The owner of a Lot using the facilities in the private drainage easement shown on the plat of Woodbrook 4 - Division No. 1 shall have the obligation to maintain and bear the cost of maintenance of that portion of the facilities in the easement which the Lot owner uses equally with the owners of other Lots using that same portion of the facilities in the easement. Connection of drainage system on a-Lot to facilities in the easement shall commence use. The facilities in the easement are "used" by an owner of Lot from the point of connection of the facilities in the easement to a drainage system on the owner's Lot downstream to the end of the facilities in the easement. This Article shall not be amended without the consent of all lot owners using the private drainage easement.