All persons and corporations shall be liable for damage done to works of the district by themselves, their agents, their employees, or by their livestock. All persons guilty of willful damage shall be guilty of a misdemeanor, and shall on conviction be fined not to exceed Five Hundred Dollars ($500.00), and costs, and shall be liable for all damages and costs. The board of directors shall have authority to repair such damage at the expense of the person or corporation committing it.