a.

Name of the Project

:

Dana Khola Hydropower Project

b.

Name of the River

:

Dana, Prabe and Chyojyo Khola

c.

Type of Scheme

:

Run-of-river (RoR)

d.

Project Location

:

Nashong Rural Municipality, Manang

e.

License Boundary Coordinates

:

Latitude- 28⁰ 30′ 00” N to 28⁰ 31′ 18” N

Longitude- 84⁰ 21′ 39” E to 84⁰ 24′ 20” E

f.

Nearest Settlement

:

Nache Village

g.

Access Road Name

:

Access road Khotro-Dharmashala

a.

Developer

:

Lalupate Hydropower Company Pvt. Ltd.

b.

Consultant

:

Clean Energy Consultants Pvt. Ltd.

a.

Catchment Area at Intake

:

122.86 Km²

Catchment Area at Dana Intake Site (sq. km)

:

116.02 Km²

Catchment Area at Prabe Intake (sq. km)

:

4.80 Km²

Catchment Area at Chyojyo Intake (sq. km)

:

2.04 Km²

b.

Catchment Area at Powerhouse Site (sq.km)

:

2265.90 Km²

c.

Design Discharge

:

6.03 m³/s

Design Discharge at Dana Intake (m³/s)

:

5.71 m³/s at Q43.7%

Design Discharge at Prabe Intake (m³/s)

:

0.22 m³/s at Q40%

Design Discharge at Chyojyo Intake (m³/s)

:

0.10 m³/s at Q40%

d.

Average Annual Discharge (m³/s)

:

10.68 m³/s

Average Annual Discharge at Dana Intake

:

10.23 m³/s

Average Annual Discharge at Prabe Intake

:

0.31 m³/s

Average Annual Discharge at Chyojyo Intake

:

0.14 m³/s

e.

Minimum Monthly Discharge (m³/s) at Dana

:

2.48 m³/s

f.

Maximum Monthly Discharge (m³/s) at Dana

:

27.58 m³/s

g.

Minimum Environmental Release (m³/s)

:

0.26 m³/s

h.

Flood Discharge for Dana Headworks Design (100 years)

:

366.6 m³/s

i.

Flood Discharge for Prabe Headworks Design (100 years)

:

26.2 m³/s

j.

Flood Discharge for Chyojyo Headworks Design (100 years)

:

11.1 m³/s

k.

Flood Discharge for Powerhouse/Tailrace Design (100 years)

:

3444.4 m³/s

l.

Construction Flood Discharge for Dana Headworks (20 years)

:

34.2 m³/s

m.

Construction Flood Discharge for Powerhouse/Tailrace (20 years)

:

418.9 m³/s

a.

Average Annual Sediment Yield (ppm)

:

273.1 ppm

b.

Design Suspended Sediment Load (ppm)

:

5000 ppm

c.

Estimated Annual Sediment Yield (Million Ton/Yr)

:

0.324 million ton/yr

a.

Regional Geology

:

Higher Himalayan Sequence

b.

Major Rock Types in Headworks

:

Gneiss

c.

Major Rock Types in Waterways

:

Quartzite gneiss, Schistose Gneiss, Banded Gneiss, Cal-gneiss, Massive bedded Marble

d.

Major Rock Types in Powerhouse

:

Quartzite, Gneiss and Banded Gneiss

a.

Dam/Weir

:

Boulder Lined Weir

b.

Crest Level (masl)

:

2821.50 masl

c.

Type

:

Diversion weir with side intake

d.

Length (m)

:

16.11 m

e.

Lowest River Bed Level at Weir Axis (masl)

:

2817.77 masl

f.

Foundation Type

:

Alluvium and boulders

g.

Provision of Stilling Basin

:

N/A

a.

Intake Type

:

Side Intake with trashrack

b.

Number of Orifice

:

2 nos.

c.

Size (B x H, m)

:

3.00 x 1.80 m

d.

Top Sill Level (masl)

:

2821.31 masl

e.

Invert Sill Level (masl)

:

2819.50 masl

f.

Gate Type

:

Vertical sliding

g.

Hoisting System

:

Motorized gear hoist

h.

Trashrack Dimension and Opening (L x B, m)

:

2 nos. 3.0 m X 2.3 m

i.

Clear Opening of Trashrack (mm)

:

100 mm

j.

Trashrack cleaning mechanism

:

Manual

a.

Number of Bays

:

1 no.

b.

Dimension (L x B, m)

:

2.50 m x 3.00 m

c.

Undersluice Invert Level (masl)

:

2816.25 masl

d.

Gate Type

:

Vertical Sliding

e.

Hoisting System

:

Motorized gear hoist

a.

Type

:

Underground

b.

Settling Criteria

:

Upto 20 mm size

c.

Number of Basin

:

1 no.

d.

Gravel Trap Size (L x B x H, m)

:

40.5 m x 4.00 m x 3.50 m

e.

Size of Flushing Tunnel (B x H, m)

:

3.00 m x 3.00 m

a.

Type

:

Underground Dufour double bay  

b.

Settling Criteria

:

Upto 0.15 mm size

c.

Size of Particle to Settle (mm)

:

0.15 mm

d.

Settling Design Temperature (ᵒC)

:

15ᵒC

e.

Trapping Efficiency (mm)

:

90% (minimum)

f.

Number of Bays

:

2 nos.

g.

Inlet Transition Length (m)

:

12.5 m

h.

Settling Basin Size (L x B, m)

:

100.00 m x 7.00 m x 12.30 m

i.

Flushing System

:

Sand Flushing Tunnel

j.

Size of Flushing Channel (B x H)

:

3.00 m x 2.90 m

k.

Longitudinal Slope (V:H)

:

1:50

l.

Support Type (if underground)

:

Rock bolts and shotcrete as per requirement

a.

Prabe Khola

:

Collection from Adit 1

b.

Chyojyo Khola

:

Collection from Adit 2

a.

Type

:

Inverted D-shaped Tunnel

b.

Length (m)

:

3312 m

c.

Finished Dimension/Diameter (m)

:

3.00 m x 3.00 m shotcrete lined, and 2.6 m X 2.6 m concrete lined

d.

Inlet Invert Level (masl)

:

2818.294 masl

e.

Outlet Invert Level (masl)

:

2794.33 masl

f.

Support Type (if underground)

:

Rock bolts, shotcrete, and concrete lining as per requirement

a.

Adit 1 (Prabe Collection) including access tunnel to diversion tunnel and access to headrace tunnel from desander access tunnel

:

960 m

b.

Adit 2 (Chyojyo Collection)

:

463.37 m

c.

Adit 3 (Surge Tunnel)

:

579.27 m

d.

Adit 4

:

385.67 m

e.

Adit 5

:

455.18 m

f.

Adit 6 (Main Access Tunnel)

:

442.22 m

a.

Type

:

Surge Tunnel D-shaped, Concrete Lined

b.

Length (m) & Dia. (m)

:

591 m, 3.00 m Dia.

c.

Upsurge Level (masl)

:

2825.45 masl

d.

Downsurge Level (masl)

:

2816.45 masl

a.

Material

:

Mild steel welded pipe lining, E450

b.

Length (m)

:

1624.14 m

c.

Internal Diameter (m)

:

1.7 m

d.

Thickness (mm)

:

10-66 mm

e.

Number of Anchor Blocks

:

6 nos.

f.

Number of Saddle Supports

:

N/A

h.

Support Type (if underground)

:

Rock bolts and shotcrete as primary rock support and Concrete fill in between pipe and rock

a.

Type

:

Underground with Indoor GIS Switchyard

b.

Plan Dimensions (L x B x H, m)

:

51.50 m x 14.00 m x 23.67 m

c.

Machine Floor Level (masl)

:

1833.38 masl

d.

Overhead Hoisting Type

:

Overhead Travelling Crane

e.

Overhead Hoisting Capacity (Metric Tons)

:

50 ton

f.

Foundation Type

:

Rock foundation

g.

Support Type (if underground)

:

Rock bolts and shotcrete as per requirement

a.

Type

:

Free-flow Tunnel

b.

Numbers

:

1 no.

c.

Size (B x H, m)

:

3.00 m x 3.00 m

d.

Length (m)

:

415.00 m

e.

Outlet Water Level at River

:

1785 masl

f.

Maximum Allowed Tail Water Level (masl)

:

1822.00 masl

h.

Invert Level of Tailrace at Outlet (masl)

:

1819.60 masl

i.

Support Type

:

Rock bolts and shotcrete as per requirement

a.

Type

:

Vertical axis Pelton

b.

Number of Unit

:

3 nos.

c.

Maximum Head (m)

:

995.25 m

d.

Minimum Head (m)

:

988.27 m

e.

Rated Net Head (m)

:

988.27 m

f.

Rated Capacity per Unit (Kilowatts)

:

18000 kW

g.

Discharge per Unit (m³/s)

:

2.01 m³/s

h.

Turbine Axis Elevation (masl)

:

1825 masl

i.

Turbine Efficiency (%)

:

90%

a.

Type of Generators

:

3-Phase AC synchronous

b.

Number of Unit

:

3 nos.

c.

Rated Output (kVA)

:

19.588 MVA+10% COL

d.

Generation Voltage (kV)

:

11 kV

e.

Frequency (Hz)

:

50 Hz

f.

Excitation System

:

Brushless excitation

g.

Speed (rpm)

:

600 rpm

h.

Generator Efficiency (%)

:

96%

a.

Type

:

Outdoor Step-up Power Transformer, single phase

b.

Number of Phase

:

6+(1 spare)

c.

Number of Units

:

6 nos., 2 Banks

d.

Rated Output (MVA)

:

11 MVA

e.

Frequency (Hz)

:

50 Hz

f.

Vector Group

:

YNd11

g.

Voltage Ratio

:

220/11 kV

h.

Transformer Efficiency

:

99%

a.

Dimensions

:

50.00 m x 12.50 m

a.

Transmission Voltage (kV)

:

220 kV

b.

Length (km)

:

5.5 km

c.

Connection Point (Location)

:

220/132/33 kV Dharapani Substation

d.

Number of Poles/Towers

:

13 nos.

a.

Installed Capacity (Kilowatts)

:

49950 kW

b.

Gross Head (m)

:

996.50 m

c.

Dry Season Energy (GWh)

:

92.485 GWh as per PPA

108.47 GWh as per UFSR

d.

Wet Season Energy (GWh)

:

208.387 GWh as per PPA

211.62 GWh as per UFSR

e.

Total Deemed Annual Energy (GWh)

:

300.872 GWh as per PPA

320.10 GWh as per UFSR

a.

Government Land Requirement (Ha)

:

4.8 Ha