(65 ILCS 5/11-130-10) (from Ch. 24, par. 11-130-10)
    Sec. 11-130-10. Whenever a municipality owns and operates a waterworks system, whether purchased or constructed under this Division 130 or not, and desires to construct improvements thereto, it may issue revenue bonds under this Division 130 to pay for that construction. The procedure for that issuance, including the fixing of rates and the computation of the amount thereof, shall be the same as is provided in this Division 130 for the issuance of bonds for the purchase or construction of waterworks by a municipality, except that in the ordinance declaring the intention to issue the bonds and providing details in connection therewith, the corporate authorities shall find and declare, in addition to the other requirements set out in this Division 130, the value of the then existing waterworks and the value of the property proposed to be constructed. The revenue derived from the waterworks when the contemplated improvements are completed shall be divided according to those 2 values. So much of the revenue as is in proportion to the value of the improvements as distinguished from the value of the previously existing waterworks, as so determined, shall be set aside and used solely for the purpose of paying the revenue bonds issued for the improvements, together with the cost of the operation and the depreciation thereof, and that revenue shall be deemed to be income derived exclusively from the improvements.
(Source: Laws 1961, p. 576.)