घुन्साखोला
GKHEP, as proposed in the present study, has an installed capacity of 77.5 MW. GKHEP is designed as a SRoR scheme. Its headworks consists of an ungated weir with two under sluices, a side intake, and a pair of pressurized underground desilting chambers on the right bank of Ghunsa Khola at Lamatar. The GKHEP project area is located entirely in the Phaktanglung Rural Municipality of Taplejung District. It lies in the Himalaya region of Nepal. The electricity generated from the project will be evacuated through the Dhungesanghu substation.
SALIENT FEATURES OF GKHEP (AS PER FINALIZED LAYOUT & POWER POTENTIAL STUDIES) | |
Type | Simple Run off the River |
Location | |
Latitude | 27° 31' 46'' to 27° 34' 00'' N |
Longitude | 87° 48' 20'' to 87° 51' 38'' E |
River | Ghunsa Khola |
Hydrology | |
Catchment area at intake site | 726.75 km² |
Design flood at intake (Q100) | 880.00 m³/s |
Flood at intake (Q10,000) | 1442.00 m³/s |
General Hydraulics | |
Gross head | 432.00 m |
Net head | 425.55 m |
Design flow Q43 | 21.28 m3/s |
Upstream Pond Level | 1947.0 m |
C/L of Machine | 1515.0 m |
High Flood Level at Head works (Q100) | 1951.50 m |
River Diversion Arrangement | |
Monsoon flood (5 Year Return Period) | 502 m³/s |
Coffer Dam Type | Rock fill Dam |
Diversion Tunnel | |
Length | 288.0 m |
Type and Finished Size | D- shaped, 6.5 m x 6.5 m with gate at inlet |
Bed Slope | 1 in 40 |
Diversion Weir | |
Type | Un-gated weir and under sluice |
Undersluice | 2 Nos., 4.5 m (W) x 4.5 m (H), Radial Gated |
Spillway | Un-gated, 35 m wide |
Intake | |
Type | Well type side intake with trash rack |
Size of opening | 2 Nos., 3.1 m (W) x 3.1 m (H) |
Trash rack opening | 4 Nos., 3.5 m (W) x 3.5 m (H) |
Connecting Tunnels | |
Shape | D- Shaped |
Size (width x height) | 3.10 m x 3.10 m |
Length | 155.60 m (Connecting Tunnel #1) |
112.80 m (Connecting Tunnel #2) | |
Desilting Chambers | |
Type | Underground |
Size (nos x length x width x height) | 2 No - 62 m x 11.5 m x 14.65 m |
Particle size to be removed | 0.2 mm with > 90 % trapping efficiency |
Silt Flushing Arrangement | |
Flushing operation mode | Continuous |
Silt Flushing Tunnel, SFT (Shape, Dia) | D-Shape, 3.9 m x 3.9 m |
Length of SFT | 234.34m |
Slope | 1 in 50 |
Flushing Gate Chamber | |
Type &Size (Length x width x height) | D-Shape, 13 m x 10.0 m x 15.5 m |
Silt Flushing Gate | |
Bonnet type hydraulically operated (No. x width x height) | 2.0 x 1.5 m x 2.0 m |
Link Tunnels to HRT | |
Shape | D- Shaped |
Size (width x height) | 3.90 m x 3.90 m |
Length | 88.79 m |
Headrace Tunnel | |
Shape | D- Shaped |
Length | 4319 m |
Size (width x height) | 3.90 m x 3.90 m |
Lining | Concrete |
Flow Velocity | 1.57 m/s |
Bed Slope | 1 in 160.0 |
Construction Adits | |
Number, Length | 4 Nos.,A1=186m,A2=241m,A3=305m,A4=133m |
Shape and Size (width x height) | D- shaped, 4.5 m X 4.5 m |
Surge Shaft | |
Type | Simple Orifice, Concrete lined |
Internal diameter | 6.0 m |
Height | 56.4 m |
PRESSURE SHAFT (Underground) | |
Type & Diameter | Circular Steel Lined, 3.0 m |
Length | 626.3 m |
Construction Adit | 1 No, 4.5m D shape, 300 m long at El 1715m |
Velocity at design discharge | 3.01 m/s |
Unit Penstock | |
No. of Unit Penstock | 3 |
Total Length | 35.78 m (Unit- 1 & 3) |
30.00 m (Unit- 2) | |
Type and Diameter | Circular Steel Lined, 1.70 m |
Power House Cavern | |
Type | Underground |
Length x Width x Height | 84.00 m x 16.0 m x 36.00 m |
C/l of Turbine | 1515.00 m |
MIV Floor | 1513.00 m |
Turbine Floor | 1516.50 m |
Generator Floor | 1520.85 m |
Service Bay Floor | 1525.40 m |
Transformer and GIS Cavern | |
Type | Underground |
Length x Width x Height | 80.00 m x 13.0 m x 25.50 m |
Transformer Floor | 1525.40 m |
GIS Floor | 1534.06 m |
Main Access Tunnel (MAT) | |
Length | 201.18 m |
Type and Excavated Size | D- shaped, 7.0 m x 7.0 m |
Cable Cum Ventilation Tunnel (CVT) | |
Length | 201.18 m |
Type and Excavated Size | D- shaped, 4.5 m x 4.5 m |
Tailrace Tunnel & Outfall Structure | |
TRT Length | 650.00 m |
Type and Excavated Size | D- shaped, 4.5 m x 4.5 m |
Gate Size at outfall (Width x Height) | 3.9 m x 3.9 m |
Slope | 0.493055556 |
Type of flow | Free Flow |
Velocity | 2.63 m/s |
Generation Plant | |
Turbine Type | Pelton |
Number | 3 |
Rated Capacity | 25.80 MW |
Rated Net Head | 425.55 m |
Rated Discharge | 7.09 m³/s |
Speed | 375 rpm |
Generator | |
Number | 3 |
Rated Capacity | 29.2 MVA |
Voltage | 11 kV |
Total Energy Output at Generator Terminals | |
At Normal Load | 458.58 GWh |
Transformer tYPE | Single Phase |
Number | 9 + 1 spare |
For more information;
https://remithydro.org.np