The director of finance shall have charge of the administration of the financial affairs of the city, and to that end he or she shall have authority and shall be required to:

(1) Compile the current expense estimates for the budget for the city manager;

(2) Compile the capital estimates for the budget for the city manager;

(3) Supervise and be responsible for the disbursement of all monies and have control over all expenditures to insure that budget appropriations are not exceeded;

(4) Maintain a general accounting system for the city government and each of its offices, departments, and agencies; keep books for and exercise financial budgetary control over each office, department, and agency; keep separate accounts for the items of appropriation contained in the city budget, each of which accounts shall show the amount of the appropriation, the amounts paid therefrom, the unpaid obligations against it and the unencumbered balance; require reports of receipts and disbursements from each receiving and spending agency of the city government to be made daily or at such intervals as he or she may deem expedient;

(5) Submit to the council through the city manager a monthly statement of all receipts and disbursements in sufficient detail to show the exact financial condition of the city;

(6) Prepare for the city manager, as of the end of each fiscal year, a complete financial statement and report;

(7) Supervise and make all special assessments for the city government, and give such notice of special assessments as may be required by law;

(8) Collect all special assessments, license fees, and other revenues of the city for whose collection the city is responsible and receive all money receivable by the city from the county, state, or federal government, or from any court, or from any office, department, board, or agency of the city;

(9) Have custody of all public funds belonging to or under the control of the city, or any office, department, board, or agency of the city government, and deposit all funds coming into his or her hands in such depositories as may be designated by resolution of the council, or, if no such resolution be adopted, by the city manager, subject to the requirements of law as to surety and the payment of interest on deposits, but all such interest shall be the property of the city and shall be accounted for and credited to the proper account;

(10) Have custody of all investments and invested funds of the city government, or in possession of such government in a fiduciary capacity and have the safekeeping of all bonds and notes of the city and the receipt and delivery of city bonds and notes for transfer, registration, or exchange;

(11) Approve all proposed expenditures; unless he or she shall certify that there is an unencumbered balance of appropriation and available funds, no expenditure shall be approved.