Midim Khola

Midim Khola (KARAPU) Hydropower Project

Background

Midim Khola Hydropower Project is the first project developed by Union Hydropower Ltd. located at Karaputar, Lamjung. The project has been generating energy from 15th Magh, 2074. With reliable discharge, the project has been supplying valuable energy in today’s vast energy deficit scenario.
 
General
Source River : Midim River
District : Lamjung
Zone : Gandaki
Development Region : Western
Province : Gandaki
Type of Scheme : Run-of-River
Latitude : 28012’15” N to 28010’53” N
Longitude : 84017’30” E to 84016’31” E
Gross Head : 51.98 m
Net Head : 48.69 m
Design Discharge : 7.30 m3/s
Installed Capacity : 3.00 MW
Hydrology
Catchment Area : 136.50 km2
Design 100-yrs Flood : 460 m3/s
Diversion Weir
Weir Type : Concrete Infilled Boulder Weir
Length : 22.0 m
Crest Level : 592.80 amsl
Height : 5.50 m
Intake
Type : Side Intake
No : 2
Opening Size : 3.30 X 2.0 m (W x H)
Velocity of flow : 0.8 m3/s
Undersluice
Size (W X H) : 2 X 2 m
No. of Bays : 2
   
Gravel Trap
Length of Gravel Trap : 1.90 m
Width of Gravel Trap : 7.80 m
Length of Flushing Culvert : 60.0 m
Approach Canal
Type : RCC culvert
Length : 170.92 m
Width : 2.20 m
Depth including Freeboard : 2.30 m
Desilting Basin
Location : Surface
No of Basin : 2
Size (L x W x H) : 42 m x 5 m x 4.2 m
Particle Size to be settled : 0.2 mm
Headrace Pipe
Type : Circular
Diameter : 2 m
Length : 223.20 m
Headrace Tunnel
Type : Inverted D-Shape
Length : 1120.21 m
Surge Tank
Type : Top over to sky
Diameter (Finished) : 6 m
Height : 22.55 m
Top level : 600.95 amsl
Upsurge Level : 598.45 amsl
Down surge Level : 585.45 amsl
Penstock Pipe
Length : 120.00 m
Diameter : 1.80 m
Powerhouse
Location : Surface
Clear Size (L x B x H) : 23.3 m x 8.55 m x 20.40 m
Number of Units : 2 Nos.
Type of Turbine : Horizontal Axis Francis Turbine
Rated Capacity : 1.5 MW x 2 Nos.
Tailrace Canal
Size (B X H) of RCC culvert : 2.5 X 1.90 m (inside dimension)
Length : 200.00 m
Transmission & Grid Connection
Specification : 33 kV
Conductor : ASCR Dog
Length : 8.5 km
Generator
No. of Units : 2
Efficiency : 96.51 %
Power and Energy
Installed Capacity : 3.00 MW
Dry Season Energy : 2.91 GWh
Wet Season Energy : 14.28 GWh
Total Annual Energy (PPA) : 17.19 GWh
Others 
Commercial Operation Date : 2074/10/15