California Code, Water Code - WAT § 9485

Upon the sale of any of the bonds of the drainage district based upon any assessment levied by the board, as provided by this part, the board shall annually thereafter, by an order entered in its minutes ascertain and determine the total amount necessary to be collected upon the assessment for the payment of principal and interest of all bonds which will or may become due on the two semiannual due dates next succeeding the date of the order.