The students of the Water Science and Technology speciality and the students of the Water and Civil Engineering speciality of Polytech Montpellier are organising four half-day scientific seminars on the theme of water. This year, the four themes are: 1) Trace metals in industrial wastewater, what solutions, what processes? (Monday 14 February 2022 - morning) 2) Contamination by industrial effluents: new biological tools? (Tuesday 15 February 2022 - morning) 3) Innovative materials for hydraulic structures (Wednesday 16 February 2022 - morning) 4) Making cities permeable, the concept of sponge cities (Thursday 17 February 2022 - morning)