Panchpokhari Khola 9.03MW

Panchpokhari Khola

Details Topographical Survey

Location

Latitude 27°34’18’’N to 27°36’09” N
Longitude 87°25’08”E to 87°26’29” E
State (Province) Koshi
District Sankhuwasabha
Intake Site Makalu Rural Municipality
Powerhouse Site Confluence of Panch Pokhari Khola and Ikhuwa
Khola, Makalu Rural Municipality

General

Name of River Panch Pokhari Khola
Nearest Town Gadi Dada Bazaar
Type of Scheme Run-of-River
Gross Head 735.50 m
Net Head 705.82 m
Design Discharge 1.42 m3/s
Installed Capacity 8.58 MW
Net Dry Energy 15.91 GWh
Net Wet Energy 35.21 GWh
Net Total Energy 51.12 GWh

Hydrology

Catchment Area 28.92 km2
Average Annual Rainfall 2908 mm
Design Discharge 1.42 m3/s
Design Flood at Headworks 162.0 m3/s (1 in 100-year Flood)
Design Flood at Powerhouse 698.0 m3/s (1 in 100-year Flood) Saphal Hydropower Private Ltd Panch Pokhari Khola Hydropower Project
Feasibility Study Report ~ ii ~ January 2025

Weir

Type Gravity overflow Weir
Material Concrete
Length 13.5 m
Weir Height from river bed 4.0 m
Weir Crest Elevation 2342.00 m

Intake Structures

Type of Intake Orifice Side Intake
No. of Orifice 2
Size of each Orifice 1.50 m (w) X 1.00 m (h)
Invert Level of Intake 2340.00 m
Design Flow with Flushing Discharge (30% 0f Design Flow) 1.82 m3/s

Under sluice

No. of under sluice 1
Size (W X H) 1.5 m X 2.5 m
Invert Level El. 2338.00 m

Gravel Trap

Size ( L X B X H) 4.0m X 2.5m X 3.25m
No. of Bay 1
Particle size to be settled 5 mm and higher
Flushing System Continuous during monsoon
Gravel Flushing Culvert 0.5 m X 0.8 m
No. of Culverts 1
Length 9.2 m Saphal Hydropower Private Ltd Panch Pokhari Khola Hydropower Project
Feasibility Study Report ~ iii ~ January 2025

Approach canal

Type Free Flow
Shape Rectangular
Size 1.0m (w) X 2.0m (h)
Total Length 12.70 m

Settling Basin

Type Surface
Size of each bay (L X B X H) 32.0m X 4.0 m X 3.25m (Uniform section)
No. of Basin 2
Designed Particle 0.15mm and higher
Settling Basin Trap efficiency 90%
Flushing Type Intermittent
Hopper Bed Slope 1:50
Design Flow with Flushing Discharge (10% of design discharge)1.54 m3/s

Headrace Pipe

Type Mild Steel
Length 2454.0 m
Internal Diameter 0.9m
Thickness 8 mm

Surge Tank

Diameter 4.0m
Height 9.0m

Penstock Pipe

Type Mild Steel
Saphal Hydropower Private Ltd Panch Pokhari Khola Hydropower Project
Feasibility Study Report ~ iv ~ January 2025
Length 1661.0 m
Internal Diameter 0.7m
Thickness 8-30 mm

Powerhouse

Type Surface
Size ( L X B X H) 35.65 m X 17.65 m X 17.0 m

Tailrace

Type Surface
Size (B X H) 1.80 m X 1.05 m
Length 40.0 m
Tail Water Level 1603.50 m

Turbine

Turbine Type Pelton Turbine (horizontal)
No. of Units 2
Rated Output Capacity per Unit 4.36 MW
Discharge per unit 0.71 m3/s
Turbine Efficiency 90%
Turbine Axis Level 1606.50m

Generator

Generator Type Synchronous, Salient Pole
Rated Output Capacity per Unit 4.98 MVA
Power Factor 0.85
Voltage 6.6 KV
Frequency 50 Hz
No. of Units 2
Saphal Hydropower Private Ltd Panch Pokhari Khola Hydropower Project
Feasibility Study Report ~ v ~ January 2025
Generator Efficiency 97%

Transformer

Type of Transformer Out Door Oil Immersed
Rated Capacity 10 MVA
Voltage Ratio 6.6/33 KV
No. of Units One number of three phases
Vector Group YNd11
Transformer Efficiency 99%

Transmission Line

Voltage Level 33 KV
Single Circuit Length 10.0 Km
Conductor Type ACSR Dog Conductor
Connection Hitar Sub-station

Financial

Project Cost NRs. 1,503.02 Million
NPV NRs. 687.36 Million
B/C Ratio 1.56
IRR 17.66 %

Construction period 2 year