The acquisition, construction, reconstruction, improvement, betterment, or extension of any undertaking and the issuance, in anticipation of the collection of the revenues of such undertaking, of bonds to provide funds to pay the cost thereof, may be authorized under this article by resolution or resolutions of the governing body, which may be adopted at a regular or special meeting by a majority of the members of the governing body. Unless otherwise provided therein, such resolution or resolutions shall take effect immediately and need not be laid over or published or posted. The governing body, in determining such cost, may include all costs and estimated costs of the issuance of the bonds; all engineering, inspection, fiscal, and legal expenses; interest estimated to accrue during the construction period and for six months thereafter on money borrowed or which it is estimated will be borrowed pursuant to this article; and moneys not in excess of an amount equal to 15 percent of the total principal amount of each such bond issue, to establish a debt service reserve with respect to principal and interest requirements on the bonds.