(2) Bonds and obligations shall not be sold for less than 90 percent of their face value, and may be issued all at the same time or in such amounts as the board deems necessary. Before issuing any bonds or obligations the board shall first pass a resolution authorizing the same and provide the whole amount thereof and the purpose of same and if payable from a separate fund shall designate the same. The resolution shall prescribe the form and substance of the bonds or obligations and provide with respect thereto the matters and things otherwise prescribed therefor in ORS 554.005 to 554.340.

(3) When any bond, obligation or coupon is payable from revenue by assessment to constitute a fund for the payment thereof, any such bond, obligation or coupon may at or after its maturity be surrendered to the corporation in payment of such assessment, but not in payment of any assessment for operation and maintenance expense or any other fund separately pledged for payment of other obligations, bonds or debts of the corporation. Bonds and obligations received in payment of any obligation shall be numbered consecutively and the lowest numbers paid off first.

(4) No obligations of the corporation shall be issued by the board unless it is determined that the annual assessment which will be required for the payment thereof as same matures together with other assessments which will be necessary for maintenance and operation expense and other purposes will not exceed in the whole the maximum amount of annual benefits which may be assessed and apportioned in any one year. Nor shall debts be incurred and obligations issued the aggregate amount of which will exceed the limitation determined by the determined benefits as stated in the recorded landowners’ notice.