27. No such road, street, sewer, drain, or tunnel, shall - except in the case of emergency aforesaid - be opened or broken up except under the superintendence of the persons having the control or management thereof, or of their officer, and according to such plan as shall be approved of by such persons or their officer, or in case of any difference respecting such plan then according to such plan as shall be determined by the President of the District Court of the district; and such President of the District Court may on the application of the persons having the control or management of any such sewer or drain, or their officer, require the Water Commission to make such temporary or other works as they may think necessary for guarding against any interruption of the drainage during the execution of any works which interfere with any such sewer or drain:
Provided always, that if the persons having such control or management as aforesaid, or their officer, fail to attend at the time fixed for the opening of any such road, street, sewer, drain, or tunnel, after having had such notice of the intention of the Water Commission as aforesaid, or shall not propose any plan for breaking up or opening the same, or shall refuse or neglect to superintend the operation, the Water Commission may perform the work specified in such notice without the superintendence of such persons or their officer.