The Review of tsunami-bank by forest. {What length of the mound does the rubble realize?

⌒η~(∵~{Follow-up!
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At the interview of TV report, local people had stated candid advice.

It is the opinion about the fact that the scene of a hometown is converted by the concrete bank for high tsunami.

Although it is low cost, "the forest bank by rubble" changes the scene till then a lot.
And it is a memory monument of a disaster. Does the green dispel a safe-return person's field of view? Or does it close?

The Ministry of Environment of Japan says that there is 22,530,000 cubic meters of rubble of northeast prefectures.

The composition of rubble is oil materials, such as wood of a house, a piece of concrete, metal as a damaged car, vinyl, a plastic.

In the area except Fukushima, renewable resource are picked out from rubble or appeal has started rubble undertaking to other prefectures.
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What bank can be made using the remaining rubble? I recollected the work of the arithmetic learned at the elementary school.

By the inclination which is 45 degrees, And the basic depth is 10 meters. And 80 meters of basic wide. And the height from the ground is 40 meters. And the width of the peak is assumed to 20 meters.*

Then, the calculator hammered out the next answer(about). The total extension is 4000 km when the rubble which can be used is 50%.
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It is 2600 km in 30% of the case by the total extension.
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20% of case is 1600 km.

If it is this, there is quantity which guards the northeastern flat ground.

And tsunami ascended the river several kilometers. If there is local agreement, rubble is applicable also to making the bank of a dry riverbed, and padding of an accommodation space.
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