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LDHC Profile
Loktak Downstream Hydroelectric Corporation Limited is a joint venture company of NHPC Limited ( stake 74%) and State Government of Manipur (stake 26%) for implementation of Loktak Downstream Hydroelectric Project (66 MW) in Tamenglong district of Manipur to exploit the hydroelectric potential of tailrace discharge of Loktak Hydroelectric Project supplemented by Leimatak River. It is a subsidiary company of NHPC Limited.
PROJECT LOCATION:
Loktak Downstream Hydroelectric Project (66MW) is located on the river Leimatak in district Tamenglong of State of Manipur. Project areas come under the jurisdiction of Nungba sub-division.
SALIENT FEATURES
| LOCATION: | |||
| State | Manipur | ||
| District | Tamenglong | ||
| River | Liematak | ||
| Dam Site | Near Tousang village | ||
|
Dimapur | ||
| Nearest Airport | Imphal | ||
| Latitude | 24 | ° 43′ 52.61″ N | |
| Longitude | 93 | ° 35′ 7.62″ E | |
| HYDROLOGY: | ||
| Catchment Area | 546 Sq. Km | |
| Average Annual Rainfall | 1644 mm | |
|
167 Cumec | |
|
21 Cumec | |
| RESERVOIR: | |||||
|
EL 307.0 m | ||||
|
EL 305.0 m | ||||
|
300.6 Ham | ||||
|
67 Ham | ||||
| SPILLWAY: | |||||
| Type | Gated Ogee Type | ||||
| Design flood (SPF) | 3070 Cumec. | ||||
| Number of bays | Four Nos.(including one emergency) | ||||
| Crest of spillway | EL 292.0 m | ||||
|
10.5 m wide | ||||
| Energy dissipation | Stilling Basin with end sill | ||||
| INTAKE: | |||||
| Number and size | Two, 5.0m(W)x3.0m(H) | ||||
|
EL 298.0 m | ||||
| Trash Rack | Inclined Type | ||||
| STAGE DIVERSION: | ||
| Diversion Discharge | 1265 Cumec. | |
| Number of Stages | Two | |
| DAM | ||
| Type | Concrete Gravity Dam | |
| Dam Top elevation | EL 309.0 m | |
|
20.0 m | |
Height of Dam above Deepest
| Foundation Level | 30.0 m | |
|
162.9 m | |
SPILLWAY:
| Type | Gated Ogee Type | |
| Design flood (SPF) | 3070 Cumec | |
| Number of bays | Four Nos.(including one emergency) | |
| Crest of spillway | EL 292.0 m | |
|
10.5 m wide | |
| Energy dissipation | Stilling Basin with end sill | |
INTAKE:
| Number and size | Two, 5.0m(W)x3.0m(H) | ||
| Invert level at inlet | EL 298.0 m | ||
| Trash Rack | Inclined Type | ||
| HEAD RACE TUNNEL: | ||||||||
|
One | |||||||
|
5.0 m | |||||||
|
Horseshoe shaped | |||||||
|
5849 m | |||||||
|
55.46 Cumec | |||||||
|
Two No. & 5.6 m, D-shaped with | |||||||
| . | one Gated plug (3mx3m) | |||||||
| SURGE SHAFT: | ||||||||
| Number and Type | One, Restricted Orifice Type | |||||||
| Size (finished diameter) | 12.5 m | |||||||
| Shape | Circular | |||||||
|
61.0 | |||||||
| Top elevation | EL 335.0 m | |||||||
| PENSTOCK: | ||||||||
| Number | One bifurcating to two | |||||||
| Type | Steel lined | |||||||
| Shape | Circular | |||||||
| Diameter (Steel Lined) | 4.8 m bifurcating to 2.6 m | |||||||
| Length | (4.8 m dia.) | 722.0 m | ||||||
| Length | (2.6 m dia.) | 44.0 & 40.0 m | ||||||
|
6.0 m D – Shaped | |||||||
| SWITCH YARD: | ||||
| Size | 125 m (L) x 64 m (W) | |||
| POWER GENERATION: | ||||
| Installed capacity | 66 MW | |||
| Annual Energy generation in 90% | 334.22 MU | |||
| dependable year at 95% M/c availability | ||||
CRITICAL EVENTS/ STATUTARY CLEARANCES:
|
14.09.2007 |
|
10.9.2009
06.08.2012 |
|
26.08.2013 |
|
03.03.2011 |
|
16.01.2013 |
|
05.05.2017 |