The principal proceeds of such bonds shall be paid into a special fund in a bank or banks qualified as depositories for the municipality or for the urban renewal agency or redevelopment authority to which the municipality has delegated its power and authority with respect to such parking facilities. The accrued interest and premium, if any, shall be paid into the fund established for the payment of the principal of and interest on such bonds. The principal proceeds shall be used solely for the purposes for which such bonds were issued, except as hereinafter provided, and shall be disbursed upon order of the board of commissioners of the urban renewal agency or redevelopment authority having jurisdiction of said parking facilities, or upon order of the governing authorities of such municipality, as the case may be. If the proceeds of such bonds, by error of calculation or otherwise, shall be less than the cost of the project for which such bonds were issued and the redeeming of any outstanding bonds, then and in such event, unless otherwise provided in the resolution authorizing the issuance of such bonds, additional bonds may in like manner, be issued to provide the amount of such deficit. Unless otherwise provided in the resolution authorizing the issuance of bonds, such additional bonds shall be deemed to be of the same issue as the original bonds and shall be entitled to payment from the same funds without preference or priority to the bonds first issued for the same purpose. If the proceeds of the bonds of any issue shall exceed the amount required for the project for which the bonds were issued, such surplus shall be paid into the fund established for the payment of the principal of and interest on such bonds.