| Ertan Dam | |
| Name Official: | 二灘大壩 |
| Location Map: | China |
| Coordinates: | 26.8208°N 101.7811°W |
| Dam Crosses: | Yalong River |
| Location: | Sichuan, China |
| Dam Length: | 774.70NaN0 |
| Dam Height: | 2400NaN0 |
| Dam Type: | Arch |
| Plant Hydraulic Head: | 1890NaN0 (max gross) |
| Dam Volume: | 58570000NaN0 |
| Construction Began: | September 1991 |
| Opening: | 26 December 1999 |
| Owner: | Yalong River Hydropower Development Company, Ltd. |
| Spillway Type: | 7 x crest outlets, 2 x flood tunnels |
| Spillway Capacity: | 62600NaN0 Tunnels:74000NaN0 |
| Res Name: | Ertan Reservoir |
| Res Capacity Total: | 58000000000NaN0 |
| Res Catchment: | 1164000NaN0 |
| Res Surface: | 1010NaN0 |
| Plant Turbines: | 6 × 550 MW Francis turbines |
| Plant Capacity: | 3,300 MW |
| Plant Annual Gen: | 17 TWh |
| Status: | Operational |
The Ertan Dam is an arch dam on the Yalong River, a tributary of the Yangtze River in Sichuan Province, in southwest China.
The dam has six hydroelectric generators, each with a generating capacity of 550 MW. The total generating capacity of the facility is 3,300 MW, one of the largest hydroelectric stations in China. The annual production is 17 TWh, and until December 5, 2006, it has produced over 100 TWh of electricity. Construction of the dam started on September 1991 and was completed on December 26, 1999.[1] [2] A total of 126380000NaN0 of material was excavated during construction.
The Ertan Dam was designed by the China Hydropower Engineering Consulting Group Survey and Design Institute in Chengdu, and was constructed and is currently operated by Ertan Hydropower Development Company Limited, the owners of the dam. The company is invested by State Development and Investment Company (52% share) and Sichuan Chuantou Energy Limited (48% share).
The Ertan Dam is a 2400NaN0 high and 774.70NaN0 long double-curvature arch dam. The dam withholds a normal reservoir of 58000000000NaN0 with a drainage area of 1164000NaN0 and normal surface area of 1010NaN0. The dam has four different ways to discharge water downstream. First, the dam's spillways which contain 7 x floodgates at the crest and two flood tunnels can discharge 62600NaN0 and 74000NaN0 respectively. The dam also contains 6 x middle outlets and 4 x bottom outlets that can discharge 69300NaN0 and 20840NaN0 respectively. The dam's power station is located underground along with its transformer room which is in a separate cavern. Additionally, the power station is supported by an underground surge chamber as well.[3]
Source:
| Project Location | On the Yalong River, Sichuan province, P. R. China | |
| Project Purpose | Hydroelectric Power Generation | |
| Years of Construction | 1987-1999 | |
| Construction of Main Dam | ||
| Type | Double-curvature Arch Dam | |
| Height | 240 m | |
| Crest Length | 774.69 m | |
| Construction of Power plant | ||
| Maximum gross head | 189 m | |
| Installed Capacity | 6×550 MW (Francis) | |
| Power Conduits | 6 steel embedded in concreteI.D.=9.0 m | |
| Catchment and Reservoir | ||
| Catchment Area | 116,400 km2 | |
| Mean Annual Runoff | 1,670 m3/s | |
| Reservoir Area at FSL | 101 km2 | |
| Storage at FSL | 5,800 million m3 | |
| Active Storage | 3,370 million m3 | |
| Discharge Capacity | ||
| Crest Outlet | 7 / 6,260 m3/s | |
| Mid Level Outlet | 6 / 6,930 m3/s | |
| Bottom Outlet | 4 / 2,084 m3/s | |
| Flood Discharging | 2 / 7,400 m3/s | |
| Project Developers | ||
| Owner | Ertan Hydropower Development Company, Ltd. | |
| Designer | CHIDI, now POWERCHINA Chengdu | |
| Contractor | EJV, SGEJV, GYBD | |
| Main Equipment Suppliers | ||
| Turbines | GE Canada, Dongfang Electrical Machinery Co, Ltd., Harbin Electric Machinery Co, Ltd. | |
| Generators & HV Electrical | GE Canada, Dongfang Electrical Machinery Co, Ltd., Harbin Electric Machinery Co, Ltd. | |
| Gates & Hydromechanical | Jiajiang Hydraulic Machinery Works, China Gezhouba (Group) Corporation, Sinohydro Bureau No.8, |