Dagmara Hydroelectric  Project

 

                        SALIENT FEATURES             

 

1.0

LOCATION

 

 

Country

India

 

State

Bihar

 

District

Supaul

 

Sub Division

Supaul

 

Block

Bhaptiahi

 

River

Kosi

 

Project Area

 

 

Eastern Embankment

Latitude: 260 18’ 50.4” N

Longitude: 860 45’ 32.4” E

 

Western Embankment

Latitude: 260 21’ 25.2” N

Longitude: 860 42’ 3.6” E

 

Access to the Project

Supaul-Bhaptiahi Road (SH) on left bank Nirmali-Kunauli embankment road on right bank and NH-57

 

Nearest Village

Old Bhaptiahi on left Bank

 

Airport

Patna-250 km

 

Nearest Rail Head

Raghopur-3 km on left bank

Nirmali-15 km on right bank

 

Port

Kolkata

2.0

SCHEME

 

 

Type

Run-off-the River

 

Installed Capacity

17 x 7.65 MW (130 MW)

3.0

HYDROLOGY

 

 

Catchment Area

61, 972 sq. km.

 

Maximum Annual Rainfall

2191 mm

 

Minimum Annual Rainfall

1291 mm

 

Maximum Intensity (1 Day) at Birpur

318.5 mm

 

Maximum Design Flood

27000 cumec

 

Annual Average Sediment Load (1973-81)

650 m3/M Sq m/year

4.0

POWER POTENTIAL

 

 

Pond Level

RL 65.50 m

 

MDDL

RL 64.5 m

 

Gross Head

5.87 m

 

Net Head

5.28 m

 

Discharge available for power generation

2739 m3/sec

 

Installed Capacity

17 x 7.65 MW

 

Annual Energy Generation

366.83 MU

5.0

DIVERSION STRUCTURE

 

 

Type of Diversion Structure

Barrage

6.0

POWER HOUSE

 

 

Type

Surface Type

 

Service Bay

2 nos. (20 m width on each side)

 

Total length of Power House including service bay

283.20 m

 

Centre to centre spacing of each unit

12.5 m

 

Turbine Centre Line Level

EL 52.95 m

 

Machine Hall Level

EL 60.82 m

 

Service Bay Level

EL 67.50 m

 

Design Discharge per unit

105.30 m

7.0

TYPE OF TURBINE

 

 

Type

Pit Type Bulb

 

Rated Discharge

105.30 cumecs

 

Number

17

 

Capacity

5400 KW

8.0

GENERATOR

 

 

Type

Synchronous

 

Capacity

5550 KVA each

 

Number

17

 

Power Factor

0.9

 

Frequency

50 Hz

 

Number of Phases

3

 

Voltage

11 KV

9.0

STEP UP TRANSFORMER

 

 

Type

Outdoor type (ONAN/ONAF)

 

Quantity

6

 

Capacity

40/50 MVA, 3-Phase

 

Voltage Ratio

11/132 KV

10.0

TIME OF COMPLETION

60 Months including 6 Months of Pre-Construction Period

11.0

TAIL POOL AND DRAFT TUBE GATE

 

 

Width and Length of Tail Pool

246.10 m x 34.45 km

 

No of Draft tube Gates Provided

17 nos.

 

No. of Draft Gate Openings

17

 

Size of Draft Tube Gate

6 m (H) x 12.0 m (L)

 

Sill Level of DT Gate

EL49.95 m

 

Design Discharge per unit

105.30 cumecs

 

Bottom of Draft Tube

E1 49.95 m

 

Max TWL/Flood Level

EL 61.34 m

 

Normal TWL

EL 59.30 m

12.0

INTAKE CHANNEL

 

 

Width of Intake channel

246.10 m

 

Length of Intake channel

89.5 m

 

Design Discharge per unit in the channel

105.30 cumec

 

No of intake gates

17 nos

 

Size of Intake gates

12.00 x 7.00 m

 

Sill Level of Intake Gate

EL 56.5 m

 

Intake Level – a) Overt

                            b) Invert

 

EL 58.57 m

EL 47.95 m

 

13.0

SWITCHYARD

 

 

Type

Open

 

Size

65.0 m x 85.0 m

 

Location

On the Left Bank side

14.0

TRANSFORMER LINE

 

 

Voltage for Transmission line

132 KVA

 

Length of Transmission Line

4 Kms LILO

 

Name of Substation where power is finally dispatched

Tapping on Supaul-Kataiya 132 kV Double Circuit Line (Under construction)

15.0

BARRAGE

 

 

Length

998.50 m

 

Type

R.C.C Raft with piers & gates

 

Top Elevation of Pier

EL 67.0 m

 

Crest Elevation for Spillway bays

EL 58.10 m

 

Crest Elevation for under sluice bys

EL 57.0 m

 

Total Length of concrete floor in under sluice

86.90 m

 

Total Length of Concrete Floor in Spillway

82.90 m

 

Length of downstream concrete floor in spillway bays

71.00 m

 

Length of each span between piers

18.0 m

 

No of spans in Spillway

40

 

No of Span in under sluice

8 + 2 nos. for bypass gates + 1 fish ladder

 

Thickness of upstream floor

1.50 m

 

Thickness of downstream floor

3.0 m (Average)

 

Thickness of pier

2.5 m

 

Height of Barrage gates

7.4 m in spillway and 8.5 m in under sluice

 

Design Discharge of spillway and under sluice bays

27000 cumecs

 

Energy Dissipater

Hydraulic jump type Stilling Basin

 

16.0

DIVERSION ARRANGEMENT

 

 

Type

Diversion Channel and Coffer Dam

 

Diversion Capacity

3160 cumecs

 

Diversion Flood

1 in 25 Yrs Flood

 

Coffer Dam type

Earthen with clay blanket on upstream side

 

Height of Coffer Dam

3.5 m

17.0

BARRAGE POND

 

 

Full Pond Level (FLR)

EL 65.5 m

 

Min Draw Down Level (MDDL)

EL 64.5 m

 

Gross Storage

120 MCM

 

Live Storage between MDDL and FLR

29.7 MCM

 

Area under submergence at FLR

7500 ha

18.0

COST OF PROJECT

 

 

Cost of Project

 

 

Cost of Civil Works

 

 

Cost of E & M Works

 

19.0

LEVELLISED TARIFF

 

 

First Year Tariff

 

 

Levellised Tariff

 

 

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