The City Clerk shall periodically report to the governing body as to the amount of money available for investment and the period of time such amounts will be available for investment, and shall submit such recommendations as deemed necessary for the efficient and safe management of city finances. The recommendations of the City Clerk shall provide for an investment program which shall so limit the amounts invested and shall schedule the maturities of investments so that the city will, at all times, have sufficient monies available on demand deposit to assure prompt payment of all city obligations.