Nothing contained in this chapter shall be construed to alter, amend, repeal, construe, interpret, modify, or be in conflict with the provisions of the Boulder Canyon Project Act (45 Stat. 1057) [43 U.S.C. 617 et seq.], the Boulder Canyon Project Adjustment Act (54 Stat. 774) [43 U.S.C. 618 et seq.], the Colorado River Compact, the Upper Colorado River Basin Compact, the Rio Grande Compact of 1938, or the treaty with the United Mexican States (Treaty Series 994).