Wyo. Stat. § 37-7-124
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 interest on lawful indebtedness of said power districts, further or additional assessments on the lands benefited shall be made by the commissioners of said power district under the order of the court or presiding judge thereof, upon such notice as the court or judge 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 power district.
W.S. 37-7-124