SR 3 Status Report

8/2/2019 SR 3 Status Report

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NOTE ON 87.5 MW (TENTATIVE) SR-III

HYDRO ELECTRIC PROJECT

Project Highlights

Implementing Agency : M/s Avanti Feeds Limited

River and Location : West Seti River is one of the major tributary of

Karnali River, Bajhang District, Nepal.

Award Details : Based on the identification of Project done by

CIWEC & NEA, the Govt. of Nepal has accorded

Survey license in the year 28th April 2010 for

carrying out the detailed survey investigations and

prepare Feasibility Report for the identified

Project. The area in which Survey is to be done

has also been indicated in the Survey license

issued in favour of M/S Avanti Feeds Limited.Hyderabad (India).

TENTATIVE SALIENT FEATURES

1 LOCATION

(i) Country Nepal

(ii) District Bajhang(iii) River West Seti

(iv)

Location of Barrage site

Latitude

Longitude

29o 32' 50.2" N

81o 11' 22.5" E

(v) Nearest Airport Chainpur

2 HYDROLOGY

(i) Catchment Area 2252.47 Km2

(ii) Submergence Area 5.0 Ha


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(iii) Standard Project Flood 2720 cumec

3 DIVERSION TUNNEL

(i) Shape and Type D-shaped unlined

(ii) Length 500 m

(iii) Diversion Discharge ( flood season) 1430 cumec

4 BARRAGE

(i) Type Stilling Basin

(ii) Barrage top EL 1254.5 m

(iii) River bed level at Barrage site EL 1242.5 m

(iv) Barrage height (above river bed level) 12 m

5 SPILLWAYS

(i) Standard Project Flood 2720 cumec

(ii) Gate size 7 m x 10 m (W X H )

(iii) Numbers 3 gates

6 RESERVOIR

(i) Full Reservoir (FRL) EL 1252.5 m

(ii) Approach Channel 500.0 m

7 POWER CHANNEL

(i) Shape and Type Trapezoidal

(ii) Length 300 m

(iii) Discharge corresponding to Q40 60.6 cumec

8 INTAKE

(i) Numbers One

(ii) Intake invert level EL 1244.5 m

(iii) Design discharge 60.6 cumecs

9 Head Race Tunnel

(i) Numbers One

(ii) Design discharge 60.6 cumec

(iii) Diameter 5.0 m

(iv) Length 8850 m

10 SURGE SHAFT

(i) Diameter 12.0 m


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(ii) Height 66.5 m

11 PRESSURE SHAFT

(i) Numbers One

(ii) Type Steel lined

(iii) Diameter 4 m

(iv) Design Discharge 60.6 cumecs

(v) Pressure shaft length before Bifurcation 460 m

(vi) Length after bifurcation 40 m

12 POWERHOUSE COMPLEX

(i) Type Surface

(ii) Minimum Tail water level EL 1075 m

(iii) Type of turbine Francis

(iv) Generating unit in MW 3 X 29.15 MW

(v) Gross head 177.5 m

(vi) Rated net head 163.5 m

13 TAIL RACE CHANNEL

(i) Shape Trapezoidal(ii) Length 100 m

14 POWER GENERATION

(i) Type Surface

(ii) Installed capacity* 87.5 MW

* The installed capacity have been kept lower. The IC based on hydrological study works outas 136 MW

Hydro Power scenario in Nepal

Nepal has a huge hydropower potential. In fact, the perennial nature of Nepali rivers

and the steep gradient of the country's topography provide ideal conditions for the

development of some of the world's largest hydroelectric projects in Nepal. Current

estimates are that Nepal has approximately 40,000 MW of economically feasible

hydropower potential. However, the present situation is that Nepal has developed

only approximately 600 MW of hydropower. Therefore, bulk of the economically

feasible generation has not been realized yet.


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Hydrology

The hydrological study has been carried out based on the approved wateravailability series obtained from Department of Hydrology and Meteorology (DHM),

Nepal. Based on the hydrological and sediment study, the following conclusions and

recommendations were made in this level of study:

The 100 year design flood is 2040 m3/s at dam site and 2570 m3/s at

powerhouse TRT outlet site. Similarly the recommended design flood of 500

years return period for the dam site and powerhouse site are 2720 m3/s and

3400 m3/s respectively. The 1000 years return period flood for the dam site

and powerhouse site are 3060 m3

/s and 3800 m3

/s respectively.

The design discharge corresponding Q40 works out to be 60.6 cumec and

corresponding Q65 and Q50 works out to be 33.6 cumec and 46.8 cumec

respectively .The 90% dependable flow at the dam site is 23.8 cumec.

Hydrology of the Project has been worked out based on standard practices

being followed in Nepal. There may be some variations in the design

discharge / design flood / diversion flood if the same are worked out as per

practices prevailing in India

Geology

The Project lies in partly in the gritty phyllite and quartzite of the Ranimatta

Formation and partly in the quartzite of the Kushma Formation as well as the

dolomite of the Lakharpata Formation, Lesser Himalaya, Far Western Nepal.

The slope stability of the Project area is good. The dipping of the foliation

plane is opposite to oblique to the natural hill slope so favorable condition.

The spacing of the discontinuities range from 0.1 to 1 m, roughness and

waviness of discontinuities plane is rough and steeped, the joints are filled

with sandy clays

Project Description

The SR III HE Project is a run of the river scheme having a diversion structure inthe form of the Barrage at approximate river bed level at EL 1242.5 m (located on


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Seti River just downstream of the confluence of Seti River and Bauligad Nala). A

8850 m(tentative) long HRT and a pressure shaft of 460m(tentative)with a surface

power house at EL 1080 m(tentative) just upstream of Nanga Bagar village. This

scheme would utilize about 60.6 cumecs discharge with a gross head of 177.5m to

provide an installed capacity of 89 MW (tentative). The Project area is located

between 135 and 145 km northwest of Dadheldhura along the Khodpe-Chanipur

Road (also named as the Jaya Prithvi Bahadur Singh Highway).

Some of the Unique Featuresof the Project are as follows:

Seti River-III Hydropower Project was first identified during the screening and

ranking study conducted by Canadian International Water and Energy

Consultant (CIWEC) and Nepal Electricity Authority (NEA) in 1996.

An ordinary a hydrometric gauging station with vertical staff gauges had been

already established in the West Seti River at Chainpur (about 500 m

upstream from proposed dam site of this Project) by DHM since May 1990 to

collect daily water level and measure flow at different season at the proposed

dam site.

The height of Diversion structure is 12 m (tentative).

No Rehabilitation & Resettlement issues.

Very less submergence as this is a ROR scheme.

Hydrology favourable.

Project Status

The Project is at investigation stage.

PFR report has been prepared.

Topographical Survey completed.

Geological mapping and Geotechnical study completed.

Hydrology and Sediment study completed.

Site office has established.

.


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LOCATION MAP


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CATCHMENT AREA MAP


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PROJECT LAYOUT PLAN

Documents

SR 3 Status Report