RK Complex – Sitapaila, Kathmandu superhewaac@gmail.com
+977-1-5314512

Project Overview

Super Hewa Khola Hydropower Project - 6 MW

Super Hewa Infrastructure

Super Hewa Khola Hydropower Project

Super Hewa Khola Hydropower Project is a 6 MW Run of River (ROR) type project located at Hewa Khola, between Chainpur and Panchkhapan Municipality of Sankhuwasabha District, Koshi Pradesh, Nepal. The project is situated near Chinpur, the oldest Newari town.

The project corresponds to a design discharge of 2.20 m3/s at Q42.5% including Khawa Khola collection on headworks. The intake/decender structure is located at Oringa, while the flushing gate of headrace is located at Oringa Khola, followed by a gravel basin, headrace, and penstock pipeline spanning at least 3 km that passes through Bansghari, Muchhebung, Thebe gaun, and the powerhouse.

The switchyard is located at Muchhebung of Chainpur Municipality on the right bank of the Hewa Khola river. The generated electricity is transferred from the switchyard to the Baneshwor sub-station by a 33 KV single-circuit transmission line, which is 13 km long. The project area belongs to the middle mountain region with a rain-fed catchment on the upper Hewa Basin in Sankhuwasabha.

Technical Details

Salient Features

ProvinceProvince 01
ZoneKoshi
DistrictSankhuwasabha
Intake SiteBhangtar, just downstream of Hewa-Sewa confluence
Powerhouse SiteAgaksu, upstream of Upper Hewa Khola Hydropower Project's headworks
Geographical Co-ordinatesLatitude: 27º 20' 55'' N to 27º 22' 15'' N
Longitude: 87º 22' 25'' E to 87º 24' 22'' E
Conservation Area-

Name of RiverHewa and Khawa Khola
Nearest SettlementPokhari Bazar/Chainpur
Type of SchemeRun-of-river (RoR)
Gross Head331.40 m
Net rated Head320.59 m
Installed Capacity6000 kW
Average Annual Energy after Outage35.72 GWh
Dry Season Energy11.14 GWh
Wet Season Energy24.58 GWh

Catchment AreaAt intake: 39.76 km2 (Hewa 33.52 km2 + Khawa 6.24 km2 + Oringe 2.89 km2)
At powerhouse: 55.8 km2
Average Annual Discharge2.76 m3/s
Design Discharge (at 42.5% PoE)2.20 m3/s
Riparian Release0.055 m3/s
Design Flood DischargeHeadworks: 68 m3/s
Powerhouse: 98 m3/s
Average Annual Precipitation2343 mm

Diversion Weir
Type of WeirDiversion weir with side intake
Length of Weir18.50 m
Crest Elevation1506.00 masl
Spillway TypeSide spillway
Undersluice Opening (W x H)2.50 m x 2.50 m
Undersluice Invert Level1502.10 masl
Intake Structure cum Gravel Trap
Type of IntakeSide intake with trashrack
Number of Openings2 nos.
Size of Intake (W x H)2.0 m x 0.9 m
Intake Sill Level1505.00 masl
Length of Gravel Trap15.0 m
Average Width of Gravel Trap4.0 m
Overall Depth(2.5 - 3.9) m
Particle Size to be TrappedUp to 20 mm
Flushing Channel1.0 m x 1.0 m
Desanding Basin
TypeDufour double chamber type
Dimension (L x B x H)50.0 m x 5.0 m x (4.3 - 5.2) m
Inlet Transition Length10 m
Particle Size to be Settled0.20 mm
Trapping Efficiency95%

Khawa Collection Typology

Diversion Weir: Temporary type weir by gabion structure
Intake: Drop intake (0.50 m x 0.50 m)
Gravel Trap: RCC Gravel trap
Collection Pipe: 1490 m long buried 0.50 m dia. HDPE pipe

Oringe Collection Typology

Diversion Weir: Temporary type weir by gabion structure
Intake: Drop intake (0.50 m x 0.50 m)
Gravel Trap: RCC Gravel trap
Collection Pipe: 332 m long buried 0.28 m dia. HDPE pipe

Headrace Pipe
TypeMild steel welded pipe
Internal Diameter1.35 - 1.15 m
Length3146.55 m
Steel Thickness / Type of Lining7 - 20 mm
Number of Anchor Blocks64 nos.
Surge Tank / Forebay
TypeSurge pipe
Connection Pipe Length78.60 m
Total Length83.55 m
Up Surge Level1515.20 masl
Down Surge Level1494.90 masl
Steel Penstock Pipe
TypeMild steel welded pipe
Internal Diameter1.05 m and 0.74 m
Length674.35 m with branch pipe
Steel Thickness7 - 20 mm
Number of Anchor Blocks10 nos.
Number of Saddle Supports46 nos.

Powerhouse
TypeSurface with indoor switchyard
Size (L x W)28.50 m x 17.50 m
Height18.9 from floor level
Turbine Axis Level1174.50 masl
TailraceType: Rectangular RCC closed
Length: 49.0 m
Size (W x D): (1.4 - 2.0) m x 2.0 m
Water Level: 1172.20 masl
TurbineType: Horizontal axis Pelton
Number: 2 nos.
Rated Output per Unit: 3125 kW
Net Head: 320.59 m
Discharge per Unit: 1.10 m3/s
Efficiency: 90%
GovernorType: Electronic PID Control
Adjustment for Speed Drop: Between 0-5%
GeneratorType: 3-phase AC synchronous
Rated Output per Unit: 3530 kVA
Power Factor: 0.85
Generation Voltage: 6.6 kV
Number of Units: 2 nos.
Efficiency: 96%
TransformerType: Outdoor step-up power transformer
Rated Capacity: 7200 kVA
Voltage Levels: 33/6.6 kV
Number of Units: 1 nos.
Efficiency: 99%
Transmission Line
Voltage Level33 kV
Length13.50 Km
Conductor TypeACSR DOG, 100 mm2
FromPower plant switchyard
To33/220 kV Baneshwar substation
Logistics

Accessibility & Location Maps

The project site is accessible from Kathmandu via Kathmandu-Bardibas-Itahari-Chainpur road with a total distance of approximately 525 km. The project access road length is about 9 km from Chainpur to the headworks site, which starts from Pokhari Bazar on Chainpur-Nundhaki Highway. Another road also starts from the powerhouse via the lower project headworks.

Superhewa Accessibility Map 1
Superhewa Accessibility Map 2
Superhewa Profile Map
Superhewa Layout
Address

RK Complex – Sitapaila, Kathmandu

+977-1-5314512

superhewaac@gmail.com

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