‘Good. Fortunately, it’s going well!’
The construction was progressing smoothly.
Lloyd, who was leading the whole process, clenched his fists tightly.
‘The Vertical Drain Method, specifically the Sand Drain (SD) Method, is proceeding as planned.’
Vertical Drain Method was a method used to improve soft soil that was first introduced in 1936. The technology had been advancing since the late 1940s.
In other words, it was a method that facilitated water drainage and accelerated soil consolidation by digging numerous artificial vertical holes in the soft viscous ground and inserting drainage materials.
‘Naturally, we can’t use modern techniques as is.’
They didn’t have the necessary equipment to do that. Thus, Lloyd used his own ways.
Javier’s technique, Mana Blast, was used to drill vertical holes. With this, the silver-haired knight played the role of a vibration-type sand drain construction equipment. Then, the holes were then filled with the bamboo straws and sand that had been prepared in advance.
Lloyd used his own combination of the Sand Drain and Paper Drain methods for this.
Next, he ordered Ppodong to pack the ground.
“Hey, Ppodong? Let’s pack the ground!”
“Ppo-dong!”
Grkk grkk.
Ppodong was rolling around on the ground with his body that weighed dozens of tons.
His weight entirely pressed the ground.
Just like pressing a pile of wet tissues, the pore-water was squeezed out of the soil. The water then gathered at the piles of sand on the ground.
Rumble….
The ground began to sink a little.
This place had been a wetlands for thousands of years.
Over the years, huge amounts of vegetation had sunk into the water and hadn’t properly decomposed. Thus, the fibers had accumulated and formed a thick layer capable of holding so much water. This thick and soft layer was called peat beds.
Now, however, pressure was applied to the peat beds, forcing the water to get out. Piles of dry sand were made here and there in an orderly manner to further encourage the discharge of the water.
Rumble…!
The water was drained while the peat beds were compressed. The soil became even more compact and firm as a result of being pressed by its own weight. This phenomenon was known as soil consolidation.
Lloyd then accelerated this phenomenon further with his following command.
“Hey, Hamang? Do you enjoy drinking from bamboo straws?”
“Ha-mang!”
“Then, can you drink from there?”
“Ha-ma-mang!”
Hamang, who had been waiting for Lloyd’s instruction, approached the bamboo straws that were planted all over the ground. Hamang then began to slurp the stagnant water that pooled on the sand bank using the bamboo straw.
“Heu-meung! Heu-meu-meung!”
Hamang drank all of the water inside. This caused him to swell like a giant balloon. More weight pressed the ground, hastening the soil consolidation process even further.
By that time, Lloyd and the Construction Team had begun the next phase of the construction, which was building embankments that’d surround the entire wetlands.
“Ppodong, go spit it out!
“Ppeu-deung! Ptoeey.”
Ppodong played the role of a dump truck. He carried a large amount of soil in his cheek pockets from time to time.
After the soil had been spat out, the Construction Team members moved according to Lloyd’s instructions. Then, they started shoveling busily to build a strong foundation. The structure obviously had been designed by Lloyd in advance.
‘Naturally, this process is important. If we pile up soil just as is, the embankment slope will begin to erode, resulting in the piping phenomenon1Piping phenomenon: is defined as the progressive development of internal erosion by seepage, appearing downstream as a hole discharging water. Piping is induced by regressive erosion of particles from downstream and along the upstream line towards an outside environment until a continuous pipe is formed.. Soon after, the base of the slope will collapse, causing water to leak from the embankment.’
All of these would lead to the embankment’s collapse. If this happened, water from the flooding river would enter once again, turning this whole land back into damp swamps.
Therefore, an elaborate design was essential to prevent such a shitty situation that would cause everyone’s happiness index to fall in a steep downward curve.
The slope of the embankment was made as gentle as possible. The height of the embankment was set as high as possible while also taking into account the height of the ground, which would decrease in the future due to the soil consolidation process.
As a result, there was a height difference between the front part of the slope that’d block the river water from entering and the back part of the slope that’d be on the side of the reclaimed land.
Some kind of platform made by piling up soil was slowly and steadily built on the back sides of the slope to help support the pressure.
Lloyd also didn’t forget to pack the soil on both slopes. Thanks to this, Ppodong got busy rolling on the embankment slopes.
“Ppo-do-dong! Ppo-do-do-do-dong!”
Grkk grkkk.
Ppodong’s sturdy body rolled like a bulldozer, or more accurately, a road roller.
After that, the Construction Team was deployed to plant grass in dense lines. The grass roots would firmly grip the soil on the slope. With this, the soil wouldn’t be prone to erosion in the future.
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