Navigability is the condition of a body of water, which states that it shipping - cargo vessels, passenger ships and / or recreational vessels - can be operated.
In Germany, the Waterways and Shipping Administration Federal (WSV ) is responsible for the navigability of the federal waterways. You will, amongst other things, the classification of inland waterways in a scale of I to VII, see the definition of the classes. For the navigability of waterways, the country's federal states are responsible.
One reason for lack of navigability may be insufficient water depth. Navigable waters may temporarily lose by ice or other obstacles their navigability; Therefore, the thickness of a sheet of ice, the ice conditions and the ice drift will be announced in the winter.