On the cloud boat, Chen Xu and Wen Daoyuan surveyed the mountains and rivers.

He said, "First, we need to establish sediment dams in areas prone to rockfalls. This step-like layout can disperse the upstream water impact."

Wen Daoyuan focused on the cloud disk, only to see the clouds and mist above it constantly changing.

In just a moment, the mountain and river formations completely altered, with semi-real, semi-imaginary sediment dams ingeniously emerging on the cloud disk as if crafted by the heavens.

For a moment, Wen Daoyuan did not know whether he should marvel at Chen Xu's methods of pointing out the mountains and rivers or be astonished by his masterful transformation technique.

His magic is wondrous, this was Wen Daoyuan's second impression of Chen Xu.

In the Great Li's Splendor Record, Chen Xu's battle achievements are documented.

Even Evil Cultivators in the Core Formation Realm have been directly slain by him; claiming he's just a frail scholar who has only just opened the Sea of Literature would surely be speaking nonsense with open eyes.

Therefore, Wen Daoyuan had long been prepared; he knew Chen Xu's cultivation was not weak.

But there is a difference between not being weak in cultivation and having wondrous magic.

Wen Daoyuan was already a Great Scholar, yet coming here, he found himself somewhat unable to see through this young man before him.

He stared at the cloud disk and questioned Chen Xu, "Since ancient times, in flood control, diversion is better than containment; with so many sediment dams in sequence, even if they can block large debris, won't they obstruct the flow of the river more?

Once the flood season arrives, if the river water accumulates too much, wouldn't it risk descending in torrents, spreading floods everywhere?"

At this point, Wen Daoyuan reached out and drew a fan shape on the cloud disk in front of him.

As he pointed again, a vast torrent of cloud mist indeed formed above.

The torrent rushed downward, ravaging the broad Cyan Forest Plain below the Lingxi Mountains, simultaneously impacting Pingyang Prefecture, forming a natural alluvial fan.

The elements are ruthless; if this truly happens, how many people in the Seven Prefectures of the South could escape the onslaught of such a torrent?

Chen Xu, however, remained unbothered as he gently nudged each sediment dam and used his finger like a pen to draw on the cloud disk.

"What if we pre-emptively leave flood discharge channels on the sediment dams?"

Chen Xu said, "The mountain terrain here is steep; open diversion channels to guide the flow. During flood season, they can direct floodwaters past the rockfall areas; during dry seasons, they can divert water directly to farmlands.

But to prevent irrigation from becoming uncontrollable, there should be water-dividing gates, branch channels, and storage lakes here. This way, during wet seasons, water is stored, and during dry seasons, irrigation is supplemented.

Additionally, planting reeds, willow trees, and other vegetation can conserve soil and retain water, forming wetlands to purify sediment..."

As he explained, under his guidance, the cloud disk constantly changed.

Moreover, he was not just speaking idly; as he explained, Chen Xu gazed at the land, measuring distances with his eyes.

He remembered every landscape feature he saw from above, his eyes—though mere mortal eyes—seemed to transform into a divine survey artifact.

Rows of precise data flowed in his eyes as he reached out to list formulas at his side.

The sky became his paper, and the clouds his ink.

Strands of formulas were born under Chen Xu's fingers, from Celestial Origin Technique, to Decline Division Technique, to the Great Evolution Seeking One Technique, Difference in Sums Technique, Pythagorean Circle Technique, among others.

Some are commonly used by today's mathematical experts, yet others, even these experts find difficult to employ proficiently.

Indeed, Wen Daoyuan himself did not walk the path of mathematics, yet how could he not know the level of the elite among today's mathematicians?

Standing on the cloud boat, Wen Daoyuan had first been calmly watching.

But as he watched, even he, a Great Scholar, found himself overwhelmed.

An indescribable sense of awe gradually arose in his heart, somewhat reminiscent of when he first read Chen Xu's "Policy Against the Locust Demon," though in truth, fundamentally different.

Wen Daoyuan almost blurted out, saying, "Wait a moment!"

He wanted to ask Chen Xu to write slower.

However, those two words, Wen Daoyuan ultimately did not utter.

He feared that if he spoke, he would disrupt Chen Xu's train of thought.

Wen Daoyuan knew well that, in this moment, the calculations Chen Xu was undertaking required an enormous mental toll.

Though Chen Xu's cultivation was deep, could he, in such a short time, sustain such concentrated and massive calculations?

Wen Daoyuan realized once more things were unfolding beyond his initial expectations.

Initially, Wen Daoyuan just wanted to meet Chen Xu to discuss in detail the "Policy Against the Locust Demon."

Later, Wen Daoyuan hoped Chen Xu could calculate part of the South-to-North water diversion route, providing a measure of convenience for his upcoming spellcasting.

As for any remaining incomplete details, though Wen Daoyuan was not proficient in mathematics, he possessed an extraordinarily exquisite technique: the "Boundless Unity of Heaven and Man."

Through this Boundless Unity, if he were willing to sacrifice his own Dao will, he might autonomously find the optimal path under the impact of Dao will.

This night, Wen Daoyuan intended to bring about the grand feat of the South-to-North water diversion.

But lacking the Emperor's support, and without a strong logistical base, he was prepared for sacrifice from the start.

The "Boundless Unity of Heaven and Man" was Wen Daoyuan's trump card.

But if sacrifice could be avoided, who would choose to face death?

Wen Daoyuan suddenly waved his hand, causing a stack of blank paper to appear suspended in the air before him.

With his right hand holding a pen and his left hand holding the papers, he hurriedly transcribed each calculation Chen Xu made.

In the skies above, that young man, clothed in azure, drew the mysteries of a vast land, mountains, and rivers with clouds and mist.

Beside him, the Great Scholar diligently recorded, as if capturing this scene for eternity, to pass down through the ages.

Rustle, rustle, rustle.

In the sky above, there suddenly was no sound of speech.

Only the urgent and rhythmic sound of Wen Daoyuan's pen scratching the paper could be heard.

Chen Xu's brain spun rapidly.

Wen Daoyuan watched his every movement, expression changing, simultaneously steering the cloud boat, constantly altering its course so Chen Xu could calculate more water route data.

Wen Daoyuan's emotions had shifted from an initial turbulence to a calm surface, with undercurrents running deep.

He did not know how much longer Chen Xu could endure; he had several methods at any time to replenish Chen Xu's physical strength and Divine Soul.

But at this moment, Wen Daoyuan dared not act rashly.

He could only watch as beads of sweat seemed to form on Chen Xu's forehead, while the cloud boat had already flown past Pingyang Prefecture, heading north towards Linchuan Prefecture and Anning Prefecture.

Until it flew out of the Seven Prefectures of the South, entering Jingheng Province, Yunshuo Province, and even the drought-stricken Longchuan Province now!

In one night, they traversed north and south.

This is the power of a Great Scholar.

And Chen Xu, within the limited hours, transformed the geographic schema into vast formulas, computed them individually, manipulated the cloud disk—was this not also a remarkable feat?

Wen Daoyuan sensed that Chen Xu's own energy pulses were in constant flux.

And at the same time, in the Jade Capital Celestial City, within the Imperial Palace.

The sleeping Emperor abruptly awoke, clutching his chest, feeling an inexplicable thrill of fear.

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