233.513.  Bonds, road and bridge, authorized — procedures — special tax bills, purpose — sale of bonds, requirements. — 1.  The commissioners of such subdistricts so incorporated shall have power to issue road and bridge bonds for and on behalf of their respective subdistricts, payable out of funds derived from taxation of all property taxable therein to an amount including existing indebtedness payable out of funds so derived not exceeding five percent of the assessed valuation of such property to be ascertained by the assessment next before the last assessment for state and county purposes.  Such bonds shall be issued in denominations of one hundred dollars, or some multiple thereof, and the provisions of section 108.180 to the contrary notwithstanding, such bonds may bear interest at a rate determined by the special road subdistrict commissioners, payable semiannually, and to become due in not exceeding twenty years after the date of the bonds.  Whenever the board of commissioners of any such special road subdistrict propose to issue such bonds, they shall submit the question to the voters in the subdistrict.

  2.  The notice of election shall state the amount of bonds to be issued.

  3.  The question shall be submitted substantially in the following form:

  4.  The result of the submission of the question shall be entered upon the records of the subdistrict.  If it shall appear that four-sevenths of the voters voting on the question shall have voted in favor of the issue of the bonds, the commissioners shall order and direct the execution of the bonds for and on behalf of such subdistrict.

  5.  The board of commissioners shall not sell such bonds for less than ninety-five percent of the par value thereof, and the proceeds shall be paid over to the county treasurer, and disbursed on warrants drawn by the president or vice president of the board of commissioners and attested by the secretary.  The proceeds of the sale of such bonds shall be used for the purpose only of paying the cost of holding such election, and constructing, repairing and maintaining bridges and culverts within the subdistrict, paving and surfacing of new roads within the subdistrict, and working, repairing, maintaining and dragging public roads within the subdistrict.

  6.  Such bonds shall be payable and collectible only out of moneys derived from special tax bills and from the sale of such bonds, and interest that may accrue on funds so derived while on deposit with any county depositary, and the county treasurer shall hold in reserve, for payment of interest on such bonds, a sufficient amount of the money so derived that may come into his hands in excess of the amount then necessary to pay all bonds and interest then past due, to pay all interest that will become payable before the next installment of such special tax becomes payable, and three percent of the principal amount of the bonds not then due, and the county treasurer shall, whenever any of the bonds or interest thereon become due, apply such money as may be in his custody and applicable thereto, or that may thereafter come into his custody and be applicable thereto, to payment of such bonds and interest as may be due and unpaid.

  7.  All money derived from special tax bills shall be used in paying the bonds and the interest thereon, except that the money that may be collected on such tax bills in excess of the amount necessary to pay all bonds then past due and such bonds and interest as will become payable before another installment of such special tax becomes payable may, less an amount equal to three percent of the principal amount of the bonds not then due, be used for other purposes as herein authorized.

  8.  The county treasurer shall, as such bonds are sold, deliver them to the purchaser thereof upon being ordered to do so by the commissioners, and being paid the price therefor, and as such bonds are paid shall cancel them and deliver them to the clerk of the county commission.

  9.  All money derived from the sale of such bonds, except such portion thereof as is required to be reserved to meet interest payments, and all money collected on special tax bills, and all interest that may accrue on moneys so derived while deposited with any county depositary and not required to be used in paying such bonds or interest thereon, shall be used, and warrants drawn on the treasurer therefor, for the following purposes only: To pay the cost and expenses incurred by the special road subdistrict commissioners, as found by the county commission, in the preparation of such plans, specifications, estimate, map and profile, and such list of lands, and a reasonable attorneys fee, as found by the county commission, for such petitioners, and to pay the cost of improving such public road or part of a public road in accordance with the plans and specifications so filed with the clerk of the county commission, and such working, administrative and incidental expenses, not otherwise provided by law, as may be incurred in making such improvements, and the balance, if any, shall be used in paying the expense of maintaining such improvement.