(2) Such bonds may be issued from time to time, shall be of such denominations, and shall run for a period not exceeding 40 years, all as the board of directors may determine.

(3) Every issue of bonds shall be in serial form, with definite maturities, and shall mature in annual or semiannual installments. The first installment of principal shall fall due and be payable not later than five years, and the last installment not later than 40 years, after the date of issue. The combined installments of principal and interest due each year during such period shall be in such amounts as the board of directors may determine so as to permit maturity in accordance with anticipated revenues.

(4) All such bonds, at the discretion of the board of directors, shall contain provisions for call and redemption by the district of all or any part of the issue, at the option of the district, on any interest-paying date after the date of issuance, upon payment of the principal and accrued interest to the date of call.

(5) The bonds shall be signed on behalf of the district by its president or chairperson and be countersigned by its secretary. The seal of the district shall be affixed to each bond, but not to the coupon. The coupon, in lieu of being signed, may have printed thereon the facsimile signature of such officers.

(6) The bonds shall be payable at a place therein named, to their bearer or registered holder in the principal amount named therein, at maturity thereof, in lawful money of the United States, at the rate per annum therein named, payable semiannually on such dates as the board of directors may determine, in accordance with the tenor and terms of interest coupons thereto attached. [Amended by 1957 c.334 §3; 1969 c.76 §1; 1971 c.392 §1; 1981 c.94 §13]