1953 The measured peak flow at Tanghe Hydrological Station is 3500 cubic meters per second. That winter, the Tanghe River was regulated. In the spirit of "small water never leaves the beach, and big water never floods the bay", the embankment is built with a guaranteed flow of 3600 cubic meters per second. The project is from Liuyuan Village, Shangtun Township, tanghe county to the junction of Hubei, with a dike length of 84.5 kilometers, a dike top width of 3.5 meters and a flood height of 1.2 meters. The national investment is 6.5438+0.8 million yuan. In July 1955, the peak flow of Tanghe County reached 7620 cubic meters, and rivers generally overflowed. There are 473 dikes, 327 kilometers long, with 33,000 rooms/kloc-0. Sheqi county was flooded. At that time, the Yangtze River Basin Planning Office held a meeting of relevant personnel from Henan and Hubei provinces in Wuhan, and decided to comprehensively rectify the Tanghe River, implement flood diversion and detention, and repair dikes. Diqing Lake flood storage and detention area is built in Xinye County, with a length of 18km and a width of 2.5 km, with a maximum flood detention area of 32.6km2, a flood detention capacity of 80 million cubic meters and a maximum flood diversion flow of 300 cubic meters per second. Because of the limited flood detention, it has little effect on reducing flood peak and was later abandoned. 1957 and 1958 complete the task of dike maintenance.
On July 1965 and 18, the whole basin of Tanghe River was flooded, and the villages on both sides of Tanghe River generally flooded to the junction of Hubei Province, causing serious losses. From the winter of 65438 to the spring of 0966, according to the standard of ensuring 3600 cubic meters per second at Guotan Station in tanghe county, the dike below Shangtun was renovated and strengthened according to the standard of top width of 4 meters and flood height 1 meter, and some branch dikes, village dikes and Zhuangtai were added. The state invested 6.5438+0.2 million yuan and the masses raised 90,000 yuan. 1April, 1969, Songjiachang Reservoir on Biyang River, a tributary of Tanghe River, was completed, which can control flood1300,000 cubic meters and alleviate downstream water disasters.
1On August 6th, 975, the Tanghe River suffered a rare flood. On August 8th, the maximum peak discharge of Tanghe Guotan Station was 13400 m3/s, with 44 large breaches, with a length of 607 meters. After the flood, the Tanghe River was repaired, with a length of 104km, 9 culverts, 3,390 cubic meters of masonry, a safe flow of 6,000 cubic meters per second, a top width of 4 meters, and an superelevation of 1.2 meters, with a national investment of 3.8 million yuan. The flood control standard reaches 65438+ once in 00 years.
By 1987, * * dike 1 196 km, greening 85 1 km. Tanghe River in tanghe county has reached the flood control standard of 10, and Baihe River in Nanyang City has only reached 62% of the flood control standard of 20 years. huashan reservoir
Huashan Reservoir, located 40 kilometers northwest of Biyang County, is on the Weihe River and a tributary of the Tanghe River. The control basin covers an area of 76 square kilometers, which is a hilly area with poor vegetation. It was rebuilt on the site of ancient Marenpi. 1958 started in March and was basically completed in August. The original designed dam height is 15.5m, the spillway bottom width is 56m, and the bottom elevation is180.4m. The water conveyance tunnel is completed at the same time. Due to the low flood control capacity, the dam was raised by 2. 1 m in the spring of 1962. After the flood of 1972, the elevation of the dam crest was raised to184m in winter, with a thickness of 2.5m.. The spillway excavation auxiliary trough has a bottom width of 2 1m and a bottom elevation of 179m. During the flood of 1975, the reservoir area was the center of rainstorm, which played an extremely significant flood control benefit. After the flood, in order to further improve the flood control standard and engineering quality, the total storage capacity is 63.5 million cubic meters and the water storage capacity is 22.7 million cubic meters according to the flood control reinforcement with a return period of 5000 years 1, 976 ~ 1, 979. Grouting and slope protection were carried out for the dam; Add 1.2m high wave wall; The bottom of spillway is widened to 44m; The auxiliary spillway has a bottom width of 46m and a bottom elevation of 179m. The sand shell with clay core wall leads to dam failure, which is the earliest dam failure in the whole province, and will be caused by a flood in 5000 years. The designed irrigation area is 57,000 mu and the actual irrigation area is 8,000 mu.
Hushan reservoir
Hushan Reservoir, located at the foot of Hushan Mountain in Fuxiang Township, Mazhen City, tanghe county, is the Ugly River, a tributary of Sanjiahe River of Tanghe River. The control basin area is 1.99 square kilometers, belonging to the shallow mountainous area at the northern foot of Tongbai Mountain. 1958 started construction, 1959 completed the construction of temporary spillway on the left bank and water conveyance tunnel on the right bank before flood season. The elevation of the dam after completion is136m. The dam was built in the winter of 1959. It is a homogeneous earth dam with crest elevation 143.6m (143.5m), maximum dam height of 24. 1m (25.5m), crest width of 5m, breakwater height 1m and main dam length. 1975 winter, according to the flood control standard of once in 5000 years, a new spillway was opened, with a maximum discharge of 1050 cubic meter, with a total storage capacity of 87.36 million cubic meters and a storage capacity of 43.35 million cubic meters in Li Xing. The right spillway will be changed into an emergency spillway, and a dam will be built to break in case of a flood with a recurrence period of more than 5,000 years. The designed irrigation area is 6.5438+0.05 million mu, and the actual irrigation is more than 50,000 mu. Hydropower and aquatic products also played a role. After impoundment, the dam leaked water, and in order to protect the lives and property of the downstream people, it was approved by the Provincial Water Resources Department 1962 to spend the flood season. Then it was redesigned and built. From1July, 969 to1August, 978, it lasted for nine years and was constructed in five phases. * * The engineering quantity was completed1913000m3, including earthwork1769000m3 and stone/kloc. * * * 8.4 million working days, with a total investment of 4.2 million yuan, including 4.066 million yuan invested by the state,137,800 yuan raised by local governments, and 980,000 Jin of grain subsidies. Hushan Reservoir is a medium-sized reservoir which mainly focuses on irrigation, taking into account flood control, power generation and comprehensive utilization of fish farming. Its benefit scope includes 3 towns, 38 village committees and 362 natural villages in Mazhen. The designed irrigation area is 6,543,800+0,500 mu, including 85,000 mu of self-flow irrigation and 20,000 mu of water lifting. The effective irrigation area is 62,000 mu. 20 10 Hushan Reservoir is developed into Jiulong Lake Tourist Area.