SOLU KHOLA (DUDHKOSHI) HYDROELECTRIC …sahasurja.com/wp-content/uploads/2018/01/Progress-Report...East-West highway to Ramite through Katari-Ghurmi-Okhaldhunga which is 149 km in

SOLU KHOLA (DUDHKOSHI) HYDROELECTRIC PROJECT (86MW)

Progress Report # W05 (Aug2017-Nov2017)

Submitted by:

Sahas Urja. Ltd. (SUL) Hattisar, Kathmandu, Nepal

December2017

Sahas Urja Ltd. Progress report of SKDKHEP # WO5

Table of contents

Chapter 1 About the Company ........................................................................................... 1

1.1 Description of the Company ............................................................................. 1

1.2 Board of Directors.............................................................................................. 1

1.3 Organization Structure ..................................................................................... 2

Chapter 2 Project Description ............................................................................................ 3

2.1 Project Background ........................................................................................... 3

2.2 Project Location and Accessibility ................................................................... 3

2.3 Salient Features .................................................................................................. 4

2.4 Summary of Previous Works ............................................................................ 6

2.5 Summary of Recent Works ............................................................................... 8

Chapter 3 Work Progress in Detail .................................................................................... 9

3.1 Pre-construction and Infrastructure Works ................................................... 9

3.2 Civil Works ....................................................................................................... 19

3.2.1 Construction Progress ........................................................................................ 21

3.3 Hydro-Mechanical Works ............................................................................... 21

3.4 Electro-Mechanical Works ............................................................................. 21

3.5 Transmission Facilities .................................................................................... 22

Chapter 4 Other Works Related to the Project ............................................................... 23

4.1 Equity Management......................................................................................... 23

4.2 Construction Planning and Scheduling ......................................................... 23

4.3 Human resources ............................................................................................. 26

Chapter 5 Some additional photos.................................................................................... 27

November 2017 i

Sahas Urja Ltd. Progress report of SKDKHEP # WO5 List of Figures

Figure 1 Organizational structure .............................................................................................. 2

Figure 2.Causeway at Road A ................................................................................................. 10

Figure 3. Road A upgradation .................................................................................................. 10

Figure 4. Road B new track opening ....................................................................................... 11

Figure 5. Road B track opening ............................................................................................... 11

Figure 6. Road C track opening completed ............................................................................. 11

Figure 7. Road C track opening works .................................................................................... 11

Figure 8. Dry wall works at road D ......................................................................................... 11

Figure 9. Road D track opening ............................................................................................... 11

Figure 10. Gabion work at Road F near Bhorleni School........................................................ 12

Figure 11. Gabion structure at road F ...................................................................................... 12

Figure 12. Bridge 2 location .................................................................................................... 13

Figure 13. Drilling of holes for bridge 2 foundation .............................................................. 13

Figure 14. Land scaping at headworks area ............................................................................. 14

Figure 15. Retaining structures at headworks office area ........................................................ 14

Figure 16. Construction of Drivers quarter at headworks area ............................................... 14

Figure 17. Retaining wall under progress at headworks camp are .......................................... 14

Figure 18. Transmission line route in google map .................................................................. 15

Figure 19. Initial headworks model ......................................................................................... 15

Figure 20. Initial headworks Model ......................................................................................... 15

Figure 21. Revised headworks model 1 ................................................................................... 16

Figure 22. Revised headworks model 1 ................................................................................... 16

Figure 23. Revised model with settling basin .......................................................................... 16

Figure 24. Settling basin model in progress............................................................................. 16

Figure 25. Settling basin Model ............................................................................................... 16

November 2017 ii

Sahas Urja Ltd. Progress report of SKDKHEP # WO5 Figure 26. Complete headworks model ................................................................................... 16

Figure 27. Landscaping work by EPC contractor for camp construction ................................ 17

Figure 28. Landscaping work at headworks area in progress .................................................. 17

Figure 29. Geologist team of CMC at site ............................................................................... 17

Figure 30. Geological mapping work by geologists ................................................................ 17

Figure 31. Vetiver plantation at Bhadaure area ....................................................................... 18

Figure 32. Vetiver plantation ................................................................................................... 18

Figure 33. Bio-engineering work at Road A ........................................................................... 18

Figure 34. Vetiver plantation work in progress ....................................................................... 18

Figure 35. Ramite road upgradation works (widening) ........................................................... 19

Figure 36. Kagel road Upgradation ......................................................................................... 19

Figure 37. Construction Schedule ............................................................................................ 25

Figure 38. EPC contractor’s staff in site investigation ............................................................ 27

Figure 39. Geological mapping work ...................................................................................... 27

Figure 40. Bio-engineering work at headworks area ............................................................... 27

Figure 41. Camp construction at headworks ............................................................................ 27

Figure 42. Site visit by board members ................................................................................... 27

Figure 43. Site visit with CMC team ....................................................................................... 27

Figure 44. Camp area of EPC Contractor ................................................................................ 28

Figure 45. Road upgradation work .......................................................................................... 28

Figure 46. Aggregate collection work at site ........................................................................... 28

Figure 47. Track opening work at Road B area ....................................................................... 28

Figure 48. Track opening at Road C area ................................................................................ 28

Figure 49. View of headworks area From Kagel area ............................................................. 28

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List of tables Table 1 Company details ........................................................................................................... 1

Table 2. Board of Directors ....................................................................................................... 1

Table 3 Salient features .............................................................................................................. 4

Table 4 Summary of activities completed till July 2017 ........................................................... 6

Table 5. Summary of recent activities ....................................................................................... 8

Table 6: List of Access Roads of Project. ................................................................................ 10

Table 7. List of roads constructed for society .......................................................................... 19

Table 8. Road Structures at Social roads ................................................................................. 19

Table 9. Total project cost ....................................................................................................... 23

Table 10. Equity Management ................................................................................................. 23

Table 11. Participating Banks and Investment Company with percentage financing ............. 23

Table 12. Human resources ...................................................................................................... 26

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Chapter 1 About theCompany

1.1 Description of the Company Sahas Urja Ltd. established on 2071 B.S comprises of a group of veterans in the field of entrepreneurship having innovative ideas of modern enterprises with advanced development strategies and management concepts. Sahas Urja Ltd. commits to create superior value for all its shareholders and stakeholders and aimed to be among most admired and trusted company in the country. It has planned to contribute to the national economy through accelerated hydropower development.

Table 1 Company details

Company Sahas Urja. Ltd. Type Public Limited Company Address Hattisar, Kathmandu Establishment 2071/05/29 B.S. PAN no 601799749 Kathmandu Registration no. at Office of Company Registrar

126624/071/072

Department of Industry Registration No 2117/77/070/071 (2070-06-10) Project under development Solu Khola (Dudh Koshi) Hydroelectric Project-86 MW

Survey license no. BBB 065/066 B U S-435 Generation license no BBB 71/72-B U. 126 Generation License date May 15th 2017, 2074/2/1

1.2 Board of Directors Table 2. Board of Directors

Name Position Mr. Him Prasad Pathak Chairman Mr. Min Raj Kadel Director Mr. Paritosh Paudyal Director Mr. Mahendra Kumar Giri Director Mr. Bhoj Bahadur Shah Director Mr. Mukti Ram Pandey Director Mr. Sushil Thapa Director

November 2017 1


1.3 OrganizationStructure In any organization, the organizational structure plays a vital role in achieving the success. This structure defines the role of each persons involved in the company. Following chart elaborates the organization structure of this company:

Figure 1 Organizational structure

Both site team and head office team will have a technical division and support division. Whereas the head office team comprise of finance division and site team has public relation division.

Board

Chairman

Project Manager

Site Team

Technical Division

Support Division

Public Relation & Environment

Head Office Team

Technical Division

Finance Division

Support Division

Advisor

November 2017 2


Chapter 2 Project Description

2.1 Project Background

Solu Khola (Dudh Koshi) Hydroelectric Project (SKDKHEP) is a Run of River (RoR) type project with installed capacity of 86 MW that lies in Solukhumbu District of Sagarmatha Zone in the Eastern Development Region of Nepal. The Project was identified by Hydro Venture Pvt. Ltd (HVPL) in 2008. The proposed headworks site is located near Bhadaure Village in Necha- Salyan Gaupalika. The tunnel passes underneath of Kattike, Gairi, Pokhari Bhanjyang, Phalate and Pairatham of Dudh Kaushika Gaupalika. The proposed powerhouse site is located at Maikubesi of Dudh Kaushika Gaupalikaat about 1km upstream from the suspension bridge over Dudh Koshi River at Jaleshwor Mahadev. The major structures of the project are diversion weir, undersluice, intake, approach canal, surface settling basin, headrace tunnel, surge tunnel, underground penstock, surface powerhouse and tailrace box culvert. The energy generated from the project will be evacuated to the Integrated Nepal Power System (INPS) at the proposed sub-station at Lamane in Necha- Salyan Gaupalikaof Solukhumbu District. Geographically, the physical area of the project lies within longitudes of 86°37′35″E to 86°41′15″E and latitude of 27°21′53″N to 27°25′15″N.

DoED had awarded the survey license to the company on 2065-07-25 to conduct the necessary investigations, feasibility study and environmental impact assessment (EIA) of the project. Upon completion of feasibility study and EIA of the project in October 2013, Hydro Venture applied for the generation license with the DoED and presented among the concerned officials. DoED accordingly awarded the Generation License to HVPL on 2071-06-02 (18 September 2014).

The application for PPA was filed in February 2012 and regular follow ups were made with the Power Trade department of NEA. After the introduction of new tariff structure for projects up to 100 MW, PPA between HVPL and NEA was concluded on 25 February 2015.

The Financial Closure has been concluded with 11 Banks and Financial Institution with the lead by Nepal Investment Bank Limited (NIBL) on 2073/4/20. HVPL was involved in acquisition of private land and development of infrastructures like access road and camp facilities of the Project till 23rd Chaitra 2073.

2.2 Project Location and Accessibility

The proposed headworks site lies at an elevation of 1255.0 m near Gairi Gaunof Tinla of Necha- Salyan Gaupalikaand the powerhouse is located at an elevation of 660 m at Maiku Besi of Dudh Kaushika Gaupalika.

The nearest motorable road head from the headworks site is at Ramite on Sagarmatha highway from where an agricultural road branches towards SKDKHEP headworks site. The Headworks site is about 257 km from Kathmandu including 250 km black topped road up to Ramite and 7

November 2017 3

Sahas Urja Ltd. Progress report of SKDKHEP # WO5 km earthen road from Ramite to headworks site. Similarly, there is accessibility from Mirchiya, East-West highway to Ramite through Katari-Ghurmi-Okhaldhunga which is 149 km in length.

Similarly, the nearest road head from the powerhouse site is Panchan which is 19 km from Jorbuddha, Okhaldhunga- Salleri highway.

2.3 Salient Features

The salient features of the project are listed below:

Table 3 Salient features

S.N. Components Description 1 Project Location Solukhumbu District, Sagarmatha Zone

Intake Site Necha- Salyan Gaupalika

Powerhouse Area Dudh Kaushika Gaupalika

Latitude 27°21’53”N to 27°25’15”N

Longitude 86°37’35”E to 86°41’15”E 2 General

Name of River Solu Khola

Type of Scheme Run-of-River

Gross Head 613.20 m

Net Head 598.09 m

Installed Capacity 86,000 kW 3 Hydrology

Catchment Area 454 km2

Design Discharge 17.05 m3/s

Design Flood Discharge 475 m3/s (100 Yr. Flood) 4 Diversion Weir

Type of Weir Gravity free flow concrete

Length of Weir 31.8 m

Max. Height of Weir 7.4 m from foundation level

Crest Elevation EL. 1,260.5 masl 5 Intake Structure

Type 4 no.s of Side intake

Size (W x H) 2.80 m (W) x 2.30 m (H)

Crest elevation of Intake EL. 1,257.6 masl 6 Undersluice Structure

Type 2 sets of Radial Gate

Size (W x H) 2.00 m (W) x 3.00 m (H)

Crest elevation of Undersluice EL. 1,254.6 masl 7 Gravel Trap

Type Rectangular, RCC

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Sahas Urja Ltd. Progress report of SKDKHEP # WO5 S.N. Components Description

Size 6.15m (W) x 6.6 m (L)

Bed load size to trap 5 mm 8 Approach Canal

Type and Number Free flow box culvert, total 4 nos

Size 2.2 m x 2.2 m 9 Desanding Basin

Type Surface No of Bays 4 Nos

Dimension (L x B x H) m 85 m (L) x 9.5 m (W) x 4.5 m (H) Effective

Particle Size to be Settled 0.15 mm (90% trapping efficiency)

Outlet Water Level EL. 1,260.35 m 10 Headrace box Culvert

Length 50.0 m

Size 4.5m (W) x 4.5m (H) Numbers 1 (One) 11 Headrace Tunnel Section Type Inverted-D Length 4,259.0 m Size 4.0m (W) x 4.25m (H)

Support Shotcrete 11 Surge Tunnel

Size 4.0m x 4.0m of 372.0m length in slope 12 Penstock Length upto Trifurcation 2098.0 m Horizontal section before Drop Shaft 1 20.0 m Drop Shaft-1 226.0 m Inclined Section 1 717.0 m

Drop Shaft-2 201.0 m

Inclined Section 2 934.0 m

Internal Diameter and length 2.35 m for 1st 1130 m length, 2.25m for next 551m length and 2.1m for 417 m length (last portion)

Thickness of steel penstock 10 mm ~ 44 mm with yield strength 450MPA 13 Powerhouse

Type Surface

Size 54.6 m x 16.2 m x19.45m 14 Tailrace

Type Free Flow, Box Culvert

Length 70 m

Size (B x H) 4.6 m x 1.9 m

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Sahas Urja Ltd. Progress report of SKDKHEP # WO5 S.N. Components Description 15 Turbine

Type Vertical Axis Pelton

Speed of Turbine 600 RPM

Rated Output Capacity per Unit 3 x 30.32 MW with 10% COL

Efficiency 91% 16 Governor

Type Digital/Hydraulic with PID Control

Adjustment for Speed Drop Between 0 to 5 % 17 Generator

Type Synchronous 3 Phase

Rated Output Capacity per Unit 34.6 MVA

Voltage 11 kV

Efficiency 97% 18 Transformer

Type Out Door, Oil Immersed

Rated Capacity per Unit Three Phase 35 MVA total Nos 3

Frequency 50 Hz 19 Transmission Line

Length 10.5 km

Voltage 132 KV

Interconnection Point Proposed NEA sub-station at Tinla (Lamane) Solu 20 Power and Energy Generation Mean annual energy per year 520.20 GWh (Dry- 100.27 GWh, Wet- 419.93 GWh)

2.4 Summary of Previous Works

Various activities have been completed since the survey license was awarded to the company. Table 4presents the summary of these activities and progress of the project tillJuly 2017.

Table 4 Summary of activities completed till July 2017

SN Activities Dates

1 Award of Survey License by DoED. Nov-2008

2 Application for Power Purchase Agreement to NEA. Feb-2012

3 License Capacity Upgrade to 86 MW by DoED. Aug-2012

4 Connection Agreement with NEA. Jan-2013

5 EIA Study completed. Jan to Oct 2013

6 Registration at Department of Industry as Hydro Venture Ltd. 26 Sept 2013

7 Application for Generation License to DoED. Oct-2013

8 Award of Generation License by DoED. Sept. 2014

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Sahas Urja Ltd. Progress report of SKDKHEP # WO5 SN Activities Dates

9 Conclusion of PPA with Nepal Electricity Authority. 25 Feb 2015

10 Application of survey license for transmission line to DoED. June 2015

11 Contract agreement for Detail Design & Tender Document preparation with

Hydro Consult Engineering Limited.

Nov 2015

12 Extension of time for Financial Closure by DoED. Dec 2015

13 Application for debt financing to the Nepal Investment Bank Limited to lead

the consortium of the financing institutions. Feb 2016

14 Start of Construction of Access road by Radha Krishna and Brother

Construction Pvt. Ltd. Mar 2016

15 Agreement with Geophysical Research and Consultancy Service Pvt. Ltd for

geophysical investigation works. April 2016

16 Agreement with ICGS Pvt. Ltd for core drilling works. April 2016

17 Report submission of Geophysical Investigation. May 2016

18 Award of Survey license for Transmission Line by DoED. May 2016

19 Agreement for river and hydraulic modelling with Hydro Lab Pvt. Ltd. May 2016

20 Agreement with Integrated Engineering and Management Group for the

supply of Explosive.

July 2016

21 Agreement with Nepal Environment and Development Consultant Pvt. Ltd.

(NEDC) for IEE study of transmission line works. July 2016

22 Financial Closure Concluded between HVPL and Consortium of 11 Banks

andFinancial Institution with the lead by Nepal Investment Bank Limited.

Aug 2016

23 Agreement with Rex Prefab for construction of camp phase 2. Aug 2016

24 River Validation at Hydro Lab. Nov 2016

25 Camp at Bhorleni near Adit-2 completed. Nov 2016

26 Track opening of access road till bridge 1 completed. Nov 2016

27 Track opening of access road till Powerhouse completed. Dec 2016

28 Amendment of PPA for revised RCOD (Sept 26, 2020). Dec 2016

29 Final ToR for IEE of Transmission line submitted after incorporation of

comment. Feb 2017

30 Bailey Bridge Components of both Bridges Received at site April 2017

31 Registration in Department of Industry as Sahas Urja Limited. April 2017

32 Generation License transferred by DoED to Sahas Urja Limited. May 2017

33 Operation of Headworks camp started May 2017

34 Construction of superstructure of camps at headworks and powerhouse June 2017

November 2017 7

Sahas Urja Ltd. Progress report of SKDKHEP # WO5 SN Activities Dates

completed.

35 EPC Contract agreement signed with Cooperativa Muratori & Cementisti –

C.M.C di Ravenna (Italy). June 2017

36 Installation of Bailey Bridge 1 is complete. June 2017

37 Survey work by CMC at site July 2017

38 NEA PPA transfer July 2017

39 Application for license transfer of Transmission line July 2017

2.5 Summary of RecentWorks

Similarly, the activities of the project during this reporting period i.e. from August2017 to November2017are listed below inTable 5;

Table 5. Summary of recent activities

S.No. Activities Dates 1 Survey License of Transmission line transferred in the name of Sahas Urja Ltd. August 2017 2 Detail Design Report submitted by Consultant. September 3 Land purchase limit approval obtained. September 4 1st phase Vetiver plantation work completed (bio-engineering). September 5 Completion of track opening at Road C. September 6 TOR for IEE for transmission line Approved. September 7 Contractor’s mobilization at site October

8 Contract agreement with the Department of Forest regarding tree cutting and land use

November

9 Operation of Powerhouse camp started November 10 Track opening at Road B. Ongoing 11 Minor modification on headworks at Hydro Lab Pvt. Ltd. Ongoing 12 Excavation of Bridge 2 Foundation. Ongoing 13 EPC Contractors camp construction work. Ongoing 14 Upgradation of existing access road. Ongoing

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Chapter 3 Work Progress in Detail Moreover, the company has almost completed the preparation for the next phases i.e. Construction works of the project. Construction of employer’s camp has been completedwhile upgradation of access road construction is ongoing.Construction of Bailey Bridge 1 has been completed and Bailey Bridge 2 foundation work is in progress.

Engineer, Procure Construct (EPC) contract has been awarded to the Italian company, Cooperativa Muratori & Cementisti – CMC di Ravennaon 9th June 2017 after negotiation on technical, commercial and price on the offer submitted. This contract contains the components like civil, hydromechanical and electromechanical components. The contractor has been mobilized at site.

The works in this project is divided as follows:

A. Pre-construction and Infrastructure works B. Civil works C. Hydro-mechanical works D. Electro-mechanical works E. Transmission facilities

3.1 Pre-construction and Infrastructure Works

This topic covers the works required to be completed before the major construction work starts. Following topics are covered by this topic and described in detail

i. Land Acquisition

Based on different types of ownership, there are two types of lands required by the project i.e. governmental and private. Within this frame these lands are either leased till the project period or purchased.Most of the Private land required for the project component has already been purchased and taken in lease and few are in the process.

Application for the lease of Government Land has already submitted to the respective office along with the permission of tree cuttings. Site visit by the representative of District Forest Office and Survey Offices has been completed. Final report from District Forest Office to the Department of Forest is in final stage.

From the Ministry of Land Reform and Management approval for acquisition of 239 Ropani of land was obtained in the month of September.

ii. Access Road

The access road from headworks to powerhouse is about 21.71 km. and crosses the Solu River two times. The road length from Ramite (nearest road head in Okhaldhunga- Salleri highway) to headworks is 9 km.Track road connecting Bridge-1 and Bridge-2 is ongoing. Foundation

November 2017 9

Sahas Urja Ltd. Progress report of SKDKHEP # WO5 excavation for bridge 2 is in progress. Details of access road track opening is listed in Table 6. At the same time,upgradation of access road is ongoing at different sections.

Table 6: List of Access Roads of Project.

S. N. Name of the

Road From-To Total Length (km) Track opened till

date (km) 1 Road A Zero (Bhadaure)- Bridge 1 at Headworks 2.500 2.500 2 Road B Mayalu Odar- Bridge 2 1.540 1.500 3 Road C Bridge 2- Thulodhunga 1.946 1.946 4 Road D Thulodhunga – Panchan Bhanjyang 6.502 6.502 5 Road E Panchan Bhanjyang – Bhorleni Site camp 2.120 2.120 6 Road F Bhorleni site camp- Powerhouse 6.803 6.803 7 Road G B1- Headworks 0.300 0.300

Total 21.711 21.671

Less than 0.05 km of track road excavation connecting the headworks with powerhouse is left. While, the powerhouse is currently accessible via Salleri-Nele-Panchan Road or Jorbauddha- Nele -Panchan. Salleri-Nele section is currently being upgraded by ADB funded project. From Panchan onwards Road E will be used to access Maikhu Besi i.e. Powerhouse location.

At various locations road upgradation activities are ongoing.Till November, approximately 5730

m3 of gabion works, 246 m3 of dry wall and 300 m3 of stone masonry works has been executed at site.Figure 2and Figure 3shows the access road with structures at Road A sections.

Figure 4and Figure 5shows the ongoing track opening work at sections of road B. Similarly, Figure 6andFigure 7illustrates the track opening at Road C sections.

Figure 2.Causeway at Road A

Figure 3. Road A upgradation

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Figure 8shows the dry wall works in progress and Figure 9shows the section of the upgraded road. Similarly,Figure 10 and Figure 11shows the sections of road F.

Figure 4. Road B new track opening

Figure 5. Road B track opening

Figure 6. Road C track opening completed

Figure 7. Road C track opening works

Figure 8. Dry wall works at road D

Figure 9. Road D track opening

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Figure 10. Gabion work at Road F near Bhorleni School

Figure 11. Gabion structure at road F

iii. Bailey Bridge

Twobridges are planned Bridge-1 to access the headworks and Bridge-2 to connect headworks and powerhouse in Solu Khola. Bridge -1 and Bridge-2 are of 30 R and 70R capacity in accordance to Road Standards respectively. The span of these bridge is 120 feet.A factory inspection for these bridges were made on February 2017. All the components for both the bridges have been delivered at site.

Bridge 1

Construction of Abutments with installation of Bailey Bridge -1 completed on June 2017.The abutment at the right bank is of 8m height whereas in the left bank a concrete pad was casted on top of the rock base.

Bridge 2

Construction of Bailey bridge 2 is in progress and will be completed in few months period. There will be concrete pads on both banks for Bridge 2 as the foundation of these pads are on rock surface. The hard rock excavation at left bank is recently completed.Figure 12shows the excavation progress at bridge 2 area Figure 13 shows the drilling of holes for bridge 2 foundation.

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Figure 12. Bridge 2 location

iv. Camp and Other Facilities

The construction of Employers’ camp at headworks area at Bhadaure, surge tank area at Bhorlini and powerhouse area at Maikhu Besi is completed except some finishing works.

There are five building blocks planned at headworks. Two for residential quarters for senior officers, one for driver and guard room, one kitchen and one office building. The residential quarters are ready and is being used for accommodation at site since May 2017. Office building along with admin site office has been set up at headworks. Whereas, some components like driver’s camp, and minor finishing is left. Figure 14, Figure 15Figure 16and Figure 17shows the overall progress of headworks camp facilities.

There are five blocks at powerhouse with three senior residential quarters, one office block and one kitchen block. Residential quarters are ready and is being used for accommodation from this November. Fencing work around the camp area, landscaping and some other furnishing work are still remaining at powerhouse area.

Figure 13. Drilling of holes for bridge 2 foundation

November 2017 13

Sahas Urja Ltd. Progress report of SKDKHEP # WO5 The camp facilities include furniture, mesh utensils, office equipment’s etc. Most of the facilities are available at site. Intercom and internet setup are still going.

v. Detail Design Report (DDR)

Hydro Consult Engineering Limited (HCEL) the consultant has submitted Detail Design Report (DDR) of the project with construction drawings on the month of July 2017.

vi. Transmission Line Route Survey

A transmission line walkover survey report has been submitted by the consultant. Along with this, a detail topographical survey has been completed by the consultant. DPR report consists of detail design of transmission line components.

Figure 14. Land scaping at headworks area

Figure 15. Retaining structures at headworks office area

Figure 16. Construction of Drivers quarter at headworks area

Figure 17. Retaining wall under progress at headworks camp are

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Figure 19. Initial headworks model Figure 20. Initial headworks Model

Figure 18. Transmission line route in google map

vii. Physical Modelling

Based on the site visit survey a physical model of the river was build and this river model has been validated. The test of the physical model with structure has been completed, based on the performance of the physical modelling, some minor modification of headworks is ongoing. The headworks model has been revised as per the suggestion from Professor Dr. Haakon Stole. The new model will also contain the settling basin as a part of headworks modelling.The photograph of model test is shown below Figure 19,Figure 20, Figure 21, Figure 22 ,Figure 23,Figure 24, Figure 25 and Figure 26.

November 2017 15


Figure 21. Revised headworks model 1

Figure 22. Revised headworks model 1

Figure 23. Revised model with settling basin

Figure 24. Settling basin model in progress

Figure 25. Settling basin Model

Figure 26. Complete headworks model

November 2017 16

Sahas Urja Ltd. Progress report of SKDKHEP # WO5 viii. Contractor’s Mobilization

Contractor’s team is at site since October 2017. The Project Manager and Construction Manager along with other supporting staffs were initially mobilized. Currently, Camp construction team and survey team are also mobilized, and the camp construction work is in progress at headworks and powerhouse area.Figure 27 and Figure 28 shows the progress of camp construction work of EPC contractor.

Figure 27. Landscaping work by EPC contractor for camp construction

Figure 28. Landscaping work at headworks area in progress

ix. Geological and topographic survey

Geological and topographic survey team surveyed the site and they have started their planning for initial mobilization. After the survey and geological mapping design work will start.

Figure 29. Geologist team of CMC at site

Figure 30. Geological mapping work by geologists

November 2017 17

Sahas Urja Ltd. Progress report of SKDKHEP # WO5 x. Bio-Engineering

To protect the freshly cut slopes bio-engineering works was initiated at Bhadaure (headworks Paire area) as a first phase. There are many plants used in bio-engineering methods. The site visit by bio-engineering expertsuggested Vetiver as the suitable plant with respect to topography, geology and altitude. This season, 11,000 vetiver saplings were planted in Road A at Bhadaure area.Figure 31,Figure 32, Figure 33and Figure 34shows some clips of bio engineering method applied for freshly cut slope stabilization.

Figure 31. Vetiver plantation at Bhadaure area

Figure 32. Vetiver plantation

Figure 33. Bio-engineering work at Road A

Figure 34. Vetiver plantation work in progress

xi. Social Works

During the period of July toNovember 2017, social activities were performed in Ramite and Kangel and Panchan area. One of the major social activity in this period was upgradation of village road from Ramite to Surge tank of LSHEP on the request of public people.The upgradation of Ramite road is shown inFigure 35.Besides that the maintenance of village road from Tumse to Panchan was completed during this period which is shown inFigure 36. Village road at Maikhu besi to old suspension bridge was also upgraded on the request of

November 2017 18


local people. The status of upgradation work for Ramite road and Maikhubesi is enlisted inTable 7. Other works under social activities includes the following works as enlisted inTable 8.

Table 7. List of roads constructed for society

S.N Road Description Total length(km) Track upgrading(km)

1 Ramite to Surge tank of LSHEP(82mw) 2.5 0.7

2 Maikhubesi to old suspension bridge 0.7 0.7

Table 8. Road Structures at Social roads

3.2 Civil Works Total civil works is sub-divided into surface and underground structures. Surface structures include the weir, intake, gravel trap, approach canal, settling basin, powerhouse and switchyard whereas headrace tunnel, surge shaft and penstock shaft lies in underground structures.

i. Surface Structures

Headworks

The diversion weir is a gravity weir of 31.80 m long crest with horizontal floor stilling basin. The weir is designed by taking the advantage of side rock slope on the right bank of the river. The weir

S.N Structures Unit Quantity Remarks

1 Gabion wall m3 847 Completed 2 Dry wall installation m3 37.24 Completed 3 Stone soling m3 52.18 Completed

Figure 36. Kagel road Upgradation Figure 35. Ramite road upgradation works (widening)

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Sahas Urja Ltd. Progress report of SKDKHEP # WO5 crest is fixed at 1260.50 masl and invert level of intake at 1257.50 masl to divert the design discharge of 17.05 m3/sec with additional 15% for gravel trap and settling basin flushing. The head over the weir crest during 1 in 100 years flood, which is equivalent to 470.0 m3/s, is calculated to be about 3.6 m, which means that the maximum water level will be at 1264.10 masl considering the one undersluice gate opening. A low head Undersluice with two gates is proposed on the left side of the diversion weir beside intake for conventional hydraulic flushing of bed load.

A RCC side intake is proposed as the submerged orifice type intake, located immediately upstream and adjacent to the bed load sluice to withdraw the design discharge of 17.05 m3/s including the discharge for the flushing. The invert level of the intake is fixed at 1257.60 masl that the boulder up to 300 mm is allowed to enter through the trash rack of intake and can be flushed back to the river downstream through gravel trap flushing.The intake will have 4 orifices each 2.3 m high and 2.8 m wide. In front of the intake opening, a coarse trash rack of 300 mm c/c passage gap is placed which covers the span for two openings.

Two hopper shaped gravel trap of 6.15 m width and 6.6 m height each is provided immediately after intake chamber to trap coarse particles of size greater than 5 mm. The slope of hopper along the profile starts from 1 m D/S of inlet gate.Immediately after gravel trap, four individual approach culverts having different length, horizontal bends and slopes are provided to carry the design discharge up to the settling basin. The shape of the culvert is square with dimension 2.2 m * 2.2 m.

A hopper type buried settling basin with four chambers is proposed on the left bank of Solu Khola. Each chamber is 85 m long, 9.5 m wide with effective depth of 4.5 m.To collect water from kholsi, drainage arrangement has been made at the hill side. The water from kholsi in the main settling area is collected through cascade drop which diverts water to D/S and U/S side by earth fill slope to the main drain canal. It is a trapezoidal concrete channel of base width 2.5 m and height 1.75m designed to carry the discharge of 15.21 m3/s.

Powerhouse

The proposed powerhouse is located at rock on the right bank of the Dudh Koshi few meters above the high flood level of the 100 years return period The elevation of the powerhouse was fixed such that it is free from the risk of flooding at the Dudh Koshi River during the monsoon season. To ensure safety, flood protection wall near the powerhouse is also designed along the right bank of Dudh Koshi River.The powerhouse is 54.6 m long, 16.2 m wide and 19.45 m high with reinforced concrete structural elements in the main building with shear walls, brick walls, aluminum composite panels (ACP) and CGI sheet roofing.

A 70.0 m long tailrace culvert with sectional dimension 2.00 m wide and 1.90 m high for separate unit, 4.60 m wide and 1.9 m high for combined unit and 3.55 m wide and 1.9 m high for section between first and last merge point will pass the design discharge to the Dudh Koshi river at right bank of the river.

ii. Underground Structures

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Sahas Urja Ltd. Progress report of SKDKHEP # WO5 Headrace tunnel has been proposed as a low pressure tunnel from the surface settling basin to the surge tank. The total length of the headrace tunnel is 4259.0 m. An adit tunnel of 98 m length is proposed at 200m downstream from the inlet portal. Similarly, outlet adit tunnel of length 375 m is proposed before the surge tunnel. Headrace tunnel has been proposed as a lowpressure tunnel from the surface settling basin to the surge tank. However, the size of the tunnel is taken as 4m width and 4.25 m height considering the required height for the vehicle movement and for the provision of the ventilation.

The dimension of surge tunnel is 4.0 x 4.0 m with a slope length of 372.0m. The surge analysis shows the maximum surge level is 1272.28masl and maximum down surge level as 1246.78masl.

3.2.1 Construction Progress

i. Explosive

Approval for the procurement, supply, storage of explosives and blasting works have been received from the Ministry of Defense, Ministry of Energy and Ministry of Foreign Affairs. Construction of Storage Bunker at Site will be started soon.

3.3 Hydro-Mechanical Works The penstock pipe is used to convey the water from surge shaft to the turbine. It is an underground structure. The pipe is provided with the horizontal and vertical tunnel shaft of diameter 3.8 m and 3.5 m respectively. The penstock pipe diameter varies from 2.5 m to 2.1 m and finally 1.2 m at the portion of main inlet valve. Likewise, the thickness of the penstock pipe varies from 10 mm to 44 mm. The penstock pipe starts after the surge shaft with an invert level of 1238.89 having horizontal portion of 20.0 m length and first vertical drop of 226.0 m length. Likewise, the pipe passes through the inclined portion of 717.0 m length, and second vertical drop of 201.0 m length. After second vertical drop, it runs through an inclined portion of 934.0 m length up to trifurcation. The penstock pipe has varying diameter with varying thickness. Altogether, the penstock alignment has four bends before trifurcation. The vertical part is penstock casing with concrete infill and the horizontal part has the support piers at 8 m c/c spacing as shown in the drawings. There are two adits: one at the location of second drop shaft and another from the powerhouse site to ease the construction of the penstock pipe.

3.4 Electro-Mechanical Works Considering the head and flow available, calculated number of jets, so as to achieve maximum efficiency with the jet ratio of 12.21was found to be four (4). The overall design has been based on four (4) numbers of jets. However, number of jet can be changed if the contractor provides client with enough justification on the design. Pelton turbine with vertical shaft alignment was selected. The elevation of the turbine axis was set at 647.30 masl. Total no. of turbines is 3 with a capacity of 30400 KW each assuming the efficiency to be 91%.

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3.5 Transmission Facilities Power from the powerhouse is evacuated to Lamane, Tingla sub-station through 132 kVdouble circuit transmission line of about 12 km length, from where it is connected to the national grid.

Final TOR incorporating the comments from DOED for IEE study of transmission line was submitted to DOED and it has been approved. Further study and data collection required for preparation of IEE is being done by the consultant. Transmission line IEE draft report has been prepared. Notice has also been published regarding the IEE of Transmission line.

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Chapter 4 Other Works Related to the Project

4.1 Equity Management The total project cost will be financed in two ways: bank loan and equity financing in a ratio of 72.93:27.07. With this ratio, bank loan is 865 crores and equity financing is 321 crores. Details of this financing is shown in the table below;

Table 9. Total project cost

Cost Amount NRS (Crore) Total Project Cost 1186.00 Bank Loan 865.00 Equity Financing 321.00

Similarly, the equity financing is sub divided as promoters’ equity and initial public offering in a ratio of 60:40. The detail cost division is shown in table 9 below:

Table 10. Equity Management

Equity Management Amount NRs (Crore) Percentage(%) Promoters Equity 192.60 60 Initial Public Offering 128.40 40

Total equity financing 321.00 100

Table 11. Participating Banks and Investment Company with percentage financing

Participating Bank Term Loan (Crore) % Financing Nepal Investment Bank Ltd. 150.00 17.34% Hydroelectricity Investment & Development Company Ltd. 90.00 10.40% Rastriya Banijya Bank Ltd 75.00 8.67% Agricultural Development Bank Ltd. 75.00 8.67% Nepal Credit and Commerce Bank Ltd. 75.00 8.67% Century Commercial Bank Ltd. 75.00 8.67% Sanima Bank Ltd. 75.00 8.67% NIDC Development Bank Ltd. 75.00 8.67% Sun Rise Bank Ltd. 75.00 8.67% Prabhu Bank Ltd. 50.00 5.78% Civil Bank Ltd. 50.00 5.78% Total Consortium Financing 865.00 100.00%

4.2 Construction Planning and Scheduling

The company has already completed the construction of camp and installation of Bailey bridge 1 Construction of access road is in good progress. From the PPA Coordination Committee meeting, it has been agreed and amended the PPA document to increase the RCOD by six months so that the revised RCOD will be Sept 26, 2020 (Ashwin 10, 2077). The EPC contract has been awarded to Italian company,Cooperativa Muratori & Cementisti – CMC di Ravenna on 9th June 2017.

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Sahas Urja Ltd. Progress report of SKDKHEP # WO5 The contractor has already been mobilized at site and currently land scaping for camp construction is in progress.The overall construction schedule of the project is given in Figure 37.

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Figure 37. Construction Schedule

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4.3 Human resources

The human resources in this project are sub categorized as head office staff and site office staff. There are in total 31 staffs working in this project, of which 20 at head office and 11 at site office.

Table 12. Human resources

S. N Department Head office Site office

1 Management 3 -

2 Technical 2 4

3 Account 2 -

4 Administration 6 3

5 Support staff 7 4

Total 20 11

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Chapter 5 Some additional photos

Figure 38. EPC contractor’s staff in site investigation

Figure 39. Geological mapping work

Figure 40. Bio-engineering work at headworks area

Figure 41. Camp construction at headworks

Figure 42. Site visit by board members

Figure 43. Site visit with CMC team

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Figure 44. Camp area of EPC Contractor

Figure 45. Road upgradation work

Figure 46. Aggregate collection work at site

Figure 47. Track opening work at Road B area

Figure 48. Track opening at Road C area

Figure 49. View of headworks area From Kagel area

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Documents

SOLU KHOLA (DUDHKOSHI) HYDROELECTRIC …sahasurja.com/wp-content/uploads/2018/01/Progress-Report...East-West highway to Ramite through Katari-Ghurmi-Okhaldhunga which is 149 km in