N.M. Code R. § 20.6.6.22
Impoundment evaporative capacity - wastewater and wastewater/stormwater combination. A wastewater or combination wastewater/stormwater impoundment shall be operated and maintained for the purpose of disposing of wastewater or both wastewater and stormwater by evaporation. A permittee shall manage wastewater or combination wastewater/stormwater impoundments to maintain the capacity and two feet of freeboard as required by Subsection D of 20.6.6.17 NMAC.
[20.6.6.22 NMAC - N, 01/31/2011]