"'It was made the duty of the commissioners to examine the lands proposed to be drained, and those over or upon which the work was proposed to be constructed, and determine: '(1) Whether the starting point, route, and terminus of the proposed drain or drains, ditch or ditches, and if a levee or other work is proposed, the proposed location thereof, is or are in all respects proper or most feasible," . . . . . .