The bonds shall be issued in such denominations as the district board determines, except that no bonds shall be of a denomination less than one hundred dollars ($100) or greater than one thousand dollars ($1,000). They shall be payable on the day and at the place fixed in the bonds, and with interest at the rate specified in the bonds, which rate shall not be in excess of 8 percent per annum, and shall, after the first year, be payable semiannually.