“And be it further enacted, that the said company of proprietors shall be and they are hereby authorized and empowered,” &c. “to alter, widen, and enlarge the said canal, collateral cut, and cut of junction, and the works thereto belonging, and to raise the banks or sink the bed thereof, in such a way or manner as the said company of proprietors or the governor and council shall think fit, for making the same ten feet depth of water in every part thereof, navigable and passable for boats, barges, and other vessels.”