A sea embankment using concrete rubble left behind after the March 2011 earthquake and tsunami has been completed at the mouth of the Natsui River in Iwaki, Fukushima Prefecture.
Primary school students in Iwaki planted trees there on Oct. 31 marking the completion of the embankment.
The Fukushima prefectural government started constructing the embankment in March this year to protect the city from tsunami and high water, spending about 1.1 billion yen.
The embankment measures 7.2 meters in height, almost the same as the tsunami waves in March 2011, and 920 meters in length.
The rubble was smashed into pieces measuring from several millimeters to 6 centimeters in length. They were then mixed with cement and water to build the sea embankment under the CSG (cemented sand and gravel) construction method.
This is the first time the CSG method has been used to build a sea embankment in Japan.
Thirty-one students at Natsui Elementary School in Iwaki joined the tree-planting ceremony.
Two sixth-graders, Yuga Otomo and Azusa Watanabe, sounded a bell in memory of the disaster victims before the participants offered silent prayers.
After the participants walked on the embankment, the students planted Japanese black pine nursery trees, symbolic of the city, on the sea coast.
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