The banks of rivers and streams, even in case they are of private ownership, are subject throughout their entire length and within a zone of three meters along their margins, to the easement of public use in the general interest of navigation, floatage, fishing and salvage.
Estates adjoining the banks of navigable or floatable rivers are, furthermore, subject to the easement of towpath for the exclusive service of river navigation and floatage.
If it be necessary for such purpose to occupy lands of private ownership, the proper indemnity shall first be paid. (553a)