Whenever it shall be the judgment of the governing body of any city of the second class that in addition to the sewer districts to be carved out of the territory embraced within the corporate limits thereof, as now provided by law, that it is necessary to build and construct a large intercepting sewer or sewers sufficient in size into which the lateral sewers may empty themselves, for the purpose of draining and caring for the sewage of said city, and that the charge therefor would be too great upon any portion of such territory, the governing body of said city may by ordinance declare that a main intercepting sewer or sewers is necessary as a condition precedent to the division of any such city into sewer districts, under the law as it now is, and that all of said territory of such municipality shall for the purposes of such main sewer or sewers be declared one sewer district, and the same constructed at the expense of the entire territory embraced therein, and fixing the point where said main sewer or sewers is to be commenced and outlining the same to a point where such sewer or sewers intercept some other watercourse or escape.

If any city of the second class has already carved out and designated any portion or portions of its territory into a sewer district or districts, and the property in such district or districts has already been taxed for building any large sewer used as a main intercepting sewer, into which lateral sewers are emptied, and the territory of the city at large has not been taxed for building such main sewer or sewers in said districts, and in the judgment of the governing body of any such city such main intercepting sewer or sewers should be extended so that it may be used as a main intercepting sewer into which the lateral sewers of the other portions of the city and the other districts of the city to be carved out and designated may be emptied, and that the expense of the said main sewer or sewers, including that portion already built, should be borne by the whole territory of the city, the governing body may by ordinance, as above provided, declare that a main intercepting sewer or sewers are necessary as a condition precedent to the further division of such city into sewer districts, and that for the purpose of extending and constructing such main sewer or sewers and paying for that portion already constructed, declare all the territory of the city to be one sewer district, and tax all property in the city for such purpose.

In case of any such extension or use of a main sewer as last above mentioned, the city shall pay to the parties then owning the property in the district or districts which constructed such sewer the amounts paid by such property in the construction of the same. If bonds are issued, as hereinafter provided, the city may issue, in addition to the sum necessary to make the extensions, such amount as may be necessary to make the payments for the old sewer, as hereinabove provided.