When the water that five tanks are full, the water will be pumped to water collect
station then drain to Edo river.
Main point of drainage system it also bring 737 airplane engine come to modified.
There are 4 water pumps, each that can pump 200m3 per second.Moreover water gates
and water pumps are controlled here.If , in case of water exceed limit level, there is ring as
sign for preparation even they are at home.