Every channel, flood-gate, box, value, stop-bank, or other work constructed or maintained by the Board shall be deemed to be the property of the Board; and any person doing any act whereby any such channel, floodgate, box, valve, stop-bank, or other work may be damaged or its efficiency impaired, or doing any work or thing which prevents, obstructs, or impedes the Board in carrying out or doing any of the works hereby authorized, commits an offence and is liable to a fine not exceeding two hundred dollars.