Chapter 26 Surveying and Mapping of the Three River Estues
After a round of consultations, Secretary Ouyang and Secretary Li of the county party committee finally agreed on the survey results, and the Ministry of Water Resources audited the cost, and then according to the date and quantity of the project, additional manpower was assigned to build it half a month before the flood season next year. The entire Sanjiangkou project is managed and dispatched by the Ministry of Water Resources, and Diankou is only used as a supervision unit to test the quality of the project.
After talking about these conditions, the surveyor followed Han Laosan to the embankment collapse to measure and make statistics. When he came to the embankment at the mouth of the Sanjiang River, Han Laosan introduced the direction of the flood during the flood season and the fundamental reasons why it became the embankment collapse and told them about it.
The leading surveyor recorded while watching the geographical location of the dam failure, he found that the water of the three rivers is gathered at the mouth of the three rivers, and the water can pass smoothly through a waterway downstream in the flood season, the water flowing from the confluence of the three rivers looks gentle and not urgent, but there is only one drainage channel, the river surface is calm, the water surface is not wide, resulting in the flow rate of the water is also slow, and the turbulent water can not be discharged downstream, so it is affected by the flow rate, causing the water surface to rise, rising to a certain height, it will burst the embankment from another weak place, and it happens to be close to the place of the mouth of the three rivers, there is a large canyon area, and all the water will be washed to this weak place, so as to form the current landform。 The six people discussed for a while, if only by repairing the berm, increase the height of the embankment, its flow rate is still very slow, the water level will follow the height of the embankment has been rising, and finally it is still overflowing, repairing is equal to white repair, the only way at present is to widen the downstream of the existing river, so as to increase the flow and flow rate of the river, with this condition, even if the flood season comes, the water potential is big and fierce, it can also be discharged smoothly, so that the flood situation can be completely solved, and the problem of poor drainage can be fundamentally eliminated. Several people agreed and nodded to each other, and then first did a benchmark mapping, surveyed the height of the embankment, calculated the maximum discharge, and how many cubic meters of flow per second.
Recently, a few teams in Sanjiangkou saw six surveyors wearing glasses carrying surveying and mapping instruments, adjusting the angle of the surveyors on the riverbank, registering them digitally one by one, writing down groups of surveying and mapping data, and running around on the riverbank. Watch them set up the instrument, map the focal point, follow up the angle, gesture, and slowly move the corresponding point.
The people who were standing by and watching the excitement didn't know that they were carrying the tripod, shouting left, left, left, right, right, and right, and they were a little confused, and they didn't know what they were trying to do.
Someone didn't understand, so they asked Han Laosan: "Third brother, you take a few of them to the embankment, carrying a tripod, and the shelf is carved with messy grids, running around, and aiming around, what are you going to do on the left, left, right, and right?"
Han Laosan replied as if he didn't understand: "Surveying and mapping, surveying and mapping, surveying and mapping is to measure the size of the project, what's so strange about this!"
"Third brother, you don't need to run around for this measurement, let's measure every section and every section, you see that this has been measured down the hillside downstream after crossing the embankment, and they are still going down, what is the reason?"
Han Laosan was also confused when he saw it, and couldn't figure out what they were going to do, so he caught up and asked: "Fang Gong, are you mistaken, we are building a berm, what are you doing downstream?
I saw that the surveyor surnamed Fang glanced at Han Laosan and explained: "Uncle Han San, we are going to widen the waterway of the downstream mountain, only in this way can the flow rate be increased and the flood water can be quickly discharged downstream, as long as the downstream water is discharged smoothly, no matter how big the upstream flood looks, it will not help, this is called the rapid retreat, do you know?"
Han Laosan finally understood what the surveyor Fang said, so he said, "You mean, widen the downstream river channel so that the water is not blocked, is that what you mean?"
Fang Surveyor nodded and smiled, and replied: "The third uncle is really powerful, just a little bit, amazing, amazing!"
Han Laosan smiled and never followed them again.
When Secretary Ouyang and Secretary Li arrived, the shadows of the surveyors were gone.
Secretary Ouyang asked Han Laosan: "Han Laosan, what about the surveyors you brought, why are they gone?"
Han Laosan said: "They went downstream, saying that the river was too narrow, and that the river should be widened, saying that as long as the flow rate of the water increased, no matter how big the flood was, it would not be a problem, and said that the torrent retreated!"
Secretary Li smiled and said: "That's what I mean, change the place with too many curves and let it go straight as much as possible, so it's better!"
Secretary Ouyang took out the water system map, handed it to Secretary Li, pointed to the biggest bend, and said: "Secretary Li, this river has the most bends here, and the river is relatively narrow, we can go down the bamboo raft to see if we can find a place that can be diverted, and then we will make a decision!"
Secretary Li nodded and replied, "Take advantage of the time, let's go and see the situation first!"
Secretary Ouyang accompanied Secretary Li to the embankment to ask for a bamboo raft, called Han Laosan to support the row, Secretary Li and Secretary Ouyang stood on the bamboo raft, along the river all the way to watch the water conservancy environment.
The bamboo raft traveled along the water, walked for three or four hours, and found the big bend marked on the map of the water system. ”
Secretary Ouyang looked at this big bend and replied: "Secretary Li, the big bend you are talking about is the biggest bend on the water system map, and it should be the culprit of this river! The bend is big and the flow speed is slow, resulting in overflowing embankments! You see, isn't it, change this bend and let it flow from another valley, so that the pressure of the river can be relieved, the two river channels, as long as the water is divided, no matter how big the water is, it can be easily decompressed and unimpeded!"
Secretary Li nodded, asked Han Laosan to dock the bamboo raft, climbed to the top of the mountain, picked up the telescope and looked at the terrain, and found that there is a relatively spacious valley at the foot of the bend mountain, the valley mouth looks very spacious, and there is a small stream, from the stream to observe, it is found that its terrain drop is very large, if the water is discharged here, such a big drop, it will definitely flow down, this valley mouth is separated by a mountain, that is, a big mountain next to the bend is blocked, if you want to lead the water to this valley mouth, you have to dig a river channel out of this mountain, as long as this river leads to that canyon, no matter how big the flood is, it can be unimpeded。 He pointed to this canyon and said to Secretary Ouyang, "Secretary Ouyang, come and take a look, look at the direction of my finger!" and handed him the telescope.
Secretary Ouyang took the binoculars, looked in the direction of Secretary Li's finger, and found that there was really a big valley mouth there, judging from the slope of the small stream at the mouth of the valley, the drop was very large, and it was indeed a good place to discharge floods. So he said: "This canyon is simply the savior of this river, and as long as this drainage channel is opened, we will no longer have to worry about the trouble of the river during the flood season! However, there are still several miles of mountains blocking the bend here, and this will undoubtedly increase the amount of work! This is not a small project, compared with the amount of work at the mouth of the three rivers, it is only big and not small, is this ······?" Secretary Ouyang didn't dare to say anything further, because this was an extravagant hope, and it was already great to be able to solve the matter of repairing the embankment at the mouth of the Sanjiang Estuary.
Secretary Li smiled and replied: "Secretary Ouyang, as long as we can solve the problem, we must solve it! In this way, there will be no worries in the future! Are you right?"
When Secretary Ouyang heard Secretary Li say this, he couldn't wait to do what Secretary Li said, this kind of good thing that can't be found with a lantern, where to find it, since Secretary Li sent it to the door, then why wouldn't he do it!
Secretary Li smiled heartily and replied: "Secretary Ouyang, we don't need this, do we still need that for this relationship?
Secretary Ouyang replied, "Yes, we are brothers! Good brothers!"
"Hahahaha······"