(a) The commissioners court may change a plan, method, or contract relating to an improvement.
(b) The commissioners court may not make a change that substantially affects the nature or quality of an improvement unless the commissioners court, by a four-fifths vote, determines that it is impractical to proceed with the improvement as proposed and, after the vote, the commissioners court:
(1) obtains the consent of the person with whom the commissioners court has contracted for the construction of the improvements;
(2) obtains a new estimate of the cost of the improvement; and
(3) holds a new hearing, with notice as required by this subchapter.
(c) The commissioners court at any time may abandon an improvement with the consent of a person who has contracted with the commissioners court for the construction of the improvement.
(d) The commissioners court by order shall cancel an assessment made for an abandoned improvement.