25 U.S. Code § 384 - Employment of superintendents of irrigation
The Commissioner of Indian Affairs, under the direction of the Secretary of the Interior, may employ superintendents of irrigation who shall be skilled irrigation engineers, not to exceed seven in number.
For transfer of functions of other officers, employees, and agencies of Department of the Interior, with certain exceptions, to Secretary of the Interior, with power to delegate, see Reorg. Plan No. 3 of 1950, §§ 1, 2, eff. May 24, 1950, 15 F.R. 3174,64 Stat. 1262, set out in the Appendix to Title 5, Government Organization and Employees.