(Salient Features of the Project)
1 Project Location
Development Region Eastern
Zone Mechi
District Illam
Intake Site Godak VDC
Powerhouse Site Chisapani, Godak VDC
Geological Co-ordinates:
Latitude 26°50’50″N to 26 52′36″N
Longitude 87 °54′ 42.5”E to 87°56’11″E

2.General
Name of River: Mai Khola/Puwa HEP Tailwater
Nearest Town llama Bazar
Type of Scheme Run-of-river
Gross Head 71.45 m
Net Head 66.20 m
Installed Capacity 8000kW
Average Annual Energy after Outage 48.351 GWh

3 .Hydrology
Catchment Area 125.10 Km2(Puwa Khola )
371 Km2 (Mai Khola)
Mean Annual Discharge 1.488 m3/s ( Puwa Khola )
22.138 m3/s (Mai Khola)
Design Discharge (at 45% PoE) 14.46 m3/(12 m3/s for MKSHP &
2.46 m3/s for Puwa Khola HEP)
Riparian Release 0.128 m3/sec
100 Yrs Flood Discharge 1765 m3/s
Average Annyal Precipitation 2584mm

4.Approach Canal/Siphon
Canal Type Covered Concrete Canal
Size Canal 3.0 m *3.0 m
Canal Length 2400 m
Length of siphon 100 m
Diameter of Siphon 1050 m,steel pipe
5.Forebay/Spillway
Capacity 720 m3
Length 12m
Size(W x D) 12m x 5.0 m
Spillway length 10m
Operathing spillway Head 350 mm
Normal water Level EL. 434.47 m

6.Steel Penstock Pipe
Type Steel,Exposed on Surface
Length: 1753.35m
Internal diameter(Avg) 2.57 m
Min steelThickness 8 mm
Nos of anchor blocks 33

  1. Powerhouse
    Туре Surface
    size 15 x 11m
    Height 15 m
    Turbine Axis Level EL. 386.81m

8.Tailrace
Type Rectangular,RCC covered
Length 300m
Size: 3.00 m x 3.00 m
Tail Water level at Outlet EL.365.45m

  1. Turbine
    Туре Horizontal Axis Francis
    Number Two
    Rated Output Capacity per Unit Efficiency 4200 kW
    Efficiency 90.50 %

10 Governor
Type Electronic with PID Control
Adjustment for Speed Droop Between 0 to 5%

11 Generator
Type Synchronous, Three phase
Rated output capacity per unit 4705 kWA
Power factor 0.85
Voltage 6.3 kV
Frequency 50 Hz.
No of units Two
Excitation system Brushles
Efficiency 96.50%

12 Transformer
Type Three Phase,ONAN
Nos of units 2 (Two)
Rated capacity per unit 5000 KVA
Voltage Group YNd 11
Voltage ratio 33 kV /6.3 KV
Efficiency 99.0%
13 Transmission Line
Voltage level 33 kV
Length (approx.) 3.50km
From Powerhouse
To NEA proposed Sub Station at Godak (Illam )
Conductor ACSR “DOG”
14 Project Cost Estimate
Total Cost of the project NRs. 1155.254 Million
15 Construction Period 24 Months


(Salient Features of the Project)
1 Project Location
Development Region Eastern
Zone Mechi
District Illam
Intake Site Godak VDC
Powerhouse Site Chisapani, Godak VDC
Geological Co-ordinates:
Latitude 26°50’50″N to 26 52′36″N
Longitude 87 °54′ 42.5”E to 87°56’11″E

2.General
Name of River: Mai Khola/Puwa HEP Tailwater
Nearest Town llama Bazar
Type of Scheme Run-of-river
Gross Head 71.45 m
Net Head 66.20 m
Installed Capacity 8000kW
Average Annual Energy after Outage 48.351 GWh

3 .Hydrology
Catchment Area 125.10 Km2(Puwa Khola )
371 Km2 (Mai Khola)
Mean Annual Discharge 1.488 m3/s ( Puwa Khola )
22.138 m3/s (Mai Khola)
Design Discharge (at 45% PoE) 14.46 m3/(12 m3/s for MKSHP &
2.46 m3/s for Puwa Khola HEP)
Riparian Release 0.128 m3/sec
100 Yrs Flood Discharge 1765 m3/s
Average Annyal Precipitation 2584mm

4.Approach Canal/Siphon
Canal Type Covered Concrete Canal
Size Canal 3.0 m *3.0 m
Canal Length 2400 m
Length of siphon 100 m
Diameter of Siphon 1050 m,steel pipe
5.Forebay/Spillway
Capacity 720 m3
Length 12m
Size(W x D) 12m x 5.0 m
Spillway length 10m
Operathing spillway Head 350 mm
Normal water Level EL. 434.47 m

6.Steel Penstock Pipe
Type Steel,Exposed on Surface
Length: 1753.35m
Internal diameter(Avg) 2.57 m
Min steelThickness 8 mm
Nos of anchor blocks 33

  1. Powerhouse
    Туре Surface
    size 15 x 11m
    Height 15 m
    Turbine Axis Level EL. 386.81m

8.Tailrace
Type Rectangular,RCC covered
Length 300m
Size: 3.00 m x 3.00 m
Tail Water level at Outlet EL.365.45m

  1. Turbine
    Туре Horizontal Axis Francis
    Number Two
    Rated Output Capacity per Unit Efficiency 4200 kW
    Efficiency 90.50 %

10 Governor
Type Electronic with PID Control
Adjustment for Speed Droop Between 0 to 5%

11 Generator
Type Synchronous, Three phase
Rated output capacity per unit 4705 kWA
Power factor 0.85
Voltage 6.3 kV
Frequency 50 Hz.
No of units Two
Excitation system Brushles
Efficiency 96.50%

12 Transformer
Type Three Phase,ONAN
Nos of units 2 (Two)
Rated capacity per unit 5000 KVA
Voltage Group YNd 11
Voltage ratio 33 kV /6.3 KV
Efficiency 99.0%
13 Transmission Line
Voltage level 33 kV
Length (approx.) 3.50km
From Powerhouse
To NEA proposed Sub Station at Godak (Illam )
Conductor ACSR “DOG”
14 Project Cost Estimate
Total Cost of the project NRs. 1155.254 Million
15 Construction Period 24 Months