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Upper Suri Khola Hydropower Project (7 MW)

Upper Suri Khola Hydropower Project (7 MW)


 

Description of the Project 

Company

Makar Jitumaya Suri Hydropower Ltd.

Type

Public Limited Company

Address

United World Trade Center, Tripureshwor, Kathmandu

Establishment

2065/08/17 B.S.

Telephone number

+977-1-4117008

Email

hydro.makarjitumaya.surikhola@gmail.com

 

PAN no

303353313

Registration no.  at   Office of Company

Registrar

123684/070/071

Department of Industry Registration No

5009/2075/076

Project under development

Upper Suri Khola Hydropower Project – 7MW

Survey license no.

Bi.Bi.Bi.071/72 Bi.U.Sa.698

Generation license no

Bi.Bi.Bi.0776/77  Bi.U 268

Project Location

27° 43' 00" to 27° 45' 00" North,

86° 15' 00" to 86° 17' 30" East

Project Background

Upper Suri Khola Hydro Power Project (USKHPP) is a run-of-river type project with weir crest level at 1827 amsl for Hulak Khola, 1824 amsl for Kolung Khola and turbine axis is fixed at elevation at 1405 amsl. The gross head for this project layout is computed as 422m. The water from the intake is diverted to the water conveyance system through the gravel trap, settling basin and head pond. Then water is feed to powerhouse through 2916 m long headrace pipe from Hulak 1156 m long headrace pipe from Kolung and 810 m penstock pipe to hit the turbine. The generated power will be evacuated by 33 kV single circuit transmission line at proposed Singati substation of Dolakha district. The length of 33 kV transmission line will be about 11 km.

Project Location and Accessibility

The project area is located between 1407m to 1827 m above mean sea level in the reach of suri Khola. Geographically the project area is located between longitudes 86°  17‟ 00”E to 86° 15‟ 10”E and latitudes 27° 44‟30” N to 27° 43‟30” N. Entire project components of project lies in Gaurisankhar Rural Municipality. The project area location map is shown in map below. The powerhouse is linked by 12 km long fair-weather earthen motorable road starting from Singati Bazar.

USKHPP is located in Dolakha district, Bagmati Province of Nepal. The district headquarter is Charikot on the Lamosangu-Charikot highway. The distance from project site to Charikot is about 45 km. There is a regular bus service from Charikot to Gurumphi on the left bank of Tamakoshi River. Gurumphi is at the confluence of Suri Khola and Khare Khola. Powerhouse are of the project is about 3.5 km from Gurumphi. Project access from Kathmandu is shown in Table

Project accessibility

S.N

Distance from

To

Distance(Km)

Description Route

1

Kathmandu (Maitighar)

Khadichaur

78

Arniko Highway

2

Khadichour

Charikot

55

Lamosangu-Jiri Highway

3

Charikot

Singati

35

Graveled Road

4

Singati

Bhorle

4.5

Graveled Road

5

Bhorle

Power house

7.5

Earthen road already built

 

Access road

From power house to intake

7

Earthen road

Total Road Length From Kathmandu to  PH

180

 

Salient Features of the Project

 

General

 

 

 

 

Development region

 

Central

 

 

Zone

 

Janakpur

 

 

District

 

Dolakha

 

 

District headquarter

 

Charikot

 

 

VDC

 

Chankhu and Suri

 

 

Project location

 

 

 

 

Longitude

 

86°15'10" and 86°17'00" East

 

 

Latitude

 

27°43'30" and 27°44'30" North

 

 

Type of scheme

 

Run of river (RoR)

 

 

Source river

 

Hulak Khola and Kolung Khola

 

 

Hydrology Hulak Khola

 

 

 

 

Catchment area

 

23 km2

 

 

Mean annual precipitation

 

1650 mm

 

 

Design discharge

 

1.678 m3/s (Q40.32%)

 

 

Compensation flow

 

0.032 m3/s

 

 

1 in 100 years return period design flood

 

114.063 m3/s

 

 

1 in 5 years return period operation flood

 

43.99 m3/s

 

 

 

Kolung Khola

 

 

 

 

Catchment area

 

3.68 km2

 

 

Mean annual precipitation

 

1650 mm

 

 

Design discharge

 

0.35 m3/s(Q48.8%)

 

 

Compensation flow

 

0.011 m3/s

 

 

1 in 100 years return period design flood

 

52.891 m3/s

 

 

1 in 5 years return period operation flood

 

14.585 m3/s

 

 

1 in 2 years return period diversion flood

 

7.022 m3/s

 

 

Project components Hulak Khola

 

 

 

 

Weir

 

 

 

 

Type

 

Concrete lined weir

 

 

Crest level

 

1827 m amsl

 

 

 

Length of weir

 

25 m including undersluice

 

 

 

Spillway type

 

Free overflow

 

 

 

Intake

 

 

 

 

 

Type

 

Gated submerged orifice intake with course trash rack

 

 

 

Nos. of opening

 

2 nos

 

 

 

Opening size

 

2.0m long X1.0 m

 

 

Gravel trap

 

 

 

 

Type

Continuous flushing hopper type

 

 

 

Overall length

11.118 m

 

 

 

Width

2.80 m

 

 

 

Overall depth

2.60 m

 

 

 

Particle size to be trapped

5 mm

 

 

 

Design flow

2.18 m3/s

 

 

 

Flushing flow

0.35 m3/s

 

 

 

Settling basin

 

 

 

 

Type

Double chamber, gravity flushing type

 

 

 

Settling zone length

36.00 m

 

 

 

Inlet transition length

13.80 m

 

 

 

Single basin width

3.00 m

 

 

 

Overall depth

2.5 m

 

 

                       

Particle size to be settled         0.15 mm with 90% settling efficiency

 

Design flow

1.93 m3/s

 

 

Approach canal

 

 

 

Type

Box type

 

 

Length

107.75 m

 

 

Width

1.50 m

 

 

Overall depth

1.05 m

 

 

L-slope

1:250

 

 

Overflow spillway length

7.84 m

 

 

Overflow spillway capacity

10 m3/s

 

 

Headrace Pipe Hulak

 

 

 

Type

Mild Steel Pipe

 

 

Length

2916 m

 

 

Diameter

 

1.20 m

 

L-slope

 

1:750

 

Kolung Khola

 

 

 

Weir

 

 

 

Type

 

Boulder lined weir

 

Crest level

 

1824 m amsl

 

Length of weir

 

6.5 m including undersluice

 

Spillway type

 

Free overflow

 

Intake

 

 

 

Type

Gated submerged orifice intake with course trash rack

 

 

Nos. of opening

2 nos

 

 

Opening size

0.90 m long X0.50 m

 

 

Approach  canal

 

 

 

Type

Box type

 

 

Length

125.624 m

 

 

Width

0.9 m

 

 

Overall depth

0.75 m

 

 

L-slope

1:250

 

 

Overflow spillway length

Not provided

 

 

Overflow spillway capacity

-

 

Gravel trap

 

 

Type

Continuous flushing hopper type

 

Overall length

6.225 m

 

Width

1.6 m

 

verall depth

1.74 m

 

 

 

 

Particle size to be trapped

5 mm

 

Design flow

0.45 m3/s

 

Flushing flow

0.10 m3/s

 

Settling basin

 

 

Type

Double chamber, gravity flushing type

 

Settling zone length

16 m

 

Inlet transition length

9.489 m

 

Single basin width

2.00 m

               

Particle size to be settled   0.15 mm with 90% settling efficiency

Design flow

0.40 m3/s

Headrace Pipe Kolung

 

Type

Mild Steel Pipe

Length

1156 m

Diameter

0.8 m

L-slope

1:750

Surge Tank

 

Type

RCC Circular tank

Storage period

60 s

Effective height

20 m

Diameter

5.50 m

Maximum Upsurge Level         1821.39

Minimum Downsurge level 1805.42

Normal water level

1819 m amsl

Penstock

 

Type

Surface, mild steel circular shaped

Length

810 m

Internal diameter

1.00 m

Thickness

6-26 mm

Design flow

2.028 m3/s

No. of anchor blocks

14

No. of support piers

135

Powerhouse

 

Type

Surface type, RCC structure

Length Width

27.82 m

16.24 m

Height

12.00 m

Tailrace length

6.00m

Turbine

 

Type

Pelton (2 units)

Rated capacity

3500 kW one unit

Turbine axis level

1405 m amsl

Design flow

1.014 m3/s for one unit

 

Generator

 

 

Type

 

3 Phase brushless synchronous (2 units)

Rated capacity

 

4000 kVA each

Rating

 

50 Hz, 750 rpm

Governor

 

Electro-Hydraulic

Overhead crane

 

Lifting capacity 25 T

Step up transformer

 

 

Type

 

3-Phase, ONAN cooled, Outdoor type

Rating

 

2 x 4000 kVA, 6.3/33kV, 50 Hz

 

Transmission line

 

33 kV Double circuit, 3 phase, 50 Hz, 4 km  long to SKHP Powerhouse

Connection with grid

 

Singati sub-station

Access road

 

Earthen road, 7 km long

Cost and finance

 

 

Project cost (with IDC, )

 

1200.10 Mill NRs

Cost per kW (with IDC)

 

1572.88 US$/kW

Debt equity ratio

 

70/30

Interest rate

 

10%

Construction period

 

2 years

FIRR

 

17.79%

NPV

 

795.21 Mill NRs

BC ratio

 

1.71

Return on equity

 

28.14%