The board of county commissioners may pay a part or the whole of the cost of construction, maintenance, repairing, or operating any improvements provided for in this chapter, including the payment of the county sanitary engineer and his assistants and other necessary expenses. Such expenses, insofar as they relate to the construction of any permanent improvement, may be considered as a part of the cost of such improvement, and bonds may be issued therefor. Bonds and notes in anticipation thereof, including bonds issued in anticipation of the collection of assessments deferred pursuant to sections 6103.051 and 6103.16 of the Revised Code, may be issued by the board pursuant to Chapter 133 of the Revised Code, to finance any such improvement; provided that where a separate issue of bonds is issued in anticipation of the collection of deferred assessments, the first principal maturity of such bonds may be not later than five years from the date of such bonds. Bonds issued in anticipation of the collection of assessments deferred pursuant to sections 6103.051 and 6103.16 of the Revised Code and notes issued in anticipation of such bonds shall be considered for all purposes under this chapter and Chapter 133 of the Revised Code as being bonds or notes issued in anticipation of the levy or collection of special assessments.