The concept for our unit is the mobile public space. The unit is made of a concrete grid. The ground floor is completely open and has a temporary use for markets or sport places. Above the normal flood line are two housing floors. There the concrete grid is filled up with a light bamboo construction. The third floor has a semipublic function, because the water tank and all the sanitary services are located there and they are used by 4 or 5 families together. The temporary uses from the ground floor can move up to the roof level during the flood. The connected roofs create an emergency exit to the dry areas. We don’t built new units right next to the river, where the flood goes up to 6 meter.