Negative impact of artificial dams on rivers

Occasionally, hikers and families may build a temporary dam just for fun. By creating artificial dams, they slow down the natural flow of the river and cause harmful effects:
- The movement of aquatic species is essential to enable them to feed and reproduce.
- The temperature of the water rises, silt and algae thrive and it becomes more difficult for fish to breathe.
- Stones are refuges and habitats for many of the micro-organisms that feed fish. Moving or turning stones upside down endangers the aquatic environment. To protect the river, we must let it flow freely.