COMPARATIVELVE SALIENT FEATURES OF THE PROJECT
COMPARATIVELVE SALIENT
FEATURES OF THE PROJECT
1 |
ProjectLocation |
Previous
|
Latest
|
|
Development Region |
: Eastern |
: Eastern |
|
Zone |
:Mechi |
:Mechi |
|
District |
:Ilam |
:Ilam |
|
Intake Site |
:Sulbung and Pyang VDCs,Bhirgaun |
:Sulbung and PyangVDCs,Bhirgaun |
|
Power house Site |
:Sumbek
VDC-5,Gangate |
:Sumbek VDC-5,Gangate |
|
GeographicalCo-ordinates |
|
|
|
Latitude |
:26°58′08″N to 26°59′59″N |
:26°58′08″N to 27°00′10″N |
|
Longitude |
:87°57′36″E
to 87°58′26″E. |
:87°57′36″E
to 87°58′26″E. |
2 |
General |
|
|
|
Name of
River |
:Mai
River |
:Mai River & Samaha River |
|
Nearest Town |
:Ilam Bazar |
:Ilam Bazar |
|
Type of Scheme |
:Run-of-River |
:Run-of-River |
|
Gross Head |
:199.3m |
:199.3 m |
|
Netrated
Head |
:186.03m |
:186.03 m |
|
Installed Capacity |
:9.6MW |
:9.6 MW |
|
Average Annual Energy after Outage |
:56.47GWh |
:56.47 GWh |
|
Dry Energy |
:4.75GWh |
:4.75 GWh |
|
Wet Energy |
:47.72GWh |
:47.72 GWh |
3 |
Project Hydrology |
|
|
|
Catchment Area (Mai
Khola) |
: 129 km2 (Mai & Samaha khola) |
: 98 km2(Mai khola) |
|
Mean Annual Discharge |
:8.7m3/sec |
:8.7m3/sec |
|
Design Discharge (at40%PoE) |
:6.4m3/sec |
:6.4m3/sec |
|
Design Flood Discharge
(100-yrs Flood at Mai Khola) |
:680m3/sec |
:680m3/sec |
|
Average Annual Precipitation |
:2328.0mm |
:2328.0mm |
|
Catchment Area at
Headwork (Samaha Khola) |
|
: 31 km2 (Samaha khola) |
|
Design Flood Discharge(100-yrsFlood
at Samaha Khola) |
|
:278m3/sec |
|
Combined catchment Area |
: 129 km2 |
: 129 km2 |
4 |
Diversion Weir |
|
|
4.1 |
Mai Khola |
|
|
|
Typeof Weir |
:Broad crest type concrete gravity Dam |
:Broad crest type concrete gravity Dam |
|
Length of Weir |
:25.5m |
:25.5 m |
|
Crest Elevation |
:1055.5amsl |
:1055.5 amsl |
|
Spillway type |
:Free over flow |
:Free over flow |
|
Under sluice Opening(WX H) |
:2.5mx3m |
:2.5mx3 m |
|
Unders luice Crest Level |
:1051.16m |
:1051.16 m |
4.2 |
Samaha Khola |
|
|
|
Typeof Weir |
|
: Free Overflow Tyrolean Boulder weir |
|
Length of Crest |
|
:10.0m |
|
Crest Elevation |
|
:1059.35 amsl |
|
Crest Width |
|
: 1.5 m |
5 |
Intake Structurecum Gravel Trap |
|
|
5.1 |
Mai Khola |
|
|
|
Type of Intake |
:Orifice side intake |
:Orifice side intake |
|
No’s of Opening |
:3 |
:3 |
|
Sizeof
Intake(Wx H) |
:2.0mx1.4m |
:2.0mx1.4m |
|
Intake Sill Level |
:1053.6m |
:1053.6m |
|
Length of Gravel Trap |
:9m |
:9m |
|
Width of Gravel Trap (Avg.) |
:7.6m |
:7.6m |
|
Overall depth |
:3.8m |
:3.8m |
|
Particle size to betrapped |
:2mmor larger |
:2mmor larger |
|
Flushing Channel |
:0.8mx0.8m(HxW) |
:0.8mx0.8m(HxW) |
5.2 |
Samaha Khola |
|
|
|
Typeof Intake |
|
:Botto min take with invert slope of 1 in 12.5 (V:H) |
|
No’s of Opening |
|
:1 |
|
Size of
Intake (Lx w) |
|
:10.0mx1.5m |
|
Intake invert Level |
|
: Varies from (1057.90m - 1057.13 m ) |
|
Length of Gravel Trap |
|
:4.1m |
|
Width of GravelTrap |
|
:4.0m |
|
Overall depth (Avg.) |
|
:4.52m |
|
Particle size to be
trapped |
|
:2mm or larger |
|
Flushing Channel |
|
:0.5mx0.5m(HxW) |
6 |
Approach Canal( Mai
Khola) |
|
|
|
Type |
:
Concrete Box |
: Concrete Box |
|
No.of
canal |
:1 |
:1 |
|
Length |
:48.5m |
:48.5m |
|
Size(Wx
B) |
:2.4 mx1.5m |
:2.4mx1.5m |
7 |
Settling Basin |
|
|
|
Type |
:Concrete,Doublebay |
:Concrete,Doublebay |
|
Dimension (LxBx H) m |
:(56x5.6x
4.45) m |
:(56x5.6x 4.45) m |
|
InletTransition
Length |
:18m |
:18m |
|
Particle Size to besettled |
:0.2 mm |
:0.15mm |
|
Trapping Efficiency |
:95% |
:95% |
|
Size of headpond |
|
: (7x6x 5.95) m |
8 |
Collection Pond at
Samaha Khola Headworks Type |
|
|
|
Size (L x B ) |
|
:3.88 m x 2.90 m |
|
Height (Avg.) |
|
:3.63m |
9 |
HeadracePipe Type |
:SteelPipe |
:Steel Pipe |
9.1 |
Headrace Pipe Mai Khola |
|
|
|
Internal Diameter (Before
bifurcation) |
:1.8m |
:Varies (1.95 mto1.65m) |
|
Length |
:4296
m |
:3749m |
|
Steel Thickness |
:8mm
to 12mm |
:8 mm to 12 mm |
|
Nos. of AnchorBlocks |
:52 Nos. |
:45 Nos. |
9.2 |
Connecting Pipe from
Samaha Khola |
|
|
|
Internal Diameter |
|
:Varies (1.1m,1.0m & 0.9 m) |
|
Length |
|
:299 m |
|
Steel Thickness |
|
:6mm |
|
Nos. ofAnchorBlocks |
|
: 9 Nos. |
10 |
SurgeTank Type |
:Sub-Surface,concrete |
:Surface,concrete |
|
Diameter |
:7.0m |
:7.0m |
|
Height |
:27.0m |
:27.0m |
11 |
Penstock Pipe
|
|
|
|
Type |
:Steel
Pipe |
:Steel Pipe |
|
Internal Diameter |
:1.55 m |
:1.55m |
|
Length |
:474 m |
:474m |
|
Steel Thickness |
:12 mm
to 26 mm |
:12 mm to 24mm |
|
Nos. of Anchor
Blocks |
:8 Nos. |
:8Nos. |
12 |
Powerhouse
|
|
|
|
Type |
: Sub-Surface |
:Surface |
|
Size(LxW) |
: Size (36.4 m x 9 m) |
: Size (36.4 m x 9 m) |
|
Height |
:12.0m |
:12.0 m |
|
Tailrace Water Level |
:856 amsl |
:856 amsl |
|
Tailrace Length |
:54 m |
:54 m |
13 |
Turbine Type |
:Francis |
:Francis |
|
Number |
:3 |
:3 |
|
Rated Output Capacity per unit |
:3.2 MW |
:3.2MW |
|
Turbine Axis Level |
:858.5m |
:858.5 m |
|
Net Head |
:186.03m |
:186.03 m |
|
Discharge per
Unit |
: 2.13 m3/sec
|
: 2.13 m3/sec |
|
Efficiency |
:90%(rated discharge) |
:89%(rated discharge) |
14 |
Governor |
|
|
|
Type |
:Digital
Electronic with PID type |
:Digital Electronic with PID type |
|
Adjustment for Speed Drop |
: Adjustable to any degree between and 10%zero |
: Adjustable to any degree between and 10%zero |
15 |
Generator |
|
|
|
Type |
:Salient
pole,synchronous |
:Salient pole, synchronous |
|
Rated Output Capacity per
Unit |
:3764 Kva |
:4.0Mva |
|
Power Factor |
:0.85 |
:0.85 |
|
Voltage |
:6.6 kV |
:11kV |
|
Frequency |
:50Hz |
:50Hz |
|
No of
Units |
:3 |
:3 |
|
ExcitationSystem |
:Brushless |
:Self-excited |
|
Efficiency |
:96% |
:95% |
16 |
Transformer
|
|
|
|
Type |
:Three phase,single |
:Three phase,single |
|
Rated Capacity |
:12Mva |
:12Mva |
|
Voltage Ratio |
:11/√3/132/√3 |
:11/√3/132/√3 |
|
Vector Group |
:YNd11 |
:YNd11 |
|
Power Factor |
:.85 |
:.85 |
|
Generation Voltage |
|
:6.6 Kv |
17 |
TransmissionLine |
|
|
|
Voltage Level |
:132 KV
single circuit line ACSR |
:33KV single circui tline |
|
Length |
: Approximate 12 Km |
: Approximate 12 Km |
|
From |
: P/H site, Sumbek-5, Dadagaun |
: P/H site, Sumbek-5, Dadagaun |
|
To |
: Godak Sub-station |
: Godak Sub-station |
18 |
Project Cost Estimate |
|
|
|
Total Cost of
the Project W/O IDC |
:
NRs. 1,683,069,416 |
: NRs. 1,683,069,416 |
|
Total Cost of
the Project with IDC |
:
NRs. 1,820,495,249.65 |
: NRs. 1,820,495,249.65 |
|
Interest rate |
:
11% |
: 11% |
|
NVP |
:
460,511,234 |
: 460,511,234 |
|
B/C
ratio |
:
1.29% |
: 1.29% |
|
IRR |
:
14.91 % |
: 14.67 % |
|
ROE |
:
17.75% |
: 17.75% |
19 |
Access road |
|
|
|
Upgrading |
:
15 km |
: 15 km |
|
New Track opening |
: 9
km |
: 9 km |
20 |
Environmental Flow |
|
|
|
Down stream Release Mai khola |
:
0.157 m3/sec |
: 0.157 m3/sec |
|
Down stream Release Samaha
khola |
:
0.048 m3/sec |
: 0.048 m3/sec |
|
Construction period |
: 3
years |
: 2 years (excluding licensing and
financial closure) |
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