Cal. Wat. Code § 8158
From and after the date of transfer no tax shall be levied upon the lands within any such drainage district for the payment of the subsequently maturing principal and interest upon bonds of such district, except such levy as may be made by the flood control district. However, the lands within such drainage district or districts shall be and remain liable for the payment of all of the following:
The proceeds of the collection of such drainage district taxes and assessments shall be applied solely and exclusively to the payment of the principal and interest for which they were levied, and the surplus, if any, of the proceeds of such collections shall be deposited in the county treasury to the credit of the interest and sinking fund of the flood control district and used solely and exclusively for the payment of principal and interest of the bonds of the flood control district.
Ca. Water Code § 8158