An authorized representative, not a member of the common sewer district’s advisory board under section 204.310, from each political subdivision which lies partially within a sewer subdistrict formed pursuant to sections 204.565 to 204.573 and which operates or is served by a sewage collection system, together with the representatives of all other such political subdivisions and of each county having territory within the subdistrict, shall constitute an advisory board for the subdistrict. The advisory board shall organize by electing one of its members as chairman, one as vice chairman, and one as a representative to the common sewer district’s advisory board formed pursuant to section 204.310, however, if the subdistrict advisory board consists of less than three members, then one subdistrict advisory board member may serve in more than one such capacity. The board of trustees of the common sewer district shall keep the subdistrict advisory board informed, either directly or through the district advisory board, as to all phases of the planning and operations of the subdistrict, and the subdistrict advisory board shall make such recommendations to the common sewer district advisory board as the subdistrict board deems advisable with regard to the construction and operation of sewers and facilities in the subdistrict. If a county or political subdivision with the right of appointment under this section fails to appoint any subdistrict advisory board member within sixty days after receiving a written request from the common sewer district, then the board of trustees of the common sewer district may make such appointment.