This operation was submitted by the company Aigue Force Breland SARL to improve the ecological continuity on the Sioule River to the right of the hydroelectric micro-power plant of the Breland Mill. The book is listed on the list of 16 priority works of the 2014-2019 Loire Basin Migratory Fish Management Plan (PLAGEPOMI 2014-2019). This work, as it stands, delays or blocks the migration of highly migratory amphiphrine fish in the run-up and downhill phase. The work is intended to improve the long-term circulation of amphihalin migratory fish so that they can complete their life cycle and reproduce. The target species are Atlantic salmon, sea lamprey and eel. This operation is submitted under Action 12 of the ERDF Loire POI.