That in order to meet the necessary expenditures to enable the board of directors of any such district to plan works and supervise the expenditures of federal grants or other gifts or grants of funds, and to acquire necessary lands, easements, or leases, as herein provided, and to furnish the necessary and proper equipment, maintenance and materials, and funds for plans for supervision of expenditures and the proper direction and supervision of such projects, the board of directors of any such district are hereby empowered, authorized and directed to issue bonds of said district which shall be a lien upon all the taxable property of such district, without submitting any proposition to the voters, in an amount not exceeding seventy-five thousand dollars ($75,000): Provided, however, That not more than one issue of bonds shall be made for carrying out the purposes of this act.