The total bonded indebtedness for the purposes described in Kan. Stat. Ann. § 68-586, whether for one or more issuances, shall not at any time in the aggregate exceed four percent (4%) of the total assessed valuation of such county, and any bonds issued under the provisions of this act shall not be subject to or within any bonded debt limitation prescribed by any other law of this state and shall not be considered or included in applying any other law limiting bonded indebtedness. All tax levies made to retire such bonds shall be in addition to and not limited by any other act authorizing or limiting the tax levies of such counties.