Relevant records of Lvshui River

Out of Shengxian Valley in Chenggu County, Shaanxi Province, it flows into Pingba and Zhi Ming Township. In the second year of Han Zhuo's photography (AD 7), there was a myth that the public coffin (house) in Sichuan and Tang Dynasties was immortal, and her husband was called water because he couldn't go out into the left valley. In ancient times, water is water. The Qing Dynasty's "Hui Dian Tu" was mistaken for clear water, and it is still in use today. Luanhe water source is located in the south slope of Tushan Mountain on the west side of Taibai Mountain in southwest zhouzhi county. Southwest China flows through Yangxian County and enters Wenjiaba, Shicaohe Township, Chenggu County, Shaanxi Province. Tunxi Huijian flows downstream, flows southward through Cao Shi River, Panlong, Zhuanxi, Taoyuan, Xiaohekou, Shuangxi, Shuituan, Orange Garden, Xujiamiao, Yuan Gong, Lvjiacun, Baoshan and Wulangmiao, and flows into the Han River.

The total length of the main stream is167.5km, of which Chenggu section is100km. The basin covers an area of 2340.2 square kilometers, of which the area above the mouth of the Sage Valley is 2 143 square kilometers. Its drainage area is 1092.2 square kilometers in Chenggu County, Shaanxi Province. The average annual runoff is 65.438+0.99 billion cubic meters. The river channel ratio is reduced to 3 ~ 15%. The upper reaches are 40-50 meters wide, with dense forests and water conservation. The slope is steep, the narrow valley and Bitan Lake alternate with each other, and the water flows rapidly. The middle reaches are 60-80 meters wide, with a small slope, and many mountain basins and dams are developed. The downstream is 200 ~ 300 meters wide, with gentle water flow, wide river surface and developed beach center. The average discharge of Shengxian Village is 34.69 m3/s, the maximum discharge is 3130m3/s (1July 980) and the minimum discharge is 0.05m3/s (1June 979+June 06). The water resources of Lianshui River are developed and utilized early, with large hydraulic reserves.

Yang Fill Weir, the main weir of Weishui River, is located on the east side of Weishui River, west of Xiying Village in this treasure mountain, and was called Zhangliangqu before Song Dynasty. "Notes on Water Classics" (1990 edition by Chen Qiaoyi) Volume 27 says: "Qinshui is also the tomb of seven women in East longitude, and there is water in the tomb. ..... There are seven women's pools in the north of the water, and there is a bright moon pool in the east of the pool (located in Baoshan, see "Re-engraving the Records of Hanzhong County"), which is like a crescent moon, and they are all connected, which is called Zhang Liangqu and built by Gailiang. " Suishui flows south (east) after Doushan, east (south) after Lv Cun and south (east) after Baoshan. "There are seven female ponds in the north of the water", that is, the section from Dingjiacun to Baoshan in the north of Suishui today, is the western section of the weir that Yang later filled. In the first year of Emperor Gaozu (206 BC), Hanwang once stationed troops in this county, now Hanwang City. According to Records of Historical Records and Biography of Liu Hou, Sean has never been to Chenggu. But when Emperor Gaozu was stationed in this county, he organized people in this area to develop water and soil resources. In the Neolithic Age, there was a village where ancestors lived in groups (the site of Danjiazui). Later, people built ponds to store water and irrigate fields. At the beginning of the Han Dynasty, in order to expand the irrigation area, the seven female ponds were further renovated, and water was introduced into the ponds to make the seven ponds blend. People can name cities, canals, platforms, etc. After the monarch and minister who developed agriculture in the early Han Dynasty. "Remake Hanzhong Records" also says: "Yang fills the weir ... to stop the flow of water, and the stone is a weir. According to legend, it was also created by the late master (Xiao He) and the peaceful Yang Hou (). " From the first year of Longxing in the Southern Song Dynasty (1 163) to the first year of the main road (1 165), "Knowing Yangzhou, after the founding of the People's Republic of China, Yang Dayou improved" ("Rebuilding the Records of Hanzhong County"), so it was renamed Yang Fill Weir. This dredging project is relatively large, and Yang himself wrote a poem: "One house is demolished and turned into a river, and there are many grievances. When you know that it is a thousand years old, all grievances are exhausted. " "Its canal goes around Baoshan and down to Yangxian County" (see Epitaph of Yang in Five Years of Avenue (1 169)). The canal is divided into three or seven parts. Three points belong to Chenggu, which governs six places, namely Ding Cun, Baoshan, Liucun, Shangsu Village, Suxia Village and Liujiazhai. Seven belong to Yangxian County, which governs eight places (omitted). The weir belongs to one place, and the pipe is divided into two bureaus. The so-called "Sanqi" is based on the proportion of stall operators, and the amount of land is different. In the 23rd year of Wanli in the Ming Dynasty (1595), Chenggu County made Gao and Yang County magistrate Zhang Shushen unanimously decide to follow the example of Wumenyan's practice of "opening five holes and building two dikes near the shore". When the water rises, it will drown the wooden door, and when the water disappears, it will flow safely to the wooden door. "This is a major reconstruction after Yang in the Southern Song Dynasty. At that time, Yangxian irrigated 7000 mu of farmland and cultivated farmland 18000 mu. In the 9th year of Jiaqing in Qing Dynasty (1804), Dinglongzhang in Chenggu County and Zhang Zhonghua in Yangxian County rebuilt the weir gate, built more dikes and planted trees to reinforce the embankment foundation. In the fifteenth year of Jiaqing (18 10), the river rose repeatedly, the weir was blocked 100 feet, and the canal was destroyed10 feet. Hanzhong magistrate is as strict as investigating cases. In the 16th year of Jiaqing (18 1 1), land was bought along the river in Xiying Village to reopen the river. The south bank (Linjiang) was made of Heguang stone, tung oil and lime, covered with bamboo cages and built with five holes, which were six feet and four feet long. Chenggu has 1.498 mu of irrigated land, and Yangxian has 1.0840 mu of irrigated land (rebuilding Hanzhong County Records) (the number of irrigated land in Chenggu is obviously wrong according to three Yang and seven, and it should be 4645 according to three series). In the seventh year of Daoguang (1827), the Goose Weir was rebuilt. Since ancient times, both Beijing and other counties have set up weir bureaus to fill Yang's weir. The stone, bamboo, wood and work used in the annual repair are all distributed according to Sanqi. " Foremen and workers are hereditary contractors and can work for half a day. Shake the pile and dismantle the cage in an attempt to burn firewood, tear down the old and replace it with a new one, just to make money. "Due to improper employment and lax supervision", the weir is getting worse and worse, the canal is becoming more and more blocked, and money (water fee) is becoming more and more difficult to pay. "canals and dams are built every year, but flood control and emergency rescue are not carried out according to the routine. When water is scarce, the upstream occupies water, the downstream dries up, or holes are dug privately, and water disputes continue. In the 28th year of Guangxu (1902), "the flood burst and the weir collapsed". After the repair, the five holes were changed to three holes, but they were still ugly and simple. " There are stones in the cage, piles in the cage and water in the cage. " In the first year of the Republic of China (19 12), "the cage house collapsed and the house was broken." In the 4th year of the Republic of China (19 15), "Building a cage house in the west, building a workshop in the south and rebuilding the second gate". In 6 years (19 17), Xiule Building was founded. In the eighth year of the Republic of China (19 19), the bank was consolidated and the channels were cleared. In 9 years of the Republic of China (1920), there were a large number of personnel in the weir, such as water conservancy bureau, general manager, chief affairs, account management, weir difference and labor services. And most of them are given for nothing. The 20-kilometer main canal has different depths and widths. There is water back to the river at the upstream three-point weir, and there is no water for transplanting rice at the downstream seven-point weir. Every time the water is released, either the hole is broken or the canal is broken. In the thirty-seventh year of the Republic of China (1948), all the irrigation areas in Yang Yan were brought into Suihui Canal for water supply. Due to the expansion of irrigation area year after year and the shortage of water resources, rice production has generally decreased. 1950, the irrigation district sent representatives to request the establishment of Yang Yan Water Conservancy Committee to irrigate the city and arrange 6282 mu of farmland. 1952, the people of Yangxian county demanded that the Yang irrigation weir be added according to the ancient system. After consultation between the two counties and with the consent of Hui Hui Canal Administration, 3 183 mu of paddy field west of Ma Chang in Yangxian County was returned to Yangguan weir for irrigation. Since ancient times, the irrigation proportion of "three rivers and seven cities" has become "seven oceans and three cities" In the same year, the weir and dam were renovated, and the water drop and spillway were built in Eryan, and the main canal was excavated by 0.3 ~ 1.0 m to ensure the water supply for transplanting rice at 1953. 1955, paving workers in two counties cut and bent the main canal of 1 1 km to 9.6 km, and opened a drainage ditch at the end of the canal to discharge the tail water into the Han River. There are 39,000 vendors in Chenggu, and support from two non-beneficiary areas has been mobilized. Since then, the face of irrigation area has changed. 1959, Tian Yang weir was changed into a management station, which belongs to the orange orchard water conservancy association. 1960 fix the bucket mouth, make a hole and set a gate to control the water quantity, and cut the bucket canal straight. 1962, the dam was destroyed by the flood for 50 meters, and it was repaired in time. 1962 to 1965, improve the irrigation area, straighten four bucket canals and add two return canals; The control gate of Eryan was built and the construction facilities of Doudou Canal were repaired. The canal system is smooth, and 3000 mu of one-season field is changed to two-season field. 1967 transform the bamboo cage weir dam into a wooden frame stone, that is, a "sheepfold" structure. From 1972 to 1974, the state invested 60,000 yuan to build three pumping stations in Ding Cun, Sucun and Liujiazhai, and 3 10 kW electric power was used for drought relief. At the same time, two reservoirs, Dagangou and Laohugou, will be built, with a storage capacity of 165438+ 10,000 cubic meters. 1975 organize irrigation area, cancel series irrigation, and drill 28 wells in the irrigation area of this county to prepare for drought resistance. 1977 The dam was rebuilt for three consecutive years, and a mortar masonry dam with a length of 1 10 meter was built. 1980 was destroyed by the flood for 70 meters. 198 1 year was hit by floods again, and all the old and new weirs and dams were destroyed. Reconstruction began that winter, with steel cages filled with stones and covered with lead wire mesh. The dam is 400 meters long and crosses the main canal at an angle of 75 degrees. The weir canal restoration project took 2 years to complete. Irrigation canal system diagram of stone carving Yang Guan weir 1987 ~ 1990. The weir dam was destroyed by water for four consecutive years, and the restoration investment was 1 1.5 million yuan, and the labor was 1 1.3 million yuan. By 1990, the project is stable and complete, and the water capacity of the main canal reaches 3.55 cubic meters per second. There are 16 canals in the whole irrigation area, and there are 13 canals in this county, which irrigates 675 1 mu and 2586 mu in Yangxian county. Wumen weir Wumen weir head is located in the southeast of Xujiamiao Town Street and on the west bank of Suishui River. Song Shaoxing was called Tang Palace years ago. When it was established, there is no exact record. In the 10th year of Jiaqing, Qing Dynasty (1805), Mu's Official Resume of Tang Che Fenfen stated: "The Duke of Tang started in the Han Dynasty, irrigated the fields with small canals, and flowed to the bottom of the nose (Doushan) and returned to the river (Suishui). In the third year of Daoguang in Qing Dynasty (1823), Tang Gongche Water Conservancy Monument said: "Wumen Canal really started in Han Dynasty. According to legend, since then, the entrance to the canal has stood tall. "Tang Gong is Tang Gong family (cloud). According to the "Tang Gong Yun Xian Bei" written by Emperor Ling of the Eastern Han Dynasty, "Xin Mang, the Tang Gong Fu, lived for two years (AD 7) and was a county official. When he met a real person, his family was promoted to immortality. "Although it is a myth and legend, it is named after the Tang Palace, and it is credible for later generations to say that it began in the Han Dynasty. Years ago, in Shaoxing, Southern Song Dynasty, there were nine wagons in Shangx to irrigate the land around Wanjiaying, Zhuyuan, Houwan and Xinmayuan in Xujiamiao Town. "Miaoyan Garden Monument" in Song Dynasty said that "there are thousands of rice beds and thousands of fireworks", which refers to the irrigation area of Tang bus. But at that time, Suishui reached the foot of the steep mountain, and the mountain was full of stones. Tang Gongshui could not cross the steep mountain, so he flowed to the steep mountain and returned to the river. In the early years of Shaoxing in the Southern Song Dynasty (1131~136), the people in the irrigation area were "competing for the peak (mountain)" and "crossing the river by wooden trough" to the north of Doushan, and the water began to flow down the mountain to irrigate 3,000 mu. The head of the weir in the Tang Dynasty, with five horizontal ditches, uses danger as the dike. Therefore, the Duke of Tang changed his name to Wumenyan. Later, the wooden trough built in Doushan gradually formed "cutting wood into a trough and gathering stones to live in it" (see "Shixia Age of Wumen Weir"). The number of wooden troughs has increased from one to many, the flow rate has increased, and the irrigation area in Doushannan has gradually expanded. Before the Yuan Dynasty, Wumen Weir "irrigated more than 40,840 mu of land and plowed 70 mu" (Jia's Wumen Weir Monument in Yuan Dynasty). Because the weir crosses the bucket mountain and cuts firewood into a canal, it takes a lot of bamboo and wood and manpower to repair it every spring. In summer and autumn, there is a slight rainstorm and rain, and a rising tide lifts all boats, often drifting away the wooden canal, and the rice is thin. In the seventh year of Yuan Dynasty (1347), it collapsed without cause in August. County magistrate Yin Puyong urged Yan Chang to "serve Dong Gong, summon metallurgists, forge tools, and lead grinders (masons) for more than a hundred times." Burning it with fire, quenching it with water "and stones" all collapsed violently. The removed stones still block the old canal ",and so on. In the eighth year of Zheng Zheng (1348), in order to improve the irrigation conditions in Doushan south irrigation area, a stone canal with a length of 18, a width of 1 and a depth of four meters was built at Wumen Weir (see Wumen Weir Monument by Yuan Jia and Li Shen for the above quotation). However, due to the narrow stone canal, Doosan gradually destroyed over the years and the flow decreased. In case of drought, Doushannan irrigation area was "scorched". In the fifth year of Hongzhi in Ming Dynasty (1492), Hao Sheng, the satrap of Hanzhong, was appointed as the county magistrate, leading more than 1000 husbands and craftsmen to build the Wumenyan stone canal (gorge) by means of fire and water quenching. The canal is four feet wide and two feet deep, and the flow rate is increased. The downstream canal system is extended by six or seven miles, which makes Wumenyan "the canal water swings in the fields". At that time, the main canal of Wumenyan surrounded Doosan, along the eastern edge of the hilly slope of Lvcun Township to Caojiacun and Zhengjiabang, and then along the southern edge of the hilly slope to the west via Yuanyang Bridge, Wang Jiaqiao (North) and Gaojiacun to Longtou Temple, and then turned south to Shaheying. The irrigation area includes the first and second terraces north of Hanbai Highway and west of Lvshui River. Because of the long canal system, large irrigation area and insufficient water, Wumenyan Irrigation District has strict restrictions on changing dry land into paddy field, and cannot be expanded at will, forming a unique farming system. In the fourth year of Wanli in the Ming Dynasty (1576), Qiao Qifeng, the magistrate of a county, led the masses to build a stone ridge at the first five holes of the canal to "build a long foundation"; Build a living weir downstream (i.e. repair and retreat sluice, called Xialongmen) to discharge flood tide; The stone gorge is made of stone to avoid the danger of breach. There are three Yuji temples with more than 20 official rooms in the west of the weir head, and the outlets of each cave are renovated to make the water evenly distributed (see Huang Jiucheng's Rebuilding Wumen Weir). In the 23rd year of Wanli (1595), Gao, a magistrate of a county, donated money to replace the wooden rolls at the water entrance of each cave with stones, and repaired them according to Qiao Qifeng's old rules. In the 11th year of Kangxi (1672), 8th year of Jiaqing (1803) and 11th and 12th years of Jiaqing (1806, 1807), Wumen Weir was repaired many times. In the 15th year of Jiaqing (18 10), the 36*** irrigated land of Wumen weir was inspected, with an area of 4 1030.54 mu (the inscription of Wumen weir field was inspected). In the fifth year of Daoguang (1825), 33,997 mu of farmland was irrigated by the whole weir (Wumen weir counted farmland monuments). In the sixth year of Daoguang (1826), the dike was damaged twice by water. In the seventeenth year of Daoguang (1837), the second hole at the head of the canal was washed away by water, and only half of the third hole was left, and the pier was also washed into a trench. So "rebuild the bottom, build it in contrast, process and add materials, and repair it from reality" ("Rebuilding Five Holes and Adding Temple Inscriptions"). In the twenty-first year of Daoguang (184 1), in case of heavy rain, sand and stones merged, the river regime became higher and higher, and the entrance of the cave was blocked, so the original sluice (that is, Xiaolongmen) was transformed into a sluice for washing and washing sand. There was only one door in the old one, and it is easy to be three today; The old one was eight feet wide, but now it is two feet wide; The old depth was six feet, but now it is two feet and five inches deeper; This old wooden bridge has been changed into a stone bridge. After the tunnel is completed, there will be no obstacles, and the waves will reach "("Rebuilding the Small Longmen Monument "). In the second year of Tongzhi (1863), the flood destroyed the canal, and "the weir pulled out its roots, and the field was lost." "Tongzhi seven to nine years (1868 ~ 1870), there are three dams. Zhou Yaodong, the magistrate of a county, led the masses to build it. " In the canal, the rock is split into the inner side, pebbles are used as cages, and water yards are set to kill the water. "At the edge of the weir, the bottom of the roll is bare stone, and the ebony is put into the pile to deposit sediment ...". In the eleventh year of Tongzhi (1872), the restoration was completed ("rebuilding the canal bank of Wumenyan"). During the period from the seventh year to the twelfth year of Guangxu (188 1 ~ 1886), the East Waterway and Guanquling often burst, and the water fee was paid every year for restoration, and the 600 yuan was shared per mu. The fields are decreasing day by day, and the whole weir irrigates 34 128.74 mu of fields. In 10 (192 1), the dam collapsed. Exploring the reasons, "knowing that the bottom stone of the water tunnel is too high and the foundation is not firm", the bottom of five tunnels will be lowered by 0.5 meters. "Afraid of the sudden rise of water and the overflow of Hong Tao, an inverted gantry (that is, a side weir) was added to the left side of the gantry to block the water potential." 12 (1923) rebuilt the inverted gantry, deepened the foundation, rebuilt the five-hole entrance platform, and continued to build Xihekan. In 22 years (1933), Zhixia was flooded. In mid-June, "the shock wave ran over the super tunnel beam, destroying the canal ridge by dozens of feet, and both tunnels collapsed." At the critical moment of water use, Zhao Shoushan garrison commander sent private commander Li Wei to build a sudden weir (temporary canal) to get water. In mid-July, "the water rose again, and both the old weir and the pointed weir collapsed from the east, and the cave was leveled at once." Urgent repair of the canal head, three layers of bamboo cages under the foundation of the outer sill, more than 50 feet long. In this restoration, the abandoned canal head fell to Longmen. After autumn, the construction resumed, and the bottom of the cave deepened, which was more than six feet lower than before. The bottom of the cave is covered with stone strips, and the edge of the cave is covered with stone strips. The middle is made of lime tung oil mud, which is tired layer by layer. "It was completed in April of the second year. The bottom of the five holes was renovated twice in the Republic of China, which was about 3 meters lower. In the autumn of 24 years of the Republic of China (1935), the wooden rolls and bamboo cages of the river weir were washed away by the flood and were repaired in the same year. At that time, "Wumen Weir's irrigated farmland (50,000 mu), large project and meticulous management were the highest among counties in southern Shaanxi" (Construction Weekly, Yang Bingkun's Water Conservancy Investigation Report of Chengyang County, Nanpu, Hanzhong). In May of the 37th year of the Republic of China (1948), the Hui Hui Canal was completed and irrigated with water. Since then, Wumenyan Irrigation Area has been merged into Huihui Canal Irrigation Area. After that, the irrigation area of Suihui Canal expanded year by year, and the water quantity was insufficient. In order to tap water sources and make full use of river leakage, the masses jointly applied for repairing Wumen weir. 1In March, 1952, the county people's government approved the establishment of Wumenyan Water Conservancy Construction Committee, and the people in the four townships of Wulangmiao, Dujiacao, Lujiacun and Majiadian raised 2,345.85 yuan (converted into new currency) to repair the old weir.1In May, 1952, 5,300 mu of paddy fields were allocated from Suihuiqu irrigation area for Wumenyan irrigation. 1953 county people's government approved the establishment of wumenyan water conservancy Committee. Reinforcement 1954 weir crest. From 65438 to 0958, Wumenyan Water Conservancy Committee was changed into a management station, which was under the leadership of the leading water conservancy association. From 1960 to 1962, the annual flood washed away the bamboo cage dam and repaired it with deterioration. From 1963 to 1966, the irrigation facilities in the irrigation area have been completely improved. 1 1.9 km, the ancient main canal was cut straight by 8.9 km, and the Doushan stone canal was transformed into two sections of open culverts, with a length of 284 meters. Eight ancient tunnels and 22km canals were merged, and three bucket canals and 1 auxiliary bucket canals were built. After improvement, the flow rate of the main canal is 2.5 cubic meters per second, and the paddy field in the irrigation area is expanded to 7 1.26 mu. The dam construction follows the traditional engineering technology and needs to be maintained every year. The riverbed is cut down year by year, and the weir head is built higher and higher, which is easy to be washed away by water. 1963 weir crest is fixed by pile foundation. 1968: The head structure of the canal was rebuilt, and the simple bamboo cage rockfill dam was changed into mortar rubble to slow down the back slope of the weir dam, and the foundation of the weir dam was piled with cages to adapt to settlement, with a dam length of 374 meters. The project was built by stages, and 1976 ended. The irrigation area is 9300 mu. 1July 1980, the flood peak of Lianshui reached 3 130m3/s, and the dam burst 15m. 198/kloc-0 from July to August, the number of flood peaks dropped several times, reaching 2640 cubic meters per second, and the dam was damaged again. The state subsidized 6,543,800 yuan+0.5 million yuan to reinforce the weir and dam with steel bars. The upstream Xibahe levee burst 3 14 meters, which diverted the mainstream and dried up the mouth of the canal. The state subsidizes 43,000 yuan for maintenance. 1983 The dam broke 72 meters in flood, and the state subsidized 42,000 yuan, which was repaired by filling stones with reinforced cages. At this point, the dam is relatively stable and the irrigation facilities are perfect, with 7350 mu of irrigated land and irrigated land 1950 mu. From the improvement of irrigation area in 1965 to the completion of dam reconstruction in 1985, there were 82,900 cubic meters of earth and stone in 20 years, including 8,840 cubic meters of masonry and 323,000 workers * * *; The investment is 335,500 yuan, including national subsidy135,500 yuan. 1986, the state subsidized 600,000 yuan, and the masses raised 750,000 yuan to build the head sluice (Longmen) and highway bridge. From 1987 to 1990, the state subsidized163,000 yuan, the masses raised 53,000 yuan, invested 85,000 people, reinforced dams, lined canals for 4.3 kilometers, and repaired three ditches. Main lined canal 1 km. 1984, wumenyan was listed as a key cultural relics protection unit in the province, and the wumenyan cultural relics management office in chenggu county was established. The state allocated 20,000 yuan to repair Guanyin Pavilion and other buildings according to the ancient samples. The Yuji Hall and Taibai Building at the head of the weir are all antique and brand-new, making Wumen weir, an important water conservancy project, a tourist attraction. Baizhangyan Baizhangyan head is located in the east of Lianshui River in the south of Qingshan, and the dam is about 100 meters long, hence the name Baizhangyan. The weir irrigates the paddy fields around Yuan Gong Town, and the tail of the weir directly reaches the weir irrigation area in Tian Yang. When Baizhangyan was established, there is no exact record. In the first year of Xianfeng in Qing Dynasty (185 1), Wugong (Wu Zixu) Temple was rebuilt, and there was a statue of high-impedance Liu Bang in the temple. Whether the ancient canal weir here is called Baizhang weir or not, it is really early to develop water resources and build canals to irrigate fields here. Due to the early development and utilization of water and soil resources, the Tanggong irrigation area and the west of Suishui in this area became the most prosperous areas in this county in the Jin Dynasty, so the Northern Wei Dynasty moved to the county to govern this area at the beginning of the year. By the Ming Dynasty, Baizhangyan and Yangzhanyan irrigation areas were in front of Gonghe and Yucun, "between the two townships, the word is beautiful, the soil is fertile, and the tax is forced to serve one city" ("Baoshan Temple inscription"). However, Baizhangyan's money and grain are "heavier than other weirs" (Baizhangyan Gao Gongming). According to these accounts, Baizhangyan (which should be a canal weir in Baizhangyan irrigation area) is said to have been built in the early Han Dynasty, which is more credible. In the 26th year of Wanli in Ming Dynasty (1598), the magistrate of a county made a detailed investigation on the "traffic jam reason" of Baizhangyan, and donated dozens of dollars to build "three bridges and three ditches". Each hole is four feet wide, and there are still dozens of feet on both sides of the river. In case of fierce water, use the entrance of the gate to resist floods and prevent the river from being washed and silted again. " People rely on the power of chess to name it "High Arch Bridge" ("Baizhangyan High Arch Monument"). Baizhangyan irrigated 3720 mu of farmland in the Kangxi period of Qing Dynasty, and more than 4700 mu in the Qianlong period, which was washed away by fierce water, and irrigated 3700 mu in the 18th year of Jiaqing (18 13). 16 (1927) irrigates more than 3,500 mu of farmland every year. "The weir worker lays the foundation with hard stones, rolls the stones with wood, and spreads the weir body with bamboo cages. Farming with straw and sand forms a slope ratio of 1 6 in the upstream, 1 5 in the downstream, and the top width is 3 meters. The first hole in Hong Men is 6m near the water intake, which is1.5m lower than the weir crest. The water intake is a three-hole diving hole, and a gate is added in flood season. In 37 years of the Republic of China (1948), the irrigation area was changed to Suihui Canal, the project was abandoned, and the high arch bridge and Wugong Temple were destroyed. The head of the high weir is located at the mouth of Beigoukou deep in the river, and the weir body is made of rockfill. Water was diverted from the west bank of Lianshui, and more than 800 meters of water was divided into irrigation fields. When the weir was built has not been tested. In the third year of Wanli in the Ming Dynasty (1575), Qiao Qifeng, a magistrate of a county, rebuilt it in the twenty-seventh year of Wanli (1599) (Huang Jiucheng rebuilt the Six Weirs). The weir has a large amount of water diversion, which was irrigated in Ming and Qing Dynasties 1800 mu. 11~18 (1922 ~1929) year, the newly-opened parking field of Wumen weir and Wanjiaying Guanba village were reclaimed, and the irrigated land was expanded by more than 2,000 mu. The weir dam is made of stone and bears the impact of flood. The gullies along the canal are interlocking and unstable. In 37 years of the Republic of China (1948), the irrigation area was brought into Suihui Canal for water supply, and the weir canal was abandoned.