Wyo. Stat. § 41-7-405
If any assessment for construction, operation, maintenance or repair that the commissioners shall have reported to the court is a smaller sum than is needed to carry out the purpose for which said assessment has been made, or if in any year an additional sum is necessary to pay the principal or interest on lawful indebtedness of the said irrigation district, further or additional assessments on the lands and persons benefited shall be made by the commissioners of said irrigation district under the order of the court, or presiding judge thereof, upon such notice as the court may direct, which further or additional assessment may be made payable in installments as specified herein, and shall be treated and collected in the same manner as the original assessments confirmed by the court in said irrigation district.
W.S. 41-7-405