The Modern System To Prevent Floods - Metropolitan Area Outer Discharge Channel is a massive storm water management solution for the metropolitan area of the city of Saitama, Japan. It has been designed to alleviate the rainfall that has caused six major floods to occur in the region since 1979, two from typhoons, providing an underground response to an above ground occurrence. According to experts, this sewer water discharge channel is set to minimize the flood effect by 80%.