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001800 16 THE LOWER COLORADO RIVER BASIN PROJECT and archaeologic objects and wildlife on lands withdrawn or acquired for the development of units of the project. The costs of works covered by this section, the allocation of costs among the various project purposes, the benefit-cost ratios of the prin- cipal works and repayment data oil these works are presented after the discussion of section II later in this report. Seetion 105 , Section 105 provides that except as otherwise provided in this act, the. Secretary shall be governed by the Federal reclamation laws. Section 105(c)(1) provides that the Secretary may require that water furnished by the Central Arizona unit shall not be used for the irrigation of lands not having a recent irrigation history, and that its U$e be !wcompanied by recognized conservation measures to protect against losses III transmission. It also gives the Secretary authority to shift water no longer needed for irrigation uses to municipal uses. These provisions emphasize the fact that the Central Arizona unit will provide a supplemental supply for the existing irrigation economy rather tb,an serve as a means of expanding that economy. Section 105(d)(2) is a statement of the manner in which the Secre- tary may exercise the authority to contract delegated by section 9(e) ofthe'Reclamation Project Act of 1939. Section 105(c)(3) is an implementation of the policy of encourag- ing exchanges of water;. the use of exchanges of water supplies as a means of avoiding water rights problems has been successfully em- ployed throughout the West. The Central Valley project in Cali- fornia is a conspicuous example. Water users are concerned with quantity, quality, dependability, and cost of their water supplies, not with the sourceof the supply. This fact makes it possible to extend s,ervice to areas that would not otherwise receive a water supply from the project and to effect service in the most efficient and least costly manner. Section 106 Se~~ionl06!~ovides .that the costs shall be allocated to irrig!1tio!1, mUnICIpal, an llldustrlal water supply, and to power generatIOn ill acc6rdancewith the reclamation laws, These reimbursable costs are to be repaid ~. 50 years plus any development period authorized .by law. See sectIOns 102(e)(1) and 102(e)(2).The repayment perIod is 'the same as that provided in section 40fthe Colorado River Storage Project Act. . . . . Relevant data on allocation of project costs and repayment require- ments are presented in section II later in this report. . Section 107. . Section 107 provides that the costs of irrigation of Indian lands that cannot be paid ~ such lands shall be borne by the Nation, Section 4 of the Colorado River Storage Project Act contains a similar provision. Section 108 Section 108 is the type of provision which has been used for some 50 years'to indicate that actS such as the instant one are not intended to ope'r!1te as implied repeals of the portion of the reclamation laws not speCIfically affected. :',>" .' .; , ;". . ".' '. .:~