Provided always that, whenever it shall seem fit to the canal-officer for any special reason to enter upon his register as one village-channel a section of a village-channel which includes portions lying within two or more villages or mauzas, the canal-officer may, with the consent of the Collector obtained in writing, register such section as one village-channel, and such section shall be deemed to be one village-channel in respect of all rights and liabilities imposed by this Act.