The board of water management commissioners may issue bonds of the water management district from time to time for an amount equal in the aggregate to the total cost of the improvement including all preliminary organization and administration expenses not heretofore provided for, less such amounts as shall have been paid in cash to the district treasurer. In no case, however, shall the par value of the bonds issued plus such amounts as shall have been paid in cash to the district treasurer exceed 90 percent of the aggregate of benefits assessed against the land or other property. The bonds shall be numbered serially and shall bear interest not to exceed six percent per annum, payable semiannually, and shall mature at annual intervals within 40 years commencing after a period of years not later than five years to be determined by the board of water management commissioners, and said bonds shall be signed by the president of the board of water management commissioners, attested with the seal of said district and by the signature of the secretary thereof, and the interest coupons attached to said bonds may be executed with the facsimile signature of the secretary of said district. It shall, however, be unnecessary to affix the seal of the district to the interest coupons. Bonds issued under this section shall have all the qualities of negotiable paper within the meaning of the law merchant. Said bonds may be prepared at the expense of the district and executed from time to time or at one time and when delivered for value shall be held to the obligations of the district, although executed by officials other than those in office at the time of the delivery for value, provided the officials signing them were in office at the time they signed the bonds. The secretary of the board of water management commissioners shall file in the court of probate in which the water management district was organized a certified copy of the order of the board of water management commissioners authorizing and describing any bonds issued under this section, and the said order shall be recorded in the water management record of said county. This order shall set forth the amount, date, denomination, maturing and number of the bonds to be issued as well as the bond form including the place of payment. Before any of said bonds are delivered for value, the judge of the court of probate shall certify on each bond that a copy of the order authorizing same has been duly recorded in the water management record of said county. It shall be sufficient to say: "This is to certify that a copy of the order of the Board of Water Management Commissioners of _____ Water Management District of _____ County, Alabama, authorizing this bond has been duly recorded in the Water Management Record of _____ County, Alabama _____ Judge of the Court of Probate, _____ County, Alabama."