The arrival of the drying societies in the 17th century is a turning point in the management of the French swamps, now in the hands of financial speculators encouraged and supported by the royal power. These dryers, originating in northern Europe, will import their know-how in the field of reclamation in Provence, especially in the territory of Arles. The technical approach shows that the drainage of water by gravity flow chosen here contrasts with the grid techniques used at the same time for other marshes in France (Poitou, Bordeaux, etc.).