Tex. Water Code § 56.142

(a) If the engineer's report indicates that the capacity of the canals, drains, or outlets of the district are insufficient to carry the excess water that would be discharged into them by connecting drains or that the additional discharge of water will endanger the canals and drains or the lands and property adjacent to them, the board may give the applicant permission to construct connecting drains and secure the desired outlet on condition that the applicant make necessary enlargements of the canals and drains of the district at the applicant's own expense. The increased capacity of the canals of the district shall be sufficient to carry any increase of water caused by the connection without danger to canals and drains or lands adjacent to them.

(b) The engineer shall supervise and direct the enlargement of the canals and drains, and after the work is completed to his satisfaction, the engineer shall report to the board under his official certificate. The report shall show:

(1) the kind of work done;

(2) the extent of the work;

(3) the new capacity to be sufficient to carry excess water from the connecting drain;

(4) the number of days spent by the engineer supervising the work; and

(5) the amount due to the engineer for his services.

(c) On approving the engineer's report, the board shall issue an order authorizing the connections to be made with the canals and drains on payment of the amount due to the engineer as shown by the engineer's report and shall order the applicant to pay the engineer's salary.