Realization of topographic services on certain sectors of the middle Loire. The main purpose of the framework agreement is:

- topographic and bathymetric surveys,

- network detection,

- the control of topographic and bathymetric services during the execution of the reliability work of the levees.

Surveys in the study phase on the dikes of Val de Cisse-Vouvray (37 and 41) of Val de Tours (37).

Lot 2: surveys in the study phase on the dykes of Val d'Authion (37).

Lot 3: surveys in the study phase on the dykes of Val d'Authion (49).

Lot 4: external topographic control on the dikes of Val de Cisse-Vouvray (37 and 41), Val de Tours (37) and Val d'Authion (37).

Lot 5: external topographic control on the dykes of Val d'Authion (49).