| Koteshwar Dam | |
| Location Map: | India Uttarakhand |
| Coordinates: | 30.2603°N 78.4981°W |
| Country: | India |
| Location: | New Tehri |
| Opening: | 2011 |
| Owner: | Tehri Hydro Development Corporation |
| Dam Type: | Gravity |
| Dam Height: | 97.50NaN0 |
| Dam Length: | 3000NaN0 |
| Dam Volume: | 5600000NaN0 |
| Dam Elevation Crest: | 618.50NaN0 |
| Spillway Type: | Service, 4 x radial gate controlled |
| Spillway Capacity: | 132400NaN0 |
| Res Capacity Total: | 889000000NaN0 |
| Res Capacity Active: | 350000000NaN0 |
| Res Catchment: | 76910NaN0 |
| Res Surface: | 290NaN0[1] |
| Res Elevation: | 612.50NaN0 (full) |
| Plant Hydraulic Head: | 750NaN0 (max) |
| Plant Commission: | 2011-2012 |
| Plant Turbines: | 4 x 100 MW Francis-type[2] |
| Plant Capacity: | 400 MW |
The Koteshwar Dam is a gravity dam on the Bhagirathi River, located 220NaN0 downstream of the Tehri Dam in Tehri District, Uttarakhand, India. The dam is part of the Tehri Hydropower Complex and serves to regulate the Tehri Dam's tailrace for irrigation and create the lower reservoir of the Tehri Pumped Storage Power Station. In addition, the dam has a 400 MW (4x100 MW) run-of-the-river power station.[3] The project was approved in 2000 and its first generator was commissioned on 27 March 2011, the second on 30 March 2011. The construction site had been inundated in September 2010 by floods. The diversion tunnel was later blocked heaving/collapse of the hill in December 2010. The spillway was commissioned in Jan, 2011.[4] The last two generators were made operational in March 2012.[5]
The dam is 97.50NaN0 tall and 3000NaN0 long. It has a structural volume of 5600000NaN0 and its crest lies at an elevation of 618.50NaN0 above sea level. The dam's spillway consists of four 180NaN0 wide and 160NaN0 tall radial gates. When the reservoir is at flood level, the spillway has a discharge capacity of 132400NaN0. Receiving water from Tehri Dam and collecting it from an overall 76910NaN0 catchment area, the dam creates a reservoir with a 889000000NaN0 capacity, of which 350000000NaN0 is active (or "useful"). The reservoir's surface area is 290NaN0 and at full pool, it lies at an elevation of 612.50NaN0. The dam's power station is a run-of-the-river type and uses the active storage in the reservoir which can draw the lake down 300NaN0 from full pool. The power house is located on the right bank of the river below the dam and contains 4 x 100 MW Francis turbine-generators. The height of the dam allows for a maximum 750NaN0 of hydraulic head.[1] [2]