Each member of any county port authority or county development commission created under the provisions of this chapter shall receive per diem compensation in the amount provided by Section 25-3-69 for each day engaged in attendance of meetings of the county port authority or county development commission or engaged in other duties of the county port authority or county development commission, not to exceed one hundred twenty (120) in any one (1) year, and shall receive their actual traveling expenses, to be audited and allowed by the county port authority or county development commission.