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| TEHRI DAM & HPP(STAGE-I) |
| Features |
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| SALIENT FEATURES |
Nature of Scheme: | Storage scheme | Hydrology | Normal Annual Rainfall | 1016 to 2630 mm. | Maximum recorded flood discharge | 3800 Cumecs | Adopted maximum flood for diversion during monsoon period | 8120 Cumecs | Probable maximum flood | 15540 Cumecs | Routed Flood | 13248 Cumecs | Reservoir | Full Reservoir Level (FRL) | EL 830 m. | Maximum Level during design flood (MFL) | EL 835 m | Dead Storage Level | EL 740 m. | Gross Storage | 3540 MCM | Dead Storage | 925 MCM | Live Storage | 2615 MCM | Water Spread at full Supply Level EL.830 m. | 42 Sq.km. | Water Spread at dead Storage Level EL.740 m. | 18 Sq.km. |
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| TECHNICAL FEATURES |
Diversion Tunnels | Type | Horse shoe | Left Bank | 2 Nos. 11.0m dia, 1774 &1778 m long | Right Bank | 2 Nos. 11.0m dia, 1298 &1429 m long | Diversion Flood Discharge | 8120 Cumecs | Dam | Type | Earth and Rock fill dam | Top Level | EL 839.5 m | Height | 260.5 m | Width at riverbed | 1125 m | Width at top | 25.5 m flared to 30.5 m at abutments | Length at Top | 592m | Slope | Upstream | 1: 2.5 | Downstream | 1: 2 | Spillways | Chute Spillway: | | Crest Level | EL 815.0 m | Waterway | 3 bays of 10.5 m width | Design Discharge | 5500 Cumecs | Type & No. of Gates | Radial Gates, 3 Nos | Right Bank Shaft Spillway: | | Type | Ungated 2 Nos | Crest Level | EL 830.2 m | Dia of Shaft | 12.0 m | Design Discharge | 3850 Cumecs | Left Bank Shaft Spillway: | | Type | Gated 2 Nos | Crest Level | EL 815.0 m | Dia of Shaft | 12.0 m | Design Discharge | 3650 Cumecs | Type of Gates | Radial gates | Intermediate Level Outlet: | | No. and size | One; 8.5 m dia | Discharge capacity ( at EL. 830.0 m) | 1100 Cumecs | Intake Works: | | Location | Left Bank of river Bhagirathi | No & Type of Structure | 2 Nos. Submerged Structure | Crest Elevation | EL 720 m. | Head Race Tunnels: | | Size and Number | 8.5m. dia, 2 Nos, | Total Length | 1634 m | Penstocks: | | Number and Size | 4 Nos., 5.75 m. dia each | Total Length | 1040 m | Power House | Machine Hall: | | Type | Underground | Location | Left Bank, under ground | Number & Units | 4 Nos, 250 MW each | Size | 197 m long, 22.0 m wide, 47.2m. high | Head | Maximum 231.5 m ,
Minimum 127.50 m ,
Design 188.0 m. | Transformer Hall: | | Type | Underground | Size | 161m.long X 18.5m.wide X 29.0m high | Step-up Transformers: | | Capacity | 306 MVA | Number | 4 | Voltage Ratio | 15.7/400 KV | Switchyard: | | Location and Type | Indoor SF-6 Switchgear | Tail Race Works: | | Number and size of tail race tunnels | 2 Nos. , 9.0 m. dia each | Length of Tunnels | 862.5 m & 747.5 m | Invert Level of Outlet | EL. 598.0 m. | Installed Capacity : | 1000 MW (4x250 MW) |
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