N.M. Stat. § 73-16-47
[Other assessments unaffected.]
The provisions of this act [73-16-41 to 73-16-49 NMSA 1978] shall not invalidate the
levy of any assessments or the apportionment of any benefits heretofore made in
conservancy districts, nor shall the power to levy additional assessments in the manner
provided in the Conservancy Act [of New Mexico] be affected hereby.