The district board shall prescribe by resolution the form of the bonds, and interest coupons. The bonds shall be payable at such times and at a place to be fixed by the board, and designated in the bonds, together with interest on all sums unpaid on that date until the whole of the indebtedness has been paid. The term of bonds issued shall not exceed 40 years.
The district board may divide the principal amount of any issue into two or more series and fix different dates for the bonds of each series. The bonds of one series may be made payable at different times from those of any other series. The term of bonds of each issue or series shall not exceed 40 years from the date of the bonds.