COMPARATIVELVE SALIENT FEATURES OF THE PROJECT

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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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