Traditional houses in the Alps are often built into the slope. This can be explained by the desire to preserve the most easily cultivated land. The location of dwellings must also consider the proximity of water, while ensuring sufficient distance from mountain hazards (flooding, avalanches, landslides, etc.). These houses are generally arranged on three levels. The ground floor houses the stable for the herd and the farmyard. The heat given off by the animals benefits the whole house as it rises. This floor is sometimes also used to store farm tools. The first floor, accessed by a wooden staircase or balcony, is used for living space. Finally, the second floor is occupied by the barn, which is used to store grain and fodder for a whole year..