But Roger couldn't make a decision now. He turned around and went back. He was very confused now.

But he knew it was useless to be impatient. He wanted to measure it three times before cutting off the scissors. The plan was still in the preparation stage and he still had time. He had to think about it carefully.

When Roger returned to the house, he found Angelica waiting for him.

Angelica's eyes were full of worry.

"I'm fine."

"Um."

"It's really okay. You can go to sleep."

"oh."

"Go, go to sleep, I will take care of myself."

So the well-behaved Angelica turned and left, hesitating in her steps.

"Angelica,"

Angelica immediately turned around to face Roger.

"Thanks."

Then Angelica smiled, and her two little tiger teeth shone brightly in the candlelight.

Roger's mood improved a lot.

The next day Roger asked the Baron to take him to the mouth of the basin canyon to have another look. He said that another field trip was needed.

Roger wondered whether my original estimate was really unrealistic and whether it was mixed with the efficiency of modern people.

He is a little unconfident now. After all, modern people are accustomed to using high-tech tools and machinery, and "habituation" is like breathing, which is often not noticed by oneself.

Roger was very worried about whether there was a "habit" that sneaked into his original estimate. If so, then people in this era might not be able to do something that he thought was easy.

The baron's horse was running hard with two people on its back, followed by an oil bottle. The oil bottle didn't realize it, and would run in front of the horse from time to time.

The Baron sighed, and Roger apologized consciously: "Sorry, I will take good care of it."

The baron shook his head and said: "I have given up hope on it. Anyway, you and my war horse get along well. I will use it to teach you how to ride a horse another day."

The baron glanced at the "gift" again, then tsked and complained: "I have always learned riding skills from riding a pony, how can anyone be like you."

When Roger arrived at the mouth of the canyon, he was surprised to find that someone was donating blood here.

He was an Arab with camel-like double eyelids and long eyelashes. Although he was wearing an ordinary burqa, no one could mistake him for it.

Roger saw him gesturing with his hands as if to estimate the distance, and swatting the mosquitoes on his body from time to time. He curiously stepped forward to say hello: "Hello, what are you doing?"

The Arab touched his chest and saluted the Baron and Roger, then swatted a mosquito to death. He said in Latin: "Dear gentlemen, this is not a good place to talk. Why don't we go for a walk in the mountains?"

The Arab pointed to the ridge where Roger had stopped, and the three of them climbed up the mountain together.

On the way, the Arab reminded: "Your pony should be old enough to be ridden."

The Arab got two awkward smiles. Roger saw that he was confused and didn't explain.

The Arab was somewhat familiar with him. He said his name was Amir and that he was from Syracuse.

He added: "My friend Smith left me a message, and he drew a map on my bedside, marking out this terrible basin and the mouth of the canyon.

You know, he painted a whole wall on my wall. The point is, his painting skills are worse than this basin.

Is he worried that I can't see? I think he just doesn't want me to sleep."

The baron happily patted the other party's shoulder: "Are you the blacksmith's friend? I heard Smith talking about you. I am his brother, Rollo. I am glad you can come."

"Aha, I was thinking just now that you must have something to do with Smith. Otherwise, no normal person would come here."

Roger touched his nose and felt that he did not look like a normal person.

Amir spoke again: "I guess this is the Attendant Roger."

"Hey, did the blacksmith mention me too?"

"Yes, he mentioned you in his message. But the message he left was simply a riddle. I was thinking about it all the way, but I just couldn't figure it out.

The message he left was this: "Come to build a dam in Baron Rollo's territory. It will be in a bad basin. The location is shown on the map. Ask your attendant Roger for the specific situation. He has the final say. You don't need to go to the baron specifically. He can't make the decision."

.'

It just so happens that you two are here, please tell me what this means, how can the baron not be the master and let the servants be the master?"

The Baron looked at the sky in embarrassment, and Roger looked at the ground in embarrassment.

The Baron coughed and said, "Well, Roger, what did you say you were here for?"

"Ah, yes, I want to estimate the construction of a dam. Amir, you just looked at it, do you think a dam can be built here?"

"A little difficult."

Roger's heart sank.

"I just walked up the river bed for a while and almost broke my horse's hoof. The river bed here has a big drop, and the water flow will be very fast in the rainy season."

Roger's heart sank to the bottom.

"So building a dam is not possible. Weirs must be built in sections along the river bed. Weirs must be built at regular intervals in front to offset the impact of the drop, slow down the water flow, and finally build a dam here."

Roger's confidence returned a little. Things were more complicated than he thought, but they were not impossible.

"And I propose to build a dam at the mouth of these two canyons, at the foot of this mountain,"

Amir stamped his feet and signaled.

"Dig a canal to connect the two dams so that the water in the two dams can be balanced. Then open a water gate on the canal. Open it to release water in the rainy season and close it to store water in the dry season. Of course, you have to dig a trench outside the water gate directly to the Alcantara River.

.”

Roger saw hope. This plan was similar to his original one, but he was still a little worried: "Is this really feasible?"

"It should be feasible." Amir stared at the east.

He said with a look of reminiscence: "I have been to Yemen, specially. I went to Aden first.

I heard that in the past, flash floods often occurred in the mountainous areas on both sides of the mountain, flooding farmland and swallowing up villages, just like here.

In order to reduce the harm caused by flash floods and make full use of rainwater to irrigate farmland, the Aden people built the Aden Great Dam about 500 years ago in the Shamsan Valley of Crete City, which has a sloping bottom and cliffs on both sides."

He continued: "They used 53 storage tanks of varying sizes to form a dam, from top to bottom, each one larger than the last.

There are certain intervals between the storage tanks, and they are connected by water canals. After the upper water storage tank is filled with water, the remaining water is poured into the lower water storage tank through the water canals.

They have used it for 500 years since it was built, and it will probably not be a problem to use it for another 500 years. My idea just now was based on their approach."

Roger admired the wisdom of the ancients. He estimated that these Aden people spent a lot of time, after all, there were 53 reservoirs.

In comparison, it's much simpler here, and with a 20% discount based on the time they spent, it might still be acceptable.

A flame called hope ignited in Roger's heart, and he was resolutely prepared to accept the test of the storm.

He asked: "Then how long did it take them to complete the repair?"

"About 50 years."
Chapter completed!