The technical engineers in Japan had come up with an extra-ordinary storm water management solution, which is the amazing underground system that effectively deals with the flood water and prevents the area from the massive damage to lives and properties.
It is called The Metropolitan Area Outer Discharge Channel, constructed to minimize the damage caused by heavy rainfall or typhoons. Since 1979, the city had faced six major floods, two of which were from typhoons. So this particular underground system has been set up with specific responses to an above ground occurrence. According to experts, this sewer water discharge channel is set to minimize the flood effect by 80%.