43 C.F.R. § 426.6
(a) Conditions that a lease must meet. Districts can make irrigation water available to leased land only if the lease meets the following requirements. Land that is leased under a lease instrument that does not meet the following requirements will be ineligible to receive irrigation water until the lease agreement is terminated or modified to satisfy these requirements.
(2) The lease includes the effective date and term of the lease, the length of which must be:
(b) Nonfull-cost entitlements.
(c) Application of the nonfull-cost and full-cost rates.
(d) Types of lands that count against the nonfull-cost entitlement.
(1) All directly and indirectly owned irrigation land and irrigation land directly or indirectly leased for any period of time during 1-water year counts towards a landholder's nonfull-cost entitlement, except:
(2) Reclamation's process for determining if a nonfull-cost entitlement has been exceeded is as follows:
(e) Selection of nonfull-cost land.
(1) A landholder that has exceeded his or her nonfull-cost entitlement may select in each water year, from his or her directly held irrigation land, the land that can be irrigated at a nonfull-cost rate and the land that can be irrigated only at the full-cost rate. Selections for full-cost or nonfull-cost land may include:
(h) Calculating full-cost charges. Reclamation will calculate a district's full-cost charge using accepted accounting procedures and under the following conditions.
(6) In determining full-cost charges, the following factors will be considered:
(i) Amortization period. The amortization period for calculating the full-cost charge is the remaining balance of:
(ii) Construction costs. For determining full cost, construction costs properly allocable to irrigation are those Federal project costs for facilities in service that have been assigned to irrigation within the overall allocation of total project construction costs. Total project construction costs include all direct expenditures necessary to install or implement a project, such as:
(v) Payments received. In calculating the payments that have been received, all receipts and credits applied to repay or reduce allocated irrigation construction costs in accordance with Federal reclamation law, policy, and applicable contract provisions will be considered. These may include:
(vi) Interest rates. Interest rates to be used in calculating full-cost charges will be determined by the Secretary of the Treasury as follows:
(A) For irrigation water delivered to qualified recipients, limited recipients receiving water on or before October 1, 1981, and extended recordable contract land owned by prior law recipients, the interest rate for expenditures made on or before October 12, 1982, will be the greater of 7.5 percent per annum or the weighted average yield of all interest-bearing marketable issues sold by the Treasury during the fiscal year when the expenditures were made by the United States. The interest rate for expenditures made after October 12, 1982, will be the arithmetic average of:
(1) The computed average interest rate payable by the Treasury upon its outstanding marketable public obligations that are neither due nor callable for redemption for 15 years from the date of issuance at the beginning of the fiscal year when the expenditures are made; and
(2) The weighted average yield on all interest-bearing marketable issues sold by the Treasury during the fiscal year preceding the fiscal year the expenditures are made;
(B) For irrigation water delivered to limited recipients not receiving irrigation water on or before October 1, 1981, and prior law recipients, except for land owned subject to extended recordable contract, the interest rate will be determined as of the fiscal year preceding the fiscal year the expenditures are made, except that the interest rate for expenditures made before October 12, 1982, will be determined as of October 12, 1982. The interest rate will be based on the arithmetic average of:
(1) The computed average interest rate payable by the Treasury upon its outstanding marketable public obligations that are neither due nor callable for redemption for 15 years from the date of issuance; and
(2) The weighted average yield on all interest-bearing marketable issues sold by the Treasury.
(j) Disposition of revenues obtained through full-cost water pricing—(1) Legal deliveries. If irrigation water has been delivered in compliance with Federal reclamation law and these regulations, then: