A model of the reclamation work.
1.Removing the surface of the lake bottom soil
The lake bottom soil is soft, so building a levee directly on it would make it unstable.
For this reason, about 2 meters of the top soil was removed.
2.Sand replacement
Soil is brought from an area of good ground and poured into the area where the lake bottom soil has been removed.
3.Raise the embankment
The soil and sand that had been stored in advance is blown up by a dredger to make the embankment higher.
4.Digging the Main Drainage Channels
The two main drainage channels were built underwater before Ogata Village became completely land, and were subsequently improved.
The other drainage channels, which are spread throughout the area, were built while the water level was gradually lowered.
5.Regulating the Water Level
Water from within the reclaimed land is collected at the pumping stations.
The southern and northern pumping stations are each equipped with four pumps, with a discharge capacity of 40 tons per second.
The two pumping stations combined can discharge a maximum of 80 tons of water.
6.Desalination
Because Hachirogata faces the Sea of Japan, it was a lake mixed with seawater.
As a result, the water needed to be desalinated before it could be used for agricultural purposes.
A floodgate was constructed to prevent seawater from flowing in from the Sea of Japan, and renovation work was also carried out on the Funakoshi Waterway to prevent flooding.
7.Desalination
The tidal gate prevents seawater from flowing in.
It consists of a 171-meter fixed weir and a 219-meter movable gate.
There are gates that allow boats to pass through, as well as a fishway.
