Ikhuwa Khola

Details Topographical Survey

Project Location

Province : Koshi
District : Sankhuwasabha
Intake Site : Makalu Rural Municipality
Powerhouse Site :
Geographical Co-ordinates
Latitude : 27°37’45”N to 27°36’40”N
Longitude : 87°28’45”E to 87°27′ 07”E
Conservation Area (if appplicable)

General

Name of River : Ikhuwa Khola
Nearest Town : Num
Type of Scheme : Run Of River
Gross Head : 564 m
Net rated Head : 545.16
Installed Capacity : 9.732 MW
Average Annual Energy after Outage : 57.76 GWh
Dry Season -Energy : 17.8
Wet Season Energy : 39.960 GWh

Hydrology

Catchment Area : 56.8 km2
Mean Annual Discharge : 2.5 m3/s
Design Discharge (at 45%PoE) : 2.97 m3/s
Riparian Release : 0.032 m3/s
Design Flood Discharge : 298.24 m3/s
Average Annual Precipitation : 2645.20 mm

Diversion Weir/Dam for pondage

Type of Weir : Ogee Shaped Weir
Length of Weir : 23.00 m
Crest Elevation : 2710 m amsl
Undersluice Opening (W X H) : 3.5 m x 3.5 m (W x H)

Intake Structure cum Gravel Trap

Type of Intake : Side Intake
Nos of Opening : 2
Size of Intake (W x H) : 1.6 m x 0.5 m
Intake Sill Level : 2712 m amsl
Length of Gravel Trap : 4.0 m
Width of Gravel Trap (Avg.) : 4.2 m
Overall depth : 7.5 m
Particle size to be trapped : >5mm
Flushing Channel : 12 m

Approach Canal

Type : Open Rectangular
No. of canal : 1
Length : 25 m
Size (W x B) : 4.0 x 2 m

Desanding Basin

Type : Surface, Intermittent Flushing
Dimension (L x B x H) : 55 m x 5m x 5.2 m
Inlet Transition Length : 2.2 m
Particle Size to be settled : 0.2 mm
Trapping Efficiency : 87 %

Headrace Pipe/Tunnel

Type : Steel pipe
Internal Diameter : 0.8 m
Length : 2705.56 m
Steel Thickness/Type of Lining : 10 mm 9 Surge Tank/Forebay
Type : Steel pipe
Diameter (Or size) : 1.5 m

Steel Penstock Pipe

Type : Steel pipe
Internal Diameter : 0.8 m
Length : 692.0 m
Steel Thickness : 1
2 mm to 16 mm

Powerhouse

Type : Surface
Size (L x W) : 34.00 m x 12.00 m
Height : 12.00 m
Turbine Axis Level : 2110.0 amsl

Tailrace

Type : Open canal
Tailrace Length : 18 m
Size (W x D) : 0.5 x 0.5 m
Tailrace Water Level :

Turbine

Type : Pelton
Number : 2
Rated Output Capacity per unit : 4866 KW
Net Head : 545.16m
Discharge per Unit : 1.4m3/s
Efficiency : 90 %
14 Generator
Type : Brushless synchronous
Rated Capacity per Unit : 4500 kVA
Power Factor : 0.85
Generation Voltage : 6.6 kV
Frequency : 50 Hz
No of Units : 2
Efficiency : 97 %

15 Transformer

Type : Three-phase, oil immersed outdoor
Rated Capacity : 5 MVA
Voltage Ratio : 6.6/33
No of Units : 2
Vector Group : DYn-11
Frequency : 50 Hz
Efficiency : 99%

16 Transmission Line

Voltage Level : 33 KV
Number Circuit : Single Circuit
Length : 18 km
Conductor Type : DOG
From : Powerhouse
To : Arun 33 KV Transmission Line S/