Occurrence of Attributes in Original Text

The text related to the cultural heritage 'Canal du Midi' has mentioned 'Bed' in the following places:
Occurrence Sentence Text Source
The width on the surface is 20 m on average with variations between 16 m and 20 m. Finally, the width of the canal bed is 10 m.[5]
It is necessary to re-dig the canal bed every year for two months.