Subject to the provisions of subsection 2 of NRS 318A.400, whenever any indebtedness or other obligations have been incurred by a district, it shall be lawful for the board to levy taxes and collect revenue for the purpose of creating funds in such amount as the board may determine, which may be used to meet the obligations of the district, for maintenance and operating charges and depreciation, and provide extension of and betterments to the improvements of the district.