The water that was used as a drink at the fountain, for washing clothes at the washhouse was stored in this very large basin, which originally came to touch the back wall of the washhouse. This water was then used to drive the millstones and irrigate the gardens and then the meadows. On the wall of the Pesquier, one can read "1798" in an upside down spade. This is the year, which is also famous, when the basin and the adjacent mill were raised.