Chronicles of The Hardships of Komachi in The Sengoku Era

Nobunaga with Ozhang and Mino in his hand, but a problem surfaced which was that he ruled a vast area of land.

It is a flood. Kiso Mitsugawa (Kiso River, Nagara River and Tefi River) has long been badly damaged by floods and has been damaged from time to time by major floods.

Water damage has plagued Tokugawa since ancient times, as the embankment was erected on the left bank of the Kiso River by order of the Tokugawa family.

If he was Nobunaga in the past, he wouldn't even care about water damage, but now he thought control of waterways was important.

If you just monopolize water resources with power, you get a huge backlash.

Difficult for people to argue with, and then the most seemingly righteous, to hold the real power of water rights behind it.

Water is the most important lifeline, and if we hold the water, we will keep the people alive.

Nobunaga concludes that the best measure is to prevent further water damage and to build a embankment that can monopolize real rights while being appreciated by the people.

However, building embankments (in this case, reservoirs) and embankments will require enormous funds and time. Materials were also problematic.

Is there any way to solve it in one shot? Nobunaga takes a few days to think about it, but I can't think of a tasty handset.

When he was about to give up, narrowing it down to only important points, the flash of what should be called God's revelation came to his mind.

"Well... then we'll solve the materials, the time, the money"

The answer he came up with was to use concrete.

Precisely a way to use concrete in a frame and build a levee with soil and pebbles on top of it.

First make some reservoirs in the upstream basin.

By creating reservoirs, stable water can be supplied at all times, regardless of the rainy and dry seasons.

Once that is done, the shore protection works will be carried out next. All embankments need strength that can withstand the maximum flow rate of a river.

Here Nobunaga made plans to use concrete for the embankment.

First make a rectangular concrete block near installing the embankment. When I say block, it weighs nearly a hundred kilos and is close to a chunk of rock.

This will clarify the foundation and work area of the embankment. Later, we build up blocks, and if the river water can build up to an unworn height, we pour concrete directly into it to form a shape.

Build concrete walls to the required heights and plant greening concrete on them, mixed soil mixed with perlite, and finally trees for weeds and landscapes.

If it is concrete, it is cheaper than using rocks to create river embankments. If covered with greening concrete, an embankment can be built so that it can blend into the surrounding landscape.

People can use their own soldiers, and they can send a unit of Shizuko, educated as an engineer, as a head commander.

Nobunaga also incorporated large-scale development of the alluvial plain formed by Kiso Mitsugawa, or Noobiya, in the river embankment plan.

We will develop efficient land and transform it into one of the leading production zones in Ozhang and Mino. Materials are transported using the waterway of Kiso Mitsugawa, and a station carriage is set up to transport them to the required points with regard to land routes.

If the development of reservoirs, embankments and the Noodle Plains is completed in the upper basin, the rest will only be in the lower basin.

The lower basin of Kiso Mitsugawa was precisely the history of the fight against flooding.

In the lower basin, the Nagara, Kiso, and Tefi rivers flow meshly, and change shape every time there is a flood.

Although the embankment extends to about fifty kilometres on the left bank of the Kiso River, Nobunaga considered the complete diversion of the Kiso Mitsu River, with the main military objectives of monopolizing interests on the shipping route, defending against flooding and preventing the invasion of Western forces.

The finished diagram depicted in Nobunaga's plan was oddly in the same shape as the downstream of the modern Kiso Mitsugawa.

It is unclear whether that is Nobunaga's intention or whether he imitated the map obtained from Shizuko, but whatever his plan is, the construction ends with the completion of river renovation work in the lower basin of Kiso Mitsukawa.

Though it is the largest water cure in the Warring States period that seems to take a hundred years to complete, many supported Nobunaga's policy because water cure was a grief for those living in the land and also because the settlements and cities where Ozhang was predominant were concentrated on the west.

But they are unaware of Nobunaga's true purpose.

His real aim was to gain maritime control of Ise Bay, to bring Ise Nagashima and other inner-circle zones under his control, and to drive out the forces of Hondo Temple.