To levy and collect special assessments upon lands under Class C as herein provided, the board shall make contracts for water service with each of the petitioning irrigation districts within the district in the manner as hereinafter provided and shall fix and determine the rate or rates per acre-foot and terms at and upon which water service shall be supplied to such irrigation district; Provided, that such rates shall be equitable although not necessarily equal or uniform for like classes of services throughout the district. In the event any irrigation district shall desire to obtain the beneficial water service from the district, the board of such irrigation district shall by resolution authorize and direct its president and secretary to petition the board for water service, upon terms prescribed by the board, which petition shall contain inter alia, the following:
Neb. Rev. Stat. §§ 46-548