§ 81. Deposit of refuse in navigable waters. It shall be unlawful to throw from or otherwise deposit, either from or out of any float or from the shore, wharf, manufacturing establishment or mill of any kind, refuse or other matter of any description, into any of the waters of the canal system or into any waters dredged at public expense and used for canal purposes. Every person that shall violate the provisions of this section shall be subject to damages to the amount as will compensate the corporation for the expenses involved in restoring such waters to its useful condition to meet the needs of canal navigation. It shall also be unlawful for any person to obstruct the navigation of a canal by the improper mooring, management or conduct of a float, or by placing any obstruction on the banks thereof.