245.230.  Board may issue bonds — how funds are to be used. — 1.  The board of supervisors may, if in their judgment it seems best, issue bonds not to exceed ninety-one percent of the total amount of the taxes levied under the provisions of section 245.180, in denomination of not less than one hundred dollars, bearing interest from date at a rate not to exceed six percent per annum, payable semiannually, to mature at annual intervals within twenty years, commencing after a period of years not later than five years, to be determined by the board of supervisors, both principal and interest payable at some convenient banking house or trust company's office to be named in said bonds, which said bonds shall be signed by the president of the board of supervisors, attested with the seal of said district and by the signature of the secretary of the said board.

  2.  All of said bonds shall be executed and delivered to the treasurer of said district, who shall sell the same in such quantities and at such dates as the board of supervisors may deem necessary to meet the payments for the works and improvements in the district.  Said bonds shall not be sold for less than ninety-five cents on the dollar, with accrued interest, shall show on their face the purpose for which they are issued, and shall be payable out of money derived from the aforesaid taxes.  A sufficient amount of the levee tax shall be appropriated by the board of supervisors for the purpose of paying the principal and interest of the said bonds and the same shall, when collected, be preserved in a separate fund for that purpose and no other.  All bonds and coupons not paid at maturity shall bear interest at the rate of six percent per annum from maturity until paid, or until sufficient funds have been deposited at the place of payment.  Any expenses incurred in paying said bonds and interest thereon and a reasonable compensation to the bank or trust company for paying same, shall be paid out of the other funds in the hands of the treasurer and collected for the purpose of meeting the expenses of administration.  It shall be the duty of said board of supervisors in making the annual tax levy, as heretofore provided, to take into account the maturing bonds and interest on all bonds, and to make ample provisions in advance for the payment thereof.  In case the proceeds of the original tax levy made under the provisions of section 245.180 are not sufficient to pay the principal and interest of all bonds issued, then the board of supervisors shall make such additional levy or levies as are necessary for this purpose, and under no circumstances shall any tax levies be made that will in any manner or to any extent impair the security of said bonds or the fund available for the payment of the principal and interest of the same.

  3.  Said treasurer shall, at the time of the receipt by him of said bonds, execute and deliver to the president of the board of supervisors of the said district, a bond with good and sufficient sureties, to be approved by the said board of supervisors conditioned that he shall account for and pay over as required by law and as ordered to do by said board of supervisors any and all money received by him on the sale of such bonds, or any of them, and that he will only sell and deliver such bonds to the purchaser or purchasers thereof under and according to the terms herein prescribed, and that he will return, duly cancelled, any and all bonds not sold to the board of supervisors, when ordered by said board so to do, which said bond shall remain in the custody of the said president of said board of supervisors, who shall produce the same for inspection or for use as evidence whenever and wherever legally requested so to do.

  4.  The said treasurer shall promptly report all sales of bonds to the board of supervisors, and the board shall, at the proper time, issue warrants for the payment of the maturing bonds so sold and the interest payments coming due on all bonds sold and a reasonable compensation to the bank or trust company, and the said treasurer shall place sufficient funds at the place of payment to pay the same.  In case proper warrants are not issued by the board of supervisors as herein provided then the treasurer shall of his own accord place said funds at the place of payment and the cancelled bonds and coupons and the receipt of the bank or trust company shall be accepted in lieu of warrants.

  5.  The successor in office of any such treasurer shall not be entitled to said bonds or the proceeds thereof until he shall have complied with all the foregoing provisions applicable to his predecessor in office; provided, if it should be deemed more expedient to the board of supervisors, as to moneys derived from the sale of bonds issued, said board may by resolution, select some suitable bank or banks or other depositary, as temporary treasurer or treasurers, to hold and disburse said moneys on the orders of the board as the work progresses, until such fund is exhausted or transferred to the treasurer by order of the said board of supervisors.

  6.  The funds derived from the sale of said bonds or any of them shall be used for the purpose of paying the cost of the levee works and improvements and such costs, expenses, fees and salaries as may be authorized by law and used for no other purpose.