1 Project Location
Development Region Eastern
Zone Mechi
District Illam
Intake Site Kahilatur, Godak VDC
Powerhouse Site Rajdhuwali, Godak VDC
Geological Co-ordinates:
Latitude 26°50’50″N to 26 52′36″N
Longitude 87 55’47” E to 87°56’38″E

General
Name of River Mai Khola
Nearest Town llama
Type of Scheme Run-of-river
Gross Head: 50.65 m
Capacity for PPA 4455 Kw
Average Annual Energy after Outage 27.53 GWh

2 .Hydrology
Catchment Area 371 Km2
Mean Annual Discharge 23.26 m3/s
Design Discharge 12.0m3/s
Probability of Exceedance 47%
Riparian Release 0.44m3/sec
Design Flood Discharge 1.765 m3/s (100Yr. flood)
3 Diversion Weir & Undersluice
Type of Weir Concrete Gravity Free Flow
Length of Weir 101 m
Crest Elevation 486.4m
Size of Undersluice Gate (2.0 m x 2.75 m) x 2 Nos.
Bottom Sill elevation 483.17 m

4 Intake
Type Side Intake
Size (3.3 mx 1.50m) x 4 Nos.
Bottom Sill elevation 484.80 m
5 Desilting Basin
Type Dufour Type
No of Chamber 2
Dimension (LxBxH) m 106.0 m x 8.25 m x 3.84 m Particle Size to
be Settled 0.2 mm
6 Headrace Canal
Type RCC Rectangular
Size 2.3 m x 1.7 m
Length 340 m
Longitudinal Slope 1:400

7 Headrace Tunnel
Type Inverted D Shape
Internal Diameter 2.4 m to 2.7 m
Length 741 m
Longitudinal Slope 1:1000

8 Penstock
Length of penstock pipe 334m
Internal diameter 2.2 m to 2.45 m
Thickness 8-12 mm

9 Powerhouse Dimension
Туре Horizontal Axis Francis
Dimension 48 m x 10.0 m x 10.6 m
10 Tailrace Canal
Type Concrete Box Culvert
Length 99.0 m
Size (W x H) 3.1 m x 2.1 m
Normal Tail Water Level 435.75 m

11 Turbine
Туре Horizontal Axis Francis
Number Three
Rated Output Capacity per Unit Efficiency 1.570 kW
Efficiency 90.5 %

12 Governer
Type PLC based Micro computer
with PID
Adjustment for Speed Droop 0-5%

13 Generator
Type Synchronous, Three phase
Rated output capacity per unit 1,500 kW
Power factor 0.85
Voltage 6.6 kV
Frequency 50 Hz.
No of units Three
Excitation system Brushles
Efficiency 96%

14 Transformer
Type Oil Iimmersed. 3 Phase
Rated capacity 4.0 MVA + 2,0 MVA
Voltage ratio 6.6/33 kV
Efficiency 99%

15 Transmission Line to be Constructed by Company
Voltage level 33 kV
Length (approx.) 3.5km
From Powerhouse (HEP)
To Tilkeni sub-station
Conductor ACSR “DOG”

16 Total Cost of the Project NRs. 588.3 Millions

17 Financial Indicators
Return on Equity (ROE) : 20.98%
B/C ratio : 1.66
18 Construction Period : 16 Months