42. a. Special assessments levied against land in class one shall be considered to be of general benefit to the entire district and areas outside of the district, as it relates to flood control projects, and shall be included as a charge against general revenues of the commission, or paid out of any funds of the commission which shall be available for such purpose.
b. When any assessment shall not be paid within two months after the date of confirmation thereof, interest thereon from the date of confirmation shall be imposed at the rate of six percent per annum.