Thousands of young people took to the streets last year to demand that the world change its relationship with the environment and find solutions to emergencies such as climate and water management in particular. Climate change is "a global problem", as is access to clean water, which must be protected as an "essential, fundamental and universal human right", "rooted in the 'inalienable dignity' of man. "Transforming our world". The 2030 Agenda for Sustainable Development is a document adopted by heads of state at the Sustainable Development Summit in 2015. The close link between human well-being and the health of natural resources is a common challenge for all countries. Among other goals on the agenda of this summit was the concern about the protection of the hydrosphere. In particular, the sixth goal aims to "ensure the availability and sustainable management of water and sanitation for all". Water, the source of life, is very precious and must be accessible to combat socio-economic inequalities. The lack of "access to water" is increasingly determined by environmental factors, degradation, climate, source of social conflicts. This causes the migration of flows. In 2015, out of 27.8 million migrants, 19.2 million were motivated by environmental causes. Because of the ecological complexity, and the resulting crisis, it was more than urgent to find solutions. It is also necessary to resort to the cultural wealth of peoples, to art, to inner life and spirituality. The theme of water is very present in the thought of ancient philosophers: for Thales, water is the substance at the origin of all things; its softness also explains the change in things themselves and in Heraclitus' famous "Panta Rei", becoming is opposed to being, water, matter Water as an all-encompassing force, representing everything and the opposite of everything in its flow, its change and its becoming. Water as a beginning and as an end; source of life, moral purification, spiritual regeneration, femininity, sensuality and youth, but also death when its flow turns into a storm, it becomes an omen of darkness and negativity. Water as source and mouth, river and sea; as the Mediterranean is a bridge between nations, the ocean is a bridge between continents; water as a journey of hope for migrants: people fleeing their lands often cross the seas: water can save them from a difficult life, but it can also swallow them up forever. Water as communication, sharing, trade. Poitiers is bathed by two rivers, tributaries of the Clain. Water is abundant and the inhabitants consider it as a precious commodity and use it with respect, valuing it as part of the secular heritage of the "Seuil Poitou". The Seuil Poitou was born from the partial diversion of the waters of one of the two rivers: the Clain. During the past centuries, Poitiers was crossed by a ruined aqueduct which supplied the numerous scholars' workshops with motor power. From the aqueduct, blocked by a partition, water overflowed and flowed along the main street of the historic city centre during the summer. The tradition originated in Roman times as a system of street cleaning and a method of mitigating the summer heat. The Poitou Threshold became an opportunity for communication and sharing, a fantastic moment of knowledge and approach beyond words. This project intends to graft new attitudes on the environment and on the ancestral rite of the Seuil du Poitou. The issue of water resources exploitation was addressed in a conscious and focused way, young people and local actors were sensitised to the issue of sustainable water management and climate change because social development (inclusion, justice and equality) goes hand in hand with environmental and economic development. The objectives of the project were - To raise awareness on the following issues: 1) climate change 2) global warming 3) waste of water resources