1. Location

(i)   State

:

Bihar

(ii)  District

:

Madhepura

(iii) River

:

Arar Dhar -  an old source of Kosi River

1.1 Project Area

(i) Latitude

:

N 25⁰47’

(ii) Longitude

:

E 86⁰53’

(iii) Access to the project

:

Madhepura-Udakishanganj Road

(iv) Nearest Village

:

Arar Ghat

(v) Rail Head

:

Madhepura

(vi) Port

:

Kolkata

(vii) Airport

:

Patna – 280 km

2 Scheme Type

(i) Type

:

Run-of-the-River with peaking -24 hours during monsoon months and varying number of hours during rest of the months

(ii) Installed capacity

:

(4 X 3  MW) = 12 MW

3. Hydrology

(i) Maximum Annual Rainfall

:

2191 mm

(ii) Minimum Annual Rainfall

:

1291 mm

(iii) Maximum Intensity (one day) at Birpur

:

318.5 mm

4. Power Potential

(i) Gross Head

:

6m

(ii) Net Head

:

4.50m

(iii) Discharge available for power generation

:

300 m³/sec (During Monsoon)

150 m³/sec (During Non-Monsoon)

75 m³/sec (During Lean Season)

(iv) Installed Capacity

:

4 x 3 MW = 12 MW

(v) Annual Energy Generation

:

64.8 MW

5. Diversion Structure

(i) Type of Diversion Weir

:

Gated Barrage

(ii) Length of Barrage including spillway and under sluice bays

:

59.75m

(iii) No. of Gates

:

7 Nos.

(iv) Size of Gates

:

7.25 m (W) x 5.7 m (H)

(v) Type

:

Vertical lift

(vi) Thickness of each pier

:

1.50 m

6.  Power House

(i) Type

:

Surface, toe of the dam type

(ii) Size

:

50 m (L) x 28 m (W) x 22.50 m (H) above Generator Floor

(iii) Service Bay level

:

EL 95.00 m

(iv) Machine Hall Floor Level

:

EL 84.50 m

(v) Installed Capacity

:

(4x3 MW) = 12 MW

7.  Turbine

(i)  Type

:

Tubular / Bulb or Pit type

(ii)  Rated Discharge

:

75 m³/s

(iii) Number of Turbines

:

4

(iv) Capacity

:

3 MW each

(v) Rotational Speed

:

107 rpm

8. Generator

(i)  Type

:

Synchronous

(ii) Capacity

:

3.75 MVA

(iii) Number of units

:

4

(iv) Power Factor

:

0.8

(v) Frequency

:

50 Hz

(vi) Number of Phases

:

3

(vii) Voltage

:

3.3 kV or 6.6 kV

9.   Step up Transformer

(i)  Type

:

Outdoor type ONAN

(ii) Quantity

:

4

(ii) Capacity

:

3.75 MVA

(iii) Voltage Ratio

:

3.3 kV or 6.6 kV / 33 kV

10.  Speed Increasing Gearbox

(i) Speed on Turbine Side

:

107 rpm

(ii) Speed on Generator Side

:

750 rpm

11. Evacuation

(i) Nearest Sub-Station of BSEB

:

Uda-Kisunganj-Grid sub-station of BSEB is located approximately 10 KM from the powerhouse site

(ii) Voltage level

:

Power will be generated at 3.3 kV or 6.6 kV and stepped-up to 33 kV for evacuation

(iii) Transmission line

:

33 kV Double Circuit Transmission line laid on steel poles shall be constructed to evacuate the power from the switchyard of Arar Ghat power house upto Udakisunganj-Grid Sub-Station of BSEB