Sections 16880 to 16884, inclusive, shall be liberally construed to the end that water works and systems may be planned by public utility districts for areas requiring them which may not all be in one district and to the end that they may be used to the fullest capacity. Any contract or agreement made under these sections is not subject to the limitations provided in Section 16474, and such a contract or agreement made with the Federal Government, or any branch thereof, is not subject to the limitations provided in Section 16573.