Qian Xing looked at the back of Angelica leaving, and there was an evil light in his eyes.

But in an instant, he restrained the light, and sighed gloomily in his heart, how could he be worthy of the woman that the emperor fancied?

After coming out, Angelica handed the documents to Li Ping and instructed in a low voice: "The things you need have been listed for you last time, you go to the treasury to get the silver, and go to the street to buy it." ”

Li Ping stretched out his hand to take the paperwork and nodded in agreement.

Angelica looked at Li Ping a little stupidly, and thought, he is such an honest man, go out to buy things, don't be deceived.

She thought for a moment, "I'll tell you the approximate price of each in a while, it's okay to fluctuate a little bit in this price, if the price difference is too big, you can come back and ask me." ”

Li Ping hurriedly nodded and agreed: "Yes, county lord." ”

The two returned to Sinong Society, and Angelica wrote the price to Li Ping.

After that, Angelica and Sun Ji went to Chang'an City to investigate the terrain.

After two days of investigation, Angelica found that there are actually many artificial lakes in Chang'an City, such as the Imperial Lake in the Imperial Palace, the East Lake in the Prince's East Palace, and the Lotus Lake in the Lotus Garden, which are the three relatively large artificial lakes in Chang'an City.

There are many nobles in Chang'an, and many big families will dig artificial lakes in their homes.

However, these artificial lakes have not been of any use in times of drought.

In addition to the artificial lake, Chang'an City actually has a natural lake, which is called Dongping Lake in the east of Chang'an City.

Dongping Lake is large and is connected to the Qingjiang River through the Changning River.

Because the entire level of Chang'an is higher than that of the Qingjiang River, as long as there is water in Dongping Lake, it will flow into the Qingjiang River.

Usually, when the water source is sufficient, Dongping Lake will not dry up, once it is drought, Dongping Lake water source is insufficient, and it flows into the Qingjiang River continuously, so it will be dry to the bottom for a long time.

Even, even the Changning River will dry up.

Angelica stood on the edge of Dongping Lake, looked at the glacial lake of Yima Pingchuan, and asked: "If Dongping Lake is blocked, can there be enough water to irrigate the crops in the field when there is a drought?" ”

Sun Ji shook his head: "A few years ago, a minister proposed to block the exit of Dongping Lake, and the emperor did accept it, but that year, the water of Dongping Lake still disappeared at a very fast speed, and for so many years, no one had a way to solve this problem." ”。

Angelica stared at the frozen surface of Dongping Lake: "It seems that there is a floor drain at the bottom of the lake, which keeps flowing downstream, so even if the outlet is blocked, there is no way to prevent the lake from disappearing." ”

Sun Ji nodded: "Some people thought so before, one year, Dongping Lake was dry, and everyone went down to the lake to fill the leak, but there was no floor drain at all. ”

Angelica's eyes sank slightly, a lake can't hold water, except for evaporation in the sky, it is a floor drain.

In fact, sometimes the floor drain is not an obvious hole, but a sieve, a sponge-like structure, if there is enough water, then the water will not leak down, but once the water is insufficient, it will absorb water hard.

Of course, this is just speculation, so Angelica did not put the idea out there.

Angelica turned his head to look at the mountains behind Dongping Lake and asked, "Is there a cave on that mountain?" ”