Surveys across watercourses and hydraulic structures on the Douce and Allaine watersheds in order to carry out hydraulic studies.

- the Douce watershed: this involves raising 110 cross sections and 54 hydraulic structures,

- Allaine watershed: this involves raising 224 cross sections, 19 longitudinal profiles and 93 hydraulic structures.

During the services and according to the specificities of the rivers, it is possible that cross profiles and additional hydraulic structures are to be raised.

These surveys will be used for hydraulic studies.