Whenever the board deems it necessary to incur a bonded indebtedness for the acquisition, construction, completion, or repair of any or all improvements, works or property mentioned in this division, and to provide for such bonded indebtedness payable exclusively from the revenues of an enterprise acquired, constructed, improved or financed for the benefit of an area less than all of the district, the board shall, by resolution, declare its intention to form a revenue improvement district and to incur such indebtedness.