Water supply and water conservancy project

Shibikeng Reservoir is a medium-sized reservoir on Bankeng River, a tributary of Xiangshui River. It is located about 5 kilometers east of Huichang County and was completed in 1978.

The dam site of the reservoir is located in Xiaoba Village, Wenwuba Township, Huichang County, with a drainage area of 164 square kilometers. The backwater of the reservoir runs from the dam site to the earth bridge. The backwater length is about 10 km, and the water surface area is 3.82 square kilometers, showing a strip shape. The average annual temperature 19.3 degrees Celsius, the average annual precipitation 1.624 mm ... The average annual inflow is 4.42 cubic meters per second.

The project is a multi-year reservoir with functions of flood control, urban water supply, irrigation and power generation. The main benefits are as follows: (1) In the event of a once-in-20-year flood, the peak flow can be reduced 1.62 cubic meters per second. (2) 2,000 hectares of irrigated farmland. ③ The daily water supply in Huichang City is 30,000 tons. ④ The installed capacity of the power station is 2 290 kW, and the annual power generation is 8.5 million kWh.

The normal water level of the reservoir is 200.64m (assuming elevation, the same below), the dead water level 188.64m, the flood control limited water level 199.64m, the design flood level 20 1.7 1m, the check flood level 204.08m and the total storage capacity 60.

The project consists of main dam, auxiliary dam, spillway and water diversion system. The main dam and six auxiliary dams are homogeneous earth dams. The total length of the main dam crest is 140m, the crest width is 5.0m, and the maximum dam height is 36m. The spillway is located on the right bank of the main dam, and the gate is used to control the opening. The diversion tunnel for water supply, irrigation and power generation is located at the top of the left bank of the main dam.

Reservoir construction flooded farmland 158 hectares, demolished 62,000 square meters, and relocated 13 14 people.

Most of the reservoir areas are low mountains, located in the upper wall of Shicheng, Ruijin, Huichang-Xunwu fault zone. The exposed strata are mainly Quaternary loose accumulation layer and Caledonian intrusive granite.

In 2003, the main dam body, original diversion culvert, dam foundation seepage control and auxiliary dam body, spillway diversion channel and diversion system opening and closing frame were strengthened.

Tuanjie Reservoir, a large (2) reservoir in the upper reaches of Meijiang River, is located in Ningdu County, Jiangxi Province, 55 kilometers away from Ningdu County, and was completed in June of 1979 1 1. The dam site of the reservoir is located in Houjinshixia, Yuanbu Village, Luokou Town, Ningdu County, with east longitude 1 16 05' and north latitude 26.52', and the controlled drainage area is 4 12 square kilometers. The backwater of the reservoir reaches the Heping Ai Wu in Luokou in the east, the back beam of Yonghong Outer Bridge in Luokou in the west, the dam in the south, and the head of Wucun Village in Xiaotian in the north, with a water surface area of 655. A total of 46 rivers, including Jiaojian River, enter here. The annual average temperature 18.3 degrees Celsius, the annual average precipitation 1677.6 mm, the annual average inflow runoff of 420 million cubic meters, and the annual average sediment discharge of 77,500 tons, mainly concentrated in the flood season. The project is an annual regulation reservoir with flood control as the main function, taking into account power generation, irrigation and aquaculture. Main benefits: ① The water quantity of Meijiang River was adjusted, so that the residents of 43 village committees and 2,900 hectares of farmland in the lower reaches of Meijiang River 1 1 villages and towns were relieved of the flood disaster in the flood season. ② 1979 to 2005, the average annual power generation was12.8 million kwh. (3) Reservoir farms have established a "trinity" commercial fish breeding system with self-propagation, self-feeding and self-fishing. ④ Use hills, mountains and islands around the reservoir to develop diversified businesses. The normal water level of the reservoir is 242.00 meters (assuming elevation, the same below), the dead water level is 235.6 meters, the design flood level is 244.29 meters, the check flood level is 245.53 meters, the total storage capacity is 6.5438+45.7 million cubic meters, the flood control storage capacity is 25.3 million cubic meters, the Xingli storage capacity is 78 million cubic meters and the dead storage capacity is 42.8 million cubic meters.

The project consists of main dam, auxiliary dam, normal spillway, emergency spillway, water diversion system and its supporting engineering buildings. ① The main dam is a sand shell dam with clay core wall, with a dam height of 28m, a dam crest elevation of 248.0m, a dam crest length of 2 10.0m, a dam crest width of 5.0m, and a maximum dam height of 34.0m..② There are 6 auxiliary dams 16 in the reservoir, all of which are roller compacted homogeneous earth dams located on the right side of the main dam. ③ The normal spillway is located on the left side of the main dam, with the crest elevation of 236.0m and the total length of 214.0m; The spillway has a clear width of 20.0m, with two holes overflowing, and the clear width of each hole is 10.0m, which is controlled by two radial gates. (4) The emergency spillway is located on the right side of the main dam reservoir area and is a self-destructive earth dam. The crest elevation is 249.0m, the bottom elevation of overflow weir is 242.0m, the overflow width is 150.0m, and there is a concrete pier in the middle. ⑤ The diversion system and its supporting engineering buildings include power generation diversion tunnel and irrigation diversion tunnel, both of which are reinforced concrete circular pressure tunnels. The reservoir inundated 3 townships and 5 villages, inundated 0.04 million hectares of cultivated land, demolished 47,400 square meters of houses and resettled 3,082 people. Most immigrants were resettled locally, and a few moved away.

The reservoir area is located in the northeast of Ningdu County and belongs to hilly area. The riverbed above the Xiaotian is covered with pebbles, and the riverbed above the world is covered with sand. As the sand layer downstream becomes thicker and thicker, the riverbed gradually rises. The original riverbed in the reservoir area is U-shaped, the river width is mostly within 100 meters, and the water depth in dry season is generally less than one meter. The two sides of the Taiwan Strait are open, with hills and gullies in the south-central, mountains in the east, west and north, and numerous peaks. The strata are Jurassic-Cretaceous sandstone and conglomerate interbedded, and the exposed strata include sandy slate, granite gneiss, granite, sandstone and conglomerate. 1976 for safety reinforcement. (1) emergency spillway with clear width of 150m is adopted to reinforce the pier and strengthen the lining protection; ② The earth dams of main dam, auxiliary dam and emergency spillway are all raised by 2m; ③ The number of auxiliary dams increased from 10 to 16; ④ The main spillway was changed from 3 flat gates to 2 arc steel gates; ⑤ The amount of water diversion works increases accordingly; ⑥ The limited water level for flood control is increased from 24 1m to 242m m.. It was reinforced in 2002. Slope protection and reinforcement design of main dam and auxiliary dam, safety monitoring system design, termite control, emergency spillway safety monitoring system design, etc. In addition, a drainage station, four rainfall stations and meteorological observation facilities have been added. The flood control standard of reservoirs has been raised from 100 to 2000, the area of protected farmland has increased from 0. 1420 hectares to 0.2900 hectares, and the average power generation for many years has increased from 9.22 million kwh to1400,000 kwh.