1. The county commission may issue bonds for and on behalf of any drainage district created under this chapter, for the purpose of paying the cost of the completion of the improvement as located, described and set forth in the report of the viewers and engineer, as confirmed by the county commission and the payment of all duly authorized expenses incident thereto. The aggregate par value of such bonds shall not exceed the taxes levied to pay the cost of the improvement and the expenses incident thereto as provided in this chapter, exclusive of the ten percent for emergencies and the amount added to the tax levy to meet the interest on the bonds of the district.

2. Any bonds issued hereunder shall be in denominations of one hundred dollars and multiples thereof and shall bear interest at a rate not to exceed six percent per annum, payable semiannually, shall be payable as to principal and interest at the office of the county treasurer and shall be signed by the presiding commissioner of the county commission and attested by the signature of the county clerk and the official seal of the county commission. A substantial amount of the total bonds issued to construct the improvement shall mature each year beginning not later than five years from the date of delivery for value of the first bonds. None of said bonds shall mature more than twenty years after date of issue of same.

3. Bonds issued hereunder shall be signed and delivered to the county treasurer and shall be sold by him, with the consent and approval of the county commission, at not less than ninety-five percent of the par value plus accrued interest. Said bonds may be prepared, dated and executed at one time and when delivered for value in accordance with the terms of the contract of purchase shall be held to be the obligations of the district though executed by officials other than those in office at the time of delivery for value; provided, the officials signing them were such officials at the time the bonds were signed. Said bonds shall show upon their face the purpose for which they are issued and the principal and interest thereof shall be payable from the proceeds of the taxes levied upon the land and other property in the drainage district as provided in this chapter. At the times any bonds are issued, a sufficient amount of the said drainage taxes shall be set aside and appropriated to pay the principal and interest of said bonds and it shall be the duty of the county commission to arrange and determine the annual installments of said taxes so as to provide funds in due time for the payment at maturity of the principal and interest of any bond authorized and issued hereunder. The proceeds of any taxes so appropriated shall be used for the purpose of paying the principal and interest of said bonds and no other.

4. If necessary to promptly pay said bonds and the interest thereon the county commission shall rearrange the schedule of annual installments made at the time the taxes were levied and shall also make such additional tax levies as are necessary and shall provide for the collection of the same at such times as will produce the required amounts. Under no circumstances shall the county commission make any tax levies which will in any manner, or to any extent, impair the security of the bonds issued hereunder or the fund available for the payment of the principal and interest of the same. Bonds and coupons not paid at maturity shall bear interest at the rate of six percent per annum until paid.

5. If deemed advisable, the county commission may, by its order of record, select especial depositary or depositaries for the proceeds of any bonds issued hereunder as temporary treasurer or treasurers to hold and disburse said funds to the county treasurer as the work progresses, on the order of the county commission, provided said special depositary shall secure said funds by approved collateral or by the bond or bonds of a surety company or surety companies authorized to transact business in Missouri, the premium or premiums on which bond or bonds may be paid out of any funds belonging to the drainage district.