Any city proposing to make any improvements under the authority of the act may by ordinance establish a “special improvement fund” in the city treasury, and levy an annual tax on the assessed taxable tangible property of the city for the purposes of such fund and to pay a portion of the principal and interest on bonds issued by such city under the authority of Kan. Stat. Ann. § 12-1774, and amendments thereto. Such fund may be used to pay the cost of planning any improvement hereunder and for preparing preliminary plans, studies and engineering reports preparatory to the consideration of the feasibility of any improvement and to pay the initial cost of such improvements when ordered by the governing body and until temporary notes or improvement bonds shall have been issued and sold, except that such fund shall be reimbursed from the proceeds of such improvement bond funds. The special improvement fund shall not exceed one percent (1%) of the total assessed tangible valuation of the city for the preceding year or one hundred thousand dollars ($100,000), whichever amount is less. Such fund need not be budgeted for expenditure during any year but the amount thereof shall be stated in the published budget of expenditures. All grants in aids or contributions made to the city for planning and preparation of plans for improvements made under this act may be credited to the special improvement fund and the amount of such aid or contribution shall be in addition to the amount of such fund otherwise limited by this section.