| Xinfengjiang Dam | |
| Location Map: | China |
| Coordinates: | 23.7272°N 114.6492°W |
| Country: | China |
| Location: | Heyuan City |
| Construction Began: | 1958 |
| Opening: | 1962 |
| Dam Height: | 1050NaN0 |
| Dam Length: | 4400NaN0 |
| Dam Width Crest: | 50NaN0 |
| Dam Volume: | 10600000NaN0 |
| Dam Crosses: | Xinfeng River |
| Spillway Count: | 2 |
| Spillway Type: | Service, surface gate-controlled overflow Auxiliary tunnel |
| Spillway Capacity: | Service: 114000NaN0 Tunnel: 17000NaN0 |
| Res Name: | Xinfengjiang Reservoir |
| Res Capacity Total: | 13900000000m2 |
| Res Capacity Active: | 57400NaN0 |
| Res Surface: | 3700NaN0[1] |
| Plant Hydraulic Head: | 810NaN0 (max.) |
| Plant Commission: | 1960-1977 |
| Plant Turbines: | 3 x 72.5 MW 1 x 75 MW Francis-type |
| Plant Capacity: | 292.5 MW 315 MW (max. planned) |
The Xinfengjiang Dam (also known as the Xinfeng Dam) is a gravity dam on the Xinfeng River, 80NaN0 upstream of its confluence with the Dong River, and just west of Heyuan City in Guangdong Province, China. The dam's power station has a 292.5 MW installed capacity and its reservoir supplies water for farming along with drinking water to Guangzhou, Shenzhen and Hong Kong. Construction on the dam began in 1958, the first generator was operational in 1960 and the dam complete in 1962. The dam's reservoir-filling is attributed to several earthquakes within the project area including a 6.1-magnitude (Mw) on March 19, 1962.
Construction on the dam began in 1958, a total of 15500000NaN0 of earth was excavated at the construction site. On October 20, 1959 the reservoir behind the dam began to fill and in November there were several small earthquakes within the reservoir zone. When the water level reached 810NaN0 above sea level (ASL) in May 1960, there were three to four earthquakes at a 3.1- and on July 18, when the water level 900NaN0 ASL, a 4.3- earthquake occurred. On March 19, 1962 when the reservoir reached 110.50NaN0 ASL there was a 6.1- earthquake with an epicenter 1.10NaN0 downstream from the dam which destroyed several houses in the area.[2] [3] After the earthquake and as a precaution, cavities within the foundation were reinforced with concrete. This and other upgrades brought the dam to a 9.5--rated resistant design.[2]
The dam is a 1050NaN0 tall, 4400NaN0 wide gravity dam. Its crest width is 50NaN0 and it has a structural volume of 10600000NaN0 of concrete. Above the dam is a 57400NaN0 drainage area and it withholds a reservoir of 13900000000m2. The dam contains a surface controlled spillway with three floodgates, each with a 38000NaN0 maximum discharge capacity for a total of 114000NaN0. The discharge tunnel on the dam's left bank has a 100NaN0 diameter, is 7780NaN0 long and has a 17000NaN0 capacity. The dam's reservoir has a 3300000000m2 flood storage capacity, rated for a once in a hundred-year flood. The dam's power station is located at its base (toe) and contains four Francis turbine generators. Three are rated at 72.5 MW and the fourth at 75 MW for a total design capacity of 292.5 MW but the power plant can operate at a maximum 315 MW after later upgrades.[2] [4]