(a)
(1) The board of directors of the regional water distribution district may, at any time after the court has approved the improvement plan, make alterations in the plan and its works of improvement, provided such changes do not change the benefits of the improvement plan.
(2) Any such change in the improvement plan shall be filed with the court clerk.
(b) If alterations in the improvement plan would change the court-approved assessment of benefits and damages, the changed assessment must be submitted to the court for consideration according to the procedures established in this chapter; except that only owners of lands whose assessments are changed may object.