its land from the public domain and reserves it for a federal purpose, the Government, by implication, reserves appurtenant water then unappropriated to the extent needed to accomplish the purpose of the reservation. In so doing the United States acquires a reserved right in unappropriated water which vests on the date of the reservation and is superior to the rights of future appropriators. Reservation of water rights is empowered by the Commerce Clause, Art. I, § 8, which permits federal regulation of navigable streams, and the Property Clause, Art. IV., § 3, which permits federal regulation of federal lands. The doctrine applies to Indian reservations and other federal enclaves, encompassing water rights in navigable and nonnavigable streams.
Following the decisions of the United States Supreme Court in United States v. New Mexico, 438 U.S. 696, 98 S.Ct. 3012, 57 L.Ed.2d 1052 (1978); California v. United States, 438 U.S. 645, 98 S.Ct. 2985, 57 L.Ed.2d 1018 (1978); and Cappaert, 426 U.S. 128, 96 S.Ct. 2062, we set out the following test for determining the scope of federal reserved water rights:
For each federal claim of a reserved water right, the trier of fact must examine the documents reserving the land from the public domain and the underlying legislation authorizing the reservation; determine the precise federal purposes to be served by such legislation; determine whether water is essential for the primary purposes of the reservation; and finally determine the precise quantity of water — the minimal need as set forth in Cappaert and New Mexico — required for such purposes.
Denver I, 656 P.2d at 20.
The specific documents authorizing the reservation and the legislation authorizing the reservation are Public Water Reserve No. 107,14 section 10 of the Stock Raising [96]*96Homestead Act,15 and the Conversion Act. We have previously held that neither the executive order, nor section 10 of the Stock Raising Homestead Act reserved the entire yield of water from springs or waterholes on withdrawn land:
The federal government’s assertion, therefore, that the entire yield must be reserved is not well-founded. The purpose of the reservation was to prevent monopolization of water needed for domestic and stock watering purposes. The water court correctly ruled that the federal purposes could be satisfied with a quantifiable amount less than the entire yield of the springs and waterholes. The reserved rights doctrine only takes that amount of water “necessary to fulfill the purpose of the reservation, no more.” [Cappaert,] 426 U.S. at 141, 96 S.Ct. at 2070. Here, as the water court found, the necessary amount is less than the entire yield. Reserved water from public springs and waterholes is available for the purposes of human and animal consumption in the amount necessary to prevent monopolization of the water resources.
Denver I, 656 P.2d at 32. Nevertheless, the water court decreed that the United States had reserved the entire yield of the Park Center well. The source of the reservation, therefore, must come from the Conversion Act (not at issue in Denver I), if this case is to be distinguished from Denver I. We have not considered the Conversion Act before, and we have not found any reported judicial decision in any other jurisdiction which has construed the Act.
The relevant portions of the Conversion Act are set out in full in footnote 3. Unlike the reservation documents in Denver I, the Conversion Act deals expressly with the production and leasing of water from wells. For example, subsection (a) provides that “the Secretary of the Interior may, when such water is of such quality and quantity as to be valuable and usable at a reasonable cost for agricultural, domestic, or other purposes,” purchase the well casing for a reasonable value. Subsection (e) states that “[t]he Secretary may make such purchase and may lease or operate such wells for the purpose of producing water and of using the same on the public lands or of disposing of such water for beneficial use on other lands.” Subsection (c) also makes it clear that the owners or occupants of lands adjacent to the well are given a preferential right to the beneficial use of the water.
Finally, subsection (d) explicitly contemplates that the water from the wells be sold to fund the continuation of the program initiated by the Conversion Act: “[T]he [Secretary of the Interior] may use the proceeds from the sale or other disposition of such water as a revolving fund for the continuation of such program, ....”16
We therefore agree with the water court in the conclusion that the United States, by virtue of the Conversion Act, reserved the right to the use of water flowing from the converted wells.17 One purpose of the reservation, as it appears from the Conversion Act, was to provide water for beneficial use on reserved land, and private land adjacent to the reserved land on which the converted wells are located. Another purpose, however, was to sell the water at a reasonable [97]*97cost and to use the proceeds to convert more wells for the program. Unlike the Stock Raising Homestead Act, the purposes of the Conversion Act go beyond preventing the monopolization of water from waterholes. Cf Denver I, 656 P.2d at 32.18
Finally, we must “determine the precise quantity of water — the minimal need as set forth in Cappaert and New Mexico — required for such purposes.” Denver I, 656 P.2d at 20. In June 1935, a year before the well casing was purchased in 1936, the artesian water flow from the well was measured at 2.67 cfs, the same amount the water court found was reserved. The Conversion Act authorized the Secretary to purchase the well casing only if “such water is of such quality and quantity as to be valuable and usable at a reasonable cost for agricultural, domestic, or other purposes,_” (Emphasis added.) It is reasonable to assume that, before deciding to purchase the well casing, the United States took into account the quantity of water flowing from the well under artesian pressure. We therefore decline to overturn the water court’s finding that the United States intended to lease, and therefore reserve, the entire flow from the well, and that the amount of water flow measured in 1935, prior to the purchase, and prior to the lease to Park Center or Canyon Heights in 1937, is no more than the amount of water needed to fulfill the purpose of the reservation.19 Accordingly, we agree with the water court's determination that the United States has reserved a right to 2.67 cfs of water from the Park Center well.
IV.
The last issue is whether the United States is entitled to antedation of its reserved water right in the well. Antedation is appropriate only if the specific application for the use of the water from the Park Center well related back to the original application filed by the United States in 1979, the year in which it was first joined in a general adjudication of water rights that would encompass the Park Center well. See Bell, 724 P.2d at 642. Park Center contends that our decision in Bell forecloses the relation back of the specific amendments in this case. We disagree because we find Bell distinguishable.
In Bell, the United States claimed a right to antedation for a right to use the water from the main stem of the Colorado River. We first held that the water court had properly ruled that C.R.C.P. 15 applied to the adjudication of water court proceedings under the Water Right Determination and Administration Act of 1969, sections 37-92-101 to -602, 15 C.R.S. (1973 & 1988 Supp.). The water court had determined that amendment of the original application of the United States filed in 1971 was proper, and we agreed. Bell, 724 P.2d at 637. But the water court also refused to allow the amendment filed in 1983 to relate back under C.R.C.P. 15(c)20 to the original application filed twelve years before. We concluded that the original application, which did not geographically encompass the main [98]*98stem of the Colorado River, did not adequately advise the holders of 4400 water rights, based on claims adjudicated between 1971 and 1983, that the United States was claiming a right to the use of water from the Colorado River itself. Bell, 724 P.2d at 639.
In the present case, Park Center is not seriously contending that it was not put on notice of the potential claim of the United States in the Park Center well when the United States filed the original application in 1979.21 Rather, Park Center maintains that, when 1980 came and went, and there was no specific application by the United States for a reserved water right to the well, it was justified in concluding that the United States would not claim such a right. This case, therefore, does not present the same unsettling of prior adjudications of water rights as did Bell. We conclude that, under the unique facts and circumstances of this case, the water court did not abuse its discretion in allowing the United States to amend its more general application by a specific application to a reserved water right in the Park Center well, and to allow that amendment to relate back.22
V.
In summary, we affirm the holding of the water court that the United States is entitled to a reserved water right of 2.67 cfs from the Park Center well. In addition, we also affirm the finding of the water court that the priority date of this water right is May 29, 1936.23