Sedimentaion tanks are an important equipments needed in subway and tunnel constructions. Tunnel Boring Machine (TBM), known as “giant mole”, digs soil or rock layers in circular movements. These machines, which are capable of drilling all kinds of materials such as hard rocks and sand, can be extracted from large masses of soil or mud with a diameter of 1 meter to 20 meters. The sludge extracted by TBM machines from subway or tunnel excavations is collected in sedimentation tanks. These tanks separate the water in the sludge. Thus, the clean water collected in a part of the tank can be used again in excavation works. This saves water transport costs to the area. In addition, waste is prevented by participating in water recycling.