The district shall biennially prepare a written report on the district’s activities in the protection and augmentation of the water supplies of the district. The report shall include, among other information the board may order, a financial analysis of the district’s water utility system; information as to the present and future water requirements of the district, the water supply available to the district, and future capital improvement and maintenance and operating requirements; a method of financing those requirements; a recommendation as to whether or not a groundwater charge should be levied in any zone or zones of the district during the ensuing water year and, if any groundwater charge is recommended, a proposal of a rate per acre-foot for all water other than agricultural water for the zone or zones.