Ye Zhenzhen asked: "I have seen the city's water supply map, the Rose River in the north of the city is the city's tap water intake, and, in addition to the Rose River, there is no big river on the map, after the earthquake, the water level of the Rose River suddenly dropped sharply, and the city's water supply is tight, and it is all dependent on pumping groundwater to meet the emergency." ”

Zhu Wu explained seriously, "There is also a small river, maybe it is not marked on the map, because that river is usually a small ditch, and it only appears in the summer when it is rainy, and it runs parallel to the Rose River, and many citizens will also go there to get water." ”

Nan Zhiqiao grabbed Zhu Wu and asked, "Let's go, take us to the small ditch you said." ”

Zhu Wu was very happy to help, and after a brief talk to his family, he took Nan Zhiqiao and Ye Zhenzhen to the hidden ditch.

When they arrived at the edge of the "small ditch" that Zhu Wu said, the three of them stood in place in amazement.

What used to be a small ditch has become a wide river, and the water floods the meadows on the banks, and the muddy water rushes from west to east, and the depth of the river bottom is not clear.

Ye Zhenzhen watched the small ditch turn into a big river, and asked: "It's winter now, and it's not the rainy season, why is the water flow so big?"

Zhu Wu also wondered, "This is not right, in previous years, even when it was raining and flooding, the water potential here was not so big, what happened?"

Nan Zhiqiao looked at the rushing water in front of him, and then connected to the water level of the original main river Rose River, which suddenly dropped sharply after the earthquake, and there was only one explanation for everything, the earthquake changed the location of the river, but on the first day of the earthquake, he came to inspect the vicinity, and the water level of the Rose River dropped at that time, and this small ditch only appeared in the last two days, what does this mean?

For the first two days after the earthquake, the river was temporarily accumulated somewhere, and when it accumulated to a certain extent, it flowed down the changed course again.

Barrier lake!

By the way, this can be explained, there must be a dammed lake formed by the earthquake upstream of this river.

Nan Zhiqiao said the inference in his heart, Ye Zhenzhen and Zhu Wu were surprised at first, but what Nan Zhiqiao said was reasonable, and both of them believed that the next thing was to find the dammed lake and check the water source.

The three of them walked upstream along the meadow next to the new channel.

There is no road on the bank of the new river channel, there are some wild grass and shrubs, the three of them try to find a hard soil surface that can walk in the wild grass, the more upstream they go, the steeper the terrain, the grass gradually turns into a forest, the three of them follow the new river all the way away from the city, into the nearby mountains.

In the mountainous area, which is more than ten miles away from the city, and is also the closest place between the old and new rivers, the landslide caused by the earthquake completely blocked the original channel of the Rose River.

The three of them climbed to the top of the hill on the side of the hillside that had never collapsed, and stood on the high ground at the top of the mountain, looking down on the blocked upstream river, and all three of them were taken aback.

The blocked channel of the upper Rose River forms a long, narrow triangular lake along the collapsed hillside and the slopes on both banks, and the water collected in the lake submerges the meadows and forests on the slopes on both banks, and at the southwest gap the lake pours out, along the low-lying terrain, into a new channel.

"This is the dammed lake formed by the earthquake!" Zhu Wu couldn't help but be surprised when he saw such a large dammed lake for the first time.

"Senior Nan, the dammed lakes in the earthquake-stricken areas are generally unstable, if the collapsed slopes of the dammed rivers loosen again and the dammed lakes burst their banks, won't the downstream be flooded?"

Nan Zhiqiao's gaze moved from the surface of the dammed lake to the collapsed hillside, and then to the junction between the lake and the two banks, and said in a deep voice: "Whether the dammed lake will burst its embankment, we must notify the water conservancy department to send experts to investigate, but now we have to solve the source of this cholera epidemic." ”

"Is this dammed lake the source of the cholera epidemic?"

Ye Zhenzhen and Zhu Wu both looked at Nan Zhiqiao, Nan Zhiqiao stretched out his hand and pointed to the place where the hillside and the dammed lake under his feet meet, "Look, what are those?"

The two looked down and saw that the hillside at their feet was flooded by the dammed lake, and the trees that originally grew on the hillside only exposed the canopy of different heights, the crown was immersed in water, and the leaves began to rot a little, and there were groups of beige meat balls floating around the canopy.

Ye Zhenzhen was a little disgusted, and she was busy covering her nose, "No wonder I kept smelling a strange smell just now, it turned out to be these rotten pig carcasses." ”

Nan Zhiqiao frowned slightly, staring at the dense dead pigs on the edge of the dammed lake, and then looking at the center of the dammed lake, the small beige dots looked like dead pig corpses, and there were bird corpses with colorful and green feathers inside.

How could so many dead pigs, and all of them large white pigs, die in a dammed lake?

Zhu Wu, a high school student, suddenly clapped his hands and shouted: "I remember, I used to hear the second aunt say that there is a pig farm in the upper reaches of the Rose River, and many citizens react that the manure of the pig farm will pollute the river water, and they want to move the pig farm, but the owner of the pig farm seems to have a relationship, and he has not left the upstream mountain, and it has not been solved for a long time, these dead pigs should be in the pig farm, the earthquake came suddenly, and it is estimated that the staff in the pig farm and these pigs have not escaped, and they are all buried in the dammed lake." ”

Zhu Wu said a little sadly, but Ye Zhenzhen sorted out the original situation clearly, "The earthquake caused the collapse of the mountain in the upper reaches of the Rose River, and the debris that collapsed blocked the channel of the Rose River, and the river water and rainwater accumulated in the upstream river, forming the large dammed lake we see now, the earthquake landslide and the rise of the river level, all the pig farms that were originally in the upper reaches were submerged, and the big white pigs in the pig farms soaked in the river water gradually rotted and smelled, and these rotting corpses are likely to be the source of the spread of cholera." ”

Zhu Wu looked at Ye Zhenzhen with admiration and asked, "The source of the infectious disease has been found, so what should we do next?"

"Collect specimens to collect evidence, and then notify the salvage team to dispose of the body. ”

Ye Zhenzhen looked at Nan Zhiqiao while talking about her own method, as if she was asking Nan Zhiqiao's opinion.

Nan Zhiqiao nodded slightly, expressing his approval, "First collect the dammed lake water and dead pig specimens, and then go back to detect Vibrio cholerae, in order to prove whether this is the source of the cholera epidemic." ”

Zhu Wu, a high school student, was enthusiastic about helping and asked, "How much does it take to collect dead pig specimens, I can help drag them back." ”

Ye Zhenzhen smiled, admiring this kind and enthusiastic big boy from the bottom of her heart, and explained: "You don't need to bring a pig back, just collect some representative parts." ”

Ye Zhenzhen took out the sampling bag she was carrying, and was about to go down to the boundary of the lake under the hillside, just about to go down, Nan Zhiqiao grabbed Zhenzhen's arm, "I'll go down, you stay on it." ”