In the event of an emergency, the county manager may appoint or authorize appointment
of any person in order to prevent stoppage of public business, or loss of serious
inconvenience to the public. Any such person shall be employed only during the period
of such emergency. A vacancy of which an appointing authority has had reasonable notice,
or an employment condition of which he had or might with due diligence have had previous
knowledge, shall not be considered an emergency under this section.