improve the cost-effectiveness of the projects. (e) Nonreimbursability of costs All costs incurred by the Secretary in carrying out this section shall be nonreimbursable. (f) Funding (1) Federal obligation The total amount of obligations incurred by the Secretary for planning, design, and construction of the Navajo water development projects in subsections (a) through (j) of this section shall not exceed $198,300,000, except that the total amount of $198,300,000 shall be increased or decreased, as appropriate, based on ordinary fluctuations from June 2014, in construction cost indices applicable to the types of construction involved in the design and construction of the Navajo water development projects. (2) State cost share The State shall contribute $8,000,000 payable to the Secretary for planning, design, and construction of the Navajo water development projects in installments in each of the 3 years following the execution of the agreement by the Secretary as provided for in subsection (b) of section 5. (3) Transfers to Navajo OM&R account Monies made available for the Navajo water development projects but not used for that purpose may, at the discretion of the Navajo Nation, be transferred to the Navajo OM&R Trust Account established by subsection (k). (g) Applicability of the Indian Self-Determination Act (1) In general At the request of the Navajo Nation, and in accordance with the Indian Self-Determination and Education Assistance Act ( 25 U.S.C. 5301 et seq.), the Secretary shall enter into one or more agreements with the Navajo Nation to carry out the activities authorized by this section. (2) Oversight costs Reclamation, or any Federal agency with an intergovernmental agreement with the Secretary pursuant to subsection (a), and the Navajo Nation shall negotiate the cost of any oversight activities carried out by such agencies for each agreement under this section, provided that the total cost for that oversight shall not exceed 4 percent of the total project costs. (h) Conveyance of title to Navajo