With regard to projects constructed by a federal agency, including the soil conservation service or natural resources conservation service, the water resource board may finance in whole or in part the maintenance of the project with funds raised through the collection of a special assessment levied against the land and premises benefited by maintenance of the project. The assessments to be levied may not exceed four dollars per acre [.40 hectare] annually on agricultural lands and may not exceed two dollars annually for each five hundred dollars of taxable valuation of nonagricultural property. No action is required for the    establishment of the assessment district or the assessments except the water resource board must approve the maintenance and assessment therefor by a vote of two-thirds of the members and the board of county commissioners of the county in which the project is located must approve and levy the assessments to be made by a vote of two-thirds of its members. If a board that undertakes a project finds that the project may benefit lands in this state outside water resource district boundaries, the board shall provide notice to the water resource board where the benefited lands are located. The board of each water resource district containing lands benefited by a project must approve the project and assessment by vote of two-thirds of its members. The board of county commissioners in each county that contains lands benefited by a project must approve and levy the assessment to be made by vote of two-thirds of its members. If a project and assessment is not approved by all affected water resource boards and boards of county commissioners, the board of each water resource district and the board of county commissioners of each county shall meet to ensure that all common water management problems are jointly addressed. In addition, the water resource board that undertakes the project may proceed with the project if the board finances the cost of the project and does not assess land outside of the district. Before an assessment may be levied under this section, a public hearing must be held. The hearing must be preceded by notice as to date, time, location, and subject matter published in the official newspaper in the county or counties in which the proposed assessment is to be levied. The notice must be published at least ten days but not more than thirty days before the public hearing.