28 C.F.R. § 115.13
(a) The agency shall ensure that each facility it operates shall develop, document, and make its best efforts to comply on a regular basis with a staffing plan that provides for adequate levels of staffing, and, where applicable, video monitoring, to protect inmates against sexual abuse. In calculating adequate staffing levels and determining the need for video monitoring, facilities shall take into consideration:
(c) Whenever necessary, but no less frequently than once each year, for each facility the agency operates, in consultation with the PREA coordinator required by § 115.11, the agency shall assess, determine, and document whether adjustments are needed to: