The plans and construction of the juvenile correctional institution established by this chapter shall provide for adequate separation of the residential housing of the male juvenile from the female juvenile. In all other respects, the juvenile correctional programs for both boys and girls may be combined or separated as the secretary of children, youth, and families deems most reasonable and effective to accomplish the reformation, training and rehabilitation of the juvenile offender, realizing all possible economies from the lack of necessity for duplication of facilities.