The said assessment shall then be delivered to the treasurer of the association for collection, who shall proceed forthwith and shall demand payment from each person named in said assessment of the amount apportioned to him, and if any such person shall neglect or refuse to pay the amount within 5 days after such demand to the treasurer, the same may be sued for and recovered, as provided for in section 18 of this act. Or the board of directors of such water-power company, may, by resolution direct that no member of said company or occupant of such power, whose assessment has been due and unpaid for 30 days after notice in writing of such assessment, shall be permitted to draw water from the race of said water-power company until such assessment is paid, and such board of directors may, after the expiration of 30 days, after notice in writing as aforesaid, board up, or close the gate of flume of such delinquent member, or person, or owner, and keep the same closed until the assessments due as aforesaid have been paid.