VOLUME - I

MAIN REPORT

JULY 2014

A Joint Venture of:

Associated Consulting Engineers ACE (Pvt.) Ltd. 1 C/2, M. M. Alam Road, Gulberg- III, Lahore

Engineering General Consultants EGC (Pvt.) Ltd. 49/D-1, Gulberg-III, Lahore

Technical Engineering and Management Consultants Suit No.9, 4th Floor, Amaan Business Centre, Block H-3, Johar Town, Lahore

GAHRAIT-SWIR LASHT HYDROPOWER PROJECT

INDEX - FEASIBILITY STUDY REPORT

VOLUME I: MAIN REPORT

VOLUME II: EIA & SIA

VOLUME III: ANNEXURES

PART 1 OF 3

PART 2 OF 3

PART 3 OF 3

VOLUME IV: DRAWINGS

GAHRAIT-SWIR LASHT HYDROPOWER PROJECT

COMPOSITION OF MAIN REPORT (VOLUME I)

CHAPTER 0: EXECUTIVE SUMMARY

CHAPTER 1: INTRODUCTION

CHAPTER 2: SURVEY AND MAPPING

CHAPTER 3: HYDROLOGY AND SEDIMENTATION STUDIES

CHAPTER 4: GEOLOGY, GEO-TECHNICAL AND CONSTRUCTION MATERIAL

STUDIES

CHAPTER 5: SEISMIC HAZARD ASSESSMENT STUDIES

CHAPTER 6: PROJECT LAYOUT STUDIES

CHAPTER 7: PROJECT SIZING, OPTIMIZATION STUDIES AND POWER

SIMULATION

CHAPTER 8: DAM DESIGN STUDIES

CHAPTER 9: HYDRAULIC DESIGN STUDIES

CHAPTER 10: STRUCTURAL DESIGN STUDIES

CHAPTER 11: HYDRO-MECHANICAL STUDIES

CHAPTER 12: ELECTRICAL ENGINEERING STUDIES

CHAPTER 13: POWER EVACUATION AND TRANSMISSION STUDIES

CHAPTER 14: ENVIRONMENTAL IMPACTS ASSESSMENT (EIA) STUDY

CHAPTER 15: SOCIAL IMPACTS ASSESSMENT (SIA) STUDY

CHAPTER 16: CONSTRUCTION PLANNING AND COST ESTIMATES

CHAPTER 17: ECONOMIC AND FINANCIAL ANALYSIS

CHAPTER 18: NEED FOR DETAILED PROJECT PLANNING AND DESIGN STUDY

CHAPTER 19: CONCLUSIONS AND RECOMMENDATIONS

CHAPTER

0

EXECUTIVE SUMMARY

Feasibility Study Volume I, Main Report Gahrait-Swir Lasht Hydropower Project July 2014

| Version: Final | Feasibility Study Report - Final 0-1

0 Executive Summary

0.1 Introduction

This Chapter of the Report summarizes the findings of the Feasibility Study carried out for

the Project. According to the study, Gahrait-Swir Lasht Hydropower Project is marked to

have an installed power generation capacity of 377 MW against 340 MW as originally

estimated in the identification studies conducted earlier by GTZ. Accordingly, the Annual

Energy is now estimated as 1579 GWh against 1,553 Gwh indicated in GTZ Report. Salient

Features of the Project and Project Layout Plan are placed at the end of this Chapter.

All relevant desk and field studies including Field Investigations have been conducted as a

part of Feasibility Study. Geological, Environmental and Seismic Studies have not indicated

any major adversity that may challenge/threaten further development and construction of the

Project.

The Feasibility Report has been prepared by a Joint Venture of three local Consultants

including ACE, EGC and TEAM Consultants, ACE being the lead Consultant.

0.2 Project Location

Gahrait-Swir Lasht HPP is located on Chitral River which is the main river that passes

through Chitral Valley. It flows from north to south and enters Afghanistan near Arandu

Town. The dam site is proposed about 35 km downstream of Chitral Town. Powerhouse site

is located about 8 km downstream of Drosh Town near Swir Lasht Village on the right bank

of Chitral River.The national grid at Chakdara is at a distance of about 170 km from the

powerhouse site. Water from the dam will be conveyed through a 10 km long tunnel to an

underground power house, about 8 km downstream of Drosh town near Swir Lasht village.

0.3 Geological and Geotechnical Studies

Significant information about the geology of the project components / parts has become

available, based on which the feasibility of the project has been studied.

Results of Geological and Geotechnical Investigations carried out are presented in this

report and evaluation of the foundation conditions and the parameters established for use in

the design of various surface and underground structures, including the design of rock

excavations, have been defined. Generally the strength of the rocks are not likely to pose

any serious problem for the structures.

Certain Geotechnical Investigations remained outstanding due to various unavoidable

circumstances.Further geological and geotechnical investigations should be carried out at

the detailed design stage of the project.

0.4 Seismic Hazard Analysis

The project is located in a region which is seismically active due to the proximity of the

collisional boundary of the Indian and the Eurasian plates. The seismicity of the area is

depicted by small to major earthquake activity. The main active tectonic features within 100

km of the site, which govern the ground motion at the project site, are the Main Karakoram

Thrust (MKT), Reshun Thrust, Tirich Mir Thrust and the Hindukush Deep Seismic Zone.

Feasibility Study Volume I, Main Report Gahrait-Swir Lasht Hydropower Project July 2014

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The recommended PGA value for Safety Evaluation Earthquake (SEE) associated with

horizontal ground motions is 0.42g which has a return period of 3,000 years. The dam safety

critical features like dam body, bottom outlet and spillway gates are recommended to be

designed to maintain their integrity during shaking from SEE ground motions.

The PGA of 0.18g having a return period of 145 year is recommended for the project

structures to remain operative for horizontal ground motion associated with Operating Basis

Earthquake (OBE). All the appurtenant structures of the dam, tunnel and power house are

recommended to be designed for PGA of 0.26g which is associated with horizontal ground

motion of Design Basis Earthquake (DBE).

0.5 Optimization and Project Sizing

The Project is optimized with a maximum reservoir level of 1337m asl and design discharge

of 430 m3/s, which has availability approximately 26% time of year. Installed capacity of

377MW and Annual Energy equivalent to 1,579Gwh has been attributed to the Project with a

Plant Factor of 49%.

0.6 Environmental and Social Impact Assessment

Surveys and studies are indicative of Low-Adverse Impact resulting from implementation of

Gahrait-Swir Lasht Hydropower Project. All the impacts can be mitigated without difficulty.

0.7 Construction Planning

It is presumed that the construction of this Project shall be carried out as Engineering,

Procurement & Construction (EPC) Package. At this stage, Consultants have carried out an

exercise to establish broad outlines which identify the extent, viability and interdependence

of various activities involved in construction as shown in the Project Construction Schedule

given in Chapter-15 of this Report. The Project can be completed in a Period of 96 months,

out of which 12 months are for pre-construction activities and 84 months for construction.

0.8 Cost Estimate

Cost estimates of the Project are prepared on the basis of Feasibility Level Designs and

Drawings. Unit Rates of various items used for cost estimation are derived from rate

analyses.

Rates have also been obtained from suppliers / manufacturers wherever applicable. All rates

pertain to the year 2013 price level. While working out the cost of each Project component,

appropriate contingencies for Civil Works and E&M items have been included.

Total Project cost has been worked out as US$ 1,838 million or Rs.181,115 millionwhich also includes US$ 441.46 million as Interest during construction (IDC).

0.9 Economic and Financial Analyses

Economic viability of the Project has been determined using the Alternative Cost approach,

wherein the investment of Gahrait-Swir Lasht Hydropower Project is compared with the

investment of alternative thermal power plants.

EIRR in comparison with thermal plant of equivalent capacity is 23.71% in case of furnace

oil plant and 13.58 % in case of gas operated plant. Benefit-Cost Ratio in each of the two cases is 2.05 and 1.15 respectively.

Feasibility Study Volume I, Main Report Gahrait-Swir Lasht Hydropower Project July 2014

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To test the robustness of the Economic appraisal of the Project, a sensitivity analysis has

been carried out. This test has been performed only for the combined cycle plant (in case of

furnace oil) as this alternative has been compared with the proposed Project.

The above mentioned analysis has also been tested for its robustness for Cost increase of

10 % and Benefit decrease of 10%. The cumulative effect of the above two conditions gives

an EIRR of 19.75 % and B.C Ratio as 1.68 .Study of Certified Emission Rate (CER)

indicates a saving of emission of 757,920 tons of CO2 per annum compared to furnace oil

plants and 663,180 tons/annum if gas is considered as the alternative source of energy

Financial Analysis has indicated B.C Ratio greater than one (1). It is also seen from the

Financial Analysis that repayment of the loan installments will be easily manageable.

SALIENT FEATURES

377 MW GAHRAIT-SWIR LASHT HYDROPOWER PROJECT

SALIENT FEATURES

1. Location 10 km upstream of Drosh Town. (District

Chitral), Khyber Pakhtunkhwa, Pakistan.

2. Organization Pakhtunkhwa Hydel Development

Organization (PHYDO).

3. Hydrology

Catchment area (dam site) 13418.5 km2

Mean Monthly Discharge (m3/sec) 80.8 to 978.50

Design Flood (Q1000) 3538 m3/sec

4. River Diversion Design Flood (Q10 year) 1790 m

3/sec

No of Diversion Tunnels 4 Nos.

Shape D-shaped

Size (W x H) 7.6 m x 7.6 m

5. Dam & Appurtenant Structures Dam type Asphaltic face Rockfill Dam (AFRD)

Dam Crest level 1342.00 masl

Maximum Reservoir Level 1337.00 masl

Minimum Reservoir Level 1331.00 masl

Dead Storage Level 1324.00 masl

Dam Height (from Bed) 34 m.

Dam bed elevation 1309.00 m.asl

6. Spillway & Energy dissipation arrangement

Spillway type Tunnel Spillway No of Diversion Tunnels 4 Nos.

Shape D-shaped

Size (W x H) 7.6 m x 7.6 m

Type of energy dissipation arrangement Flip Bucket

7. Power Intake/ Connecting Tunnels No of Intakes 4 Nos.

Size of each Twin intake opening 7.00 m x 3.00 m

Intakes invert Level 1324.00 m.asl.

No of Intake Connecting tunnels 4 Nos

Connecting Tunnels (Upstream of Sand trap) 12 m x 9 m (D-Shaped)

8. Sand Trap / Flushing Tunnels Type Pressurized-D shape

No of chambers 4 Nos

Length of Chamber 525 m.

Fall velocity 0.2 m /sec

Size of Chamber (W x H) 14.30 m x 20.30 m

Flushing Discharge 86 m3 /sec

No of Main flushing tunnels 2 Nos

9. Headrace Tunnel

Type Horseshoe

No of Headrace tunnels 2 Nos

Average Length 10,214 m

Diameter 9.50 m

10. Surge Shaft

Height 71 m.

No of Surge Tanks 02 Nos

Diameter 10 m.

11. Concrete Lined Pressure Shaft

Length 92.20 m.

No of Pressure Shafts 02 Nos

Diameter 6.50.m.

12. Steel Lined Penstock

Length 78 m.

Diameter 6.5 m.

13. Head

Gross head 109.28 m.

Head loss (single waterway) 9.12 m

Net Head 100.16 m

14. DischargeDesign Discharge 430 m

3/sec

15. Powerhouse

Type Underground

Size (Lx WxH) 113 m x24 m x35 m

16. Tailrace Tunnel

Type D-Shaped

Total length 3980 m

Size (W x H) 7 m x 6.5m

17. Hydro-Mechanical Equipment

Type of turbine Francis

No of Units 4 Nos

Discharge/ Unit 107.50 m3/sec

18. Electrical Equipment

Generators 4 Nos

Speed 176.5 rpm

19. Installed Capacity

Plant Capacity 377 MW

Capacity/ unit 94.25 MW

20. Energy

Annual Energy 1579 Gwh

Plant Factor 49%

21. Project Cost (with transmission line)

Base Cost 110,737 M.Rs

Total Project Cost 181,116 M.Rs

22. Economic and Financial Analysis

B/C ratio 2.05

EIRR 23.71

FIRR 13.58 %

Cost/MW 4.874 M.US$ Construction time 84 months

IST PARTTable 14.293RD PART

Version Final: Feasibility Study Report Final: Version Final_2: Feasibility Study Report Final_2: