Project Location

Development Region	Central Development Region
Zone	Sagarmatha
District	Solukhumbu
Intake Site	Chheskam
Powerhouse Site	Bun and Gudel

Geographical Co-ordinates

Latitude	27 0 32'08"N-27 0 30'51"N
Longitude	86 0 51'23"E- 86 0 53'54"E

General

Name of River	Hongu Khola
Nearest Town	Salleri Bazaar
Type of Scheme	Run-of-River
Gross Head	210.00 m
Net rated Head	Net rated Head
Installed Capacity	22,000.00 kW
Average Annual Energy after Outage	137.89 GWh

Hydrology

Catchment Area	372 km 2
Mean Annual Discharge	22.49 m 3 /s
Design Discharge (Q42.85)	13.00 m 3 /s
Riparian Release	0.555 m 3 /s
Design Flood Discharge	424.0 m 3 /s (100 years flood)
Average Annual Precipitation	1914.9 mm

Diversion Weir

Type of Weir	Gravity free flow with spill way
Length of Weir	36.5 m
Crest Elevation	Crest Elevation
Crest Elevation	Sloping with free overflow
Undersluice Opening (W X H)	3.5 m x 3.0 m
Undersluice Crest Level	1594.4 masl

Intake, Trash PassageStructure cum Gravel Trap

Type of Intake	Side Intake with Orifice3
Nos of Opening	3
Size of Intake (W x H)	2.8 m x 2.5 m
Size of Trash Passage (W x H)	1.5 m x 1.5 m
Intake Sill Level	1597.80 m
Length of Gravel Trap	12 m
Width of Gravel Trap (Avg.)	10.4 m
Overall depth	5.5 m
Particle size to be trapped	2-200 mm
Flushing Channel	L = 42 m, W = (1.2 m – 1.3 m), H = 1.2 m

Intake, Trash PassageStructure cum Gravel Trap

Type of Intake	Side Intake with Orifice3
Nos of Opening	3
Size of Intake (W x H)	2.8 m x 2.5 m
Size of Trash Passage (W x H)	1.5 m x 1.5 m
Intake Sill Level	1597.80 m
Length of Gravel Trap	12 m
Width of Gravel Trap (Avg.)	10.4 m
Overall depth	5.5 m
Particle size to be trapped	2-200 mm
Flushing Channel	L = 42 m, W = (1.2 m – 1.3 m), H = 1.2 m

Approach Canal

Type	Surface , 4 bays
Overall Dimension (L x B x H)	55 m X 20.8 m X (4.0-6.8) m
Inlet Transition Length	16.4 m
Particle Size to be settled	Greater than and upto 0.2 mm
Trapping Efficiency	98 %

Headrace Pipe

Type	Mild Steel
Internal Diameter	2.5 m
Length	157.00 m
Steel Thickness	10 mm
Nos. of Anchor Blocks	3 Nos.

Headrace Tunnel

Type	Tunnel
Finishing Diameter	3.5 m x 3.8 (Inverted D-Shaped)
Length	3946.10 m

Surge Shaft

Type	Circular, Underground Shaft
Effective Depth	33.5 m
Diameter (Or size)	8 m.
Up Surge Level	1610.93 masl
Down Surge Level	1588.96 masl
Normal Operation Level	1596.48 masl

Vertical Shaft

Type	Mild Steel Pipe
Internal Diameter	2.2 m
Total Vertical Shaft Length	127.5 m
Steel Thickness	14 mm to 18 mm
Tunnel Enclosing Vertical Shaft	3.2 x 3.2 m

Penstock Tunnel

Type	Tunnel
Finished Diameter	3.5 m x 3.8 m (Inverted D-Shaped)
Length	481.71 m

Powerhouse

Type	Underground
Size (L x W)	40 m X 11 m
Height (H)	25 m

Tailrace tunnel/canal

Type	Tunnel
Tailrace Length	112 m
Finished Size (W x D)	3.5 m x 3.8 m (Inverted D- shape)
Normal Tailrace Water Level	1391.00 masl

Turbine

Type	Vertical Axis Francis Turbine
Number	3 (Three)
Rated Output Capacity per unit	7.85 MW
Net Head	202.061 m
Discharge per Unit	4.35 m 3 /s
Efficiency	90.0 %

Governor

Type	Electronic Digital /Hydraulic
Adjustment for Speed Drop	Between 0 to 5%

Generator

Type	Vertical Axis Francis Turbine
Number	Synchronous with Brushless excitation System
Rated Output Capacity per unit	8.9 MVA
Power Factor	0.85
Voltage	11 kV
Frequency	50 Hz
No of Units	3 (Three)
Excitation System	Brushless
Efficiency	96.0 %

Transformer

Type	Single Phase, Oil Immersed, Indoor
Rated Capacity	8.9 MVA
Voltage Ratio	132/11 KVA
No of Units	3 (Three) + 1
Vector Group	YNd11
Efficiency	99.0 %

Transmission Line

Voltage Level	132 kV
Length	25 km (approx.)
Conductor Type	ACSR “Wolf”
From	Powerhouse
To	Tingla Substation, Solukhumbu

Access Road

Intake site	10km from Sotang
Powerhouse site	3km from Phulpati Khola

Construction period	32 month

IRR	15.20 %

EIRR/ROE	22.79%

Total Project Cost	NPR4,364,800,000 (With IDC)

BC Ratio	1.38