The lavogne and the tank have a dual function, vital to the plateau. The lavogne is a pond developed on the clay funds, impervious to water. It is often paved with stones to prevent gully erosion that cause trampling of sheep flocs came to drink it. The cistern collects rainwater and stores. It also feeds the lavogne, which, in its side receives runoff from Puech of Lavogne.Sources: PNRGC_DA