(a) A governing body of a municipality in a subregion may make appointments to the subregional board in the same ratio as the population of the appointing municipality bears to the population of the subregion.
(b) A municipality the population of which entitles it to make a fraction of an appointment may combine that fraction with one or more other municipalities in the subregion to be entitled to make one appointment.
(c) Municipalities combining population under Subsection (b) must agree on the method of making the appointment.
(d) A municipality may not combine its population with another municipality for the purpose of minimizing the representation on the board of a racial or ethnic minority.
(e) A combination under Subsection (b) of two or more municipalities having insufficient population to receive an allocation of one membership must be made before the 61st day after the date for establishing or restructuring a board under Section 452.577.