If any person shall willfully obstruct or injure any ditch, drain, or watercourse, or damage or destroy any dike or other work constructed under the provisions of sections 31-301 to 31-369, he shall be liable to the drainage district for the full amount of the injury occasioned by the damage thereto, the same to be recovered by a civil action in the name of the district. In addition thereto he shall be deemed guilty of a misdemeanor, and upon conviction thereof shall be fined in any sum not exceeding the sum of one hundred dollars.