Whoever shall wilfully obstruct any canal, drain, ditch or watercourse or shall damage or destroy any drainage works constructed under the provisions of this chapter shall be guilty of a misdemeanor and, upon conviction thereof, shall be fined in a sum not exceeding five hundred dollars or be confined in the county jail for a period not exceeding six months and in addition thereto shall be liable to the district or the person or persons injured for double the cost of removing such obstruction or repairing such damage and for the full amount of injury occasioned to any lands, crops or other property by reason of such misconduct.