SOLU KHOLA (DUDH KOSHI) HYDROELECTRIC PROJECT...

SOLU KHOLA (DUDH KOSHI) HYDROELECTRIC

PROJECT (86MW)

Progress Report # W06 (Dec 2017-Feb 2018)

Submitted by:

Sahas Urja. Ltd. (SUL)

Hattisar, Kathmandu, Nepal

March 2018

Sahas Urja Ltd. Progress report of SKDKHEP # W06

March 2018 i

Table of contents

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

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

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

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

Work Progress in Detail .................................................................................... 9

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

3.2 Civil Works ........................................................................................................ 18

3.2.1 General ............................................................................................................... 18

3.2.2 Adit 4 ................................................................................................................. 20

3.2.3 Explosive............................................................................................................ 20

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

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

3.5 Transmission Facilities ...................................................................................... 21

Other Works Related to the Project ............................................................... 22

4.1 Equity Management ...................................................................................................... 22

4.2 Human resources ........................................................................................................... 23

4.2.1 Employer’s Staff ..................................................................................................... 23

4.2.2 Employer’s Representative’s at Site ....................................................................... 23

4.3 Construction Planning and Scheduling .............................................................. 23

Some Additional Photos .................................................................................. 25


March 2018 ii

List of Figures

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

Figure 2. Stone Masonary work at Road A.............................................................................. 10

Figure 3. Side Drain work at Road A ...................................................................................... 10

Figure 4. Road B widening ...................................................................................................... 11

Figure 5. Gabion work at Road C ............................................................................................ 11

Figure 6. Gabion work at Road D ............................................................................................ 11

Figure 7. 24 Feet Three axle vehicle at Panchan, Road E ....................................................... 11

Figure 8. Gabion work at Road F near Bhorleni school .......................................................... 11

Figure 9. Extended road section at Road F .............................................................................. 11

Figure 10. Rock bolt at bridge 2 foundation ............................................................................ 12

Figure 11. Concreting of bridge 2 foundation ......................................................................... 12

Figure 12. Slump test and cube cast during concreting of bridge foundation ......................... 12

Figure 13. Bailey Bridge 2 installation. ................................................................................... 12

Figure 14. Metallic staircase at powerhouse camp area. ......................................................... 13

Figure 15. Powerhouse camp area. .......................................................................................... 13

Figure 16: Transmission line route in google image ............................................................... 14

Figure 17. Initial Headworks Model. ....................................................................................... 14

Figure 18. Revised Headworks Model..................................................................................... 14

Figure 19. Revised model with settling basin. ......................................................................... 15

Figure 20. Headworks model with settling basin.................................................................... 15

Figure 21. Representatives of financing institutions with Sahas Urja Ltd. team at Hydro Lab

.................................................................................................................................................. 15

Figure 22. EPC contractor's camp area progress at headworks ............................................... 16

Figure 23. EPC contractor’s Camp work at Powerhouse area ................................................. 16

Figure 24. Team of Employer’s Representative along with Sahas Urja Team ........................ 17

Figure 25. Road extension work at Ramite .............................................................................. 17


March 2018 iii

Figure 26. Social Road upgradation work ............................................................................... 17

Figure 27. Water Tank constructed for society at Bhorleni .................................................... 18

Figure 28. Social Road upgradation at Tumse area ................................................................. 18

Figure 29. Portal preparation at Adit 4 area. ............................................................................ 20

Figure 30. Progress of Adit 4 tunnel. ....................................................................................... 20

Figure 31. Construction of army camp and storage for explosive ........................................... 20

Figure 32. Camp for Army in construction progress ............................................................... 20

Figure 33. Construction Schedule ............................................................................................ 24

Figure 34. Puja at Powerhouse area ......................................................................................... 25

Figure 35. Sahas Urja Team during ground breaking program ............................................... 25

Figure 36. Army team preparing for 1st blasting at site .......................................................... 25

Figure 37. Portal preparation at Adit 4. ................................................................................... 25

Figure 38. Concreting work ft bridge 2 foundation ................................................................. 25

Figure 39. Bridge 2 foundation at Left bank............................................................................ 25

Figure 40. Bailey Bridge 2 installation work. .......................................................................... 26

Figure 41. Construction material being transported. ............................................................... 26

Figure 42. Social road Upgradation at Ramite......................................................................... 26

Figure 43. Social road being upgraded at Ramite. ................................................................... 26

Figure 44. Material transported to site ..................................................................................... 26

Figure 45. Team of contractor at site. ...................................................................................... 26


March 2018 iv

List of tables

Table 1 Company details ........................................................................................................... 1

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

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

Table 4 Summary of previous activities completed till November 2017 .................................. 6

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

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

Table 7. Manpower of EPC contractor at site. ......................................................................... 15

Table 8. Plant and equipment of EPC contractor at site. ......................................................... 16

Table 9. List of Road constructed for society .......................................................................... 18

Table 10. Total project cost ..................................................................................................... 22

Table 11. Participating Banks and Investment Company with percentage financing ............. 22

Table 12. Employer’s Representatives .................................................................................... 23


March 2018 1

About the Company

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 of Director Position

Mr. Him Prasad Pathak Chairman

Mr. Sushil Thapa Managing Director

Mr. Min Raj Kadel Director

Mr. Paritosh Paudyal Director

Mr. Mahendra Kumar Giri Director

Mr. Bhoj Bahadur Shah Director

Mr. Mukti Ram Pandey Director


March 2018 2

1.3 Organization Structure

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

Managing Director

Project Manager

Site Team

Technical Division

Support Division

Public Relation & Environment

Head Office Team

Technical Division

Finance Division

Support Division

Advisor

Chairman


March 2018 3

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 Gaupalika at 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 Gaupalika of Solukhumbu District. Geographically, the physical area of the project

lies within longitudes of 863735E to 864115E and latitude of 272153N to 272515N.

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. After acquiring Hydro Venture Private Limited by Sahas Urja Limited

(SUL), Sahas Urja Ltd is carrying out the infrastructure development works.

2.2 Project Location and Accessibility

The proposed headworks site lies at an elevation of 1255.0 m near Gairi Gaun of Tinla of Necha-

Salyan Gaupalika and the powerhouse is located at an elevation of 643 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 9 km


March 2018 4

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 Jor-

Buddha, 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


March 2018 5

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 up-to 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


March 2018 6

S.N. Components Description Size (B x H) 4.6 m x 1.9 m

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

Following Table 4 presents the summary of activities and progress of the project from the date of

survey license to November 2017.

Table 4 Summary of previous activities completed till November 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. Jan to Oct 2013

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


March 2018 7

SN Activities Dates

7. Application for Generation License to DoED. Oct-2013

8. Award of Generation License by DoED. Sept. 2014

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 institution. 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 and Financial 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. Amendment of PPA for revised RCOD (Sept 26, 2020). Dec 2016

25. Final ToR for IEE of Transmission line submitted after

incorporation of comment. Feb 2017

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

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


March 2018 8

SN Activities Dates

28. EPC Contract agreement signed with Cooperativa Muratori &

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

29. Installation of Bailey Bridge 1 is complete. June 2017

30. NEA PPA transfer. July 2017

31. Survey License of Transmission line transferred in the name of

Sahas Urja Ltd. August 2017

32. Detail Design Report submitted by Consultant. September 2017

33. Land purchase limit approval obtained. September 2017

34. 1st phase Vetiver plantation work completed (bio-engineering). September 2017

35. TOR for IEE for transmission line Approved. September 2017

36. Contractor’s mobilization at site. October 2017

37. Contract agreement with the Department of Forest regarding tree

cutting and land use November 2017

2.5 Summary of Recent Works

Similarly, the activities of the project during this reporting period i.e. from December 2017 to

February 2018 are listed below in table 5;

Table 5. Summary of recent activities

S. No. Activities Dates

1. Operation of Powerhouse camp started December 2017

2. Track opening of access road completed December 2017

3.

Contract with the Consortium of Hydro-Consult Engineering Limited

and Fichtner GmbH & Co.KG as Employer’s Representative/

Consultant.

December 2017

4. Ground breaking program of tunnel works. January 2018

5. Modification on headworks at Hydro Lab Pvt. Ltd. January 2018

6. Final approval for the use of explosive February 2018

7. Mobilization of Employer’s Representative at site. February 2018

8. Upgradation of existing access road. Ongoing

9. EPC Contractors camp construction work. Ongoing

10. Landscaping work at camp area. Ongoing

11. Construction of bunker for Army camp and explosive storage Ongoing


March 2018 9

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 completed, track opening of access

road is also complete while upgradation of access road is ongoing. Installation of Bailey Bridge 1

and Bailey Bridge 2 has been completed.

Engineer, Procure Construct (EPC) contract has been awarded to the Italian company, Cooperativa

Muratori & Cementisti – CMC di Ravenna on 9th June 2017 after negotiation on technical,

commercial and price on the offer submitted. The contractor has been mobilized at site. Currently

camp construction work and Adit 4 tunnel work is in progress. Similarly, contract has been awarded

to Consortium of Hydro Consult Engineering Limited and Fichtner GmbH & Co.KG on 18th

December 2017 as an Employer’s Representative/ Consultant.

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.

From the Ministry of Land Reform and Management approval for acquisition of 239 Ropani of

land was obtained in the month of September.

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

done in the month of November 2017.

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. Opening of track connecting headworks to Powerhouse is complete. Details of

access road track opening is listed in Table 6. At the same time, upgradation of access road is

ongoing at different sections.


March 2018 10

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 1.540

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 Bridge 1- Headworks 0.300 0.300

Total 21.711 21.711

The powerhouse is also accessible via Salleri-Tumse-Panchan Road or Jor-Buddha- Tumse -

Panchan. Jor-Buddha-Tumse section is currently being upgraded by ADB funded project. Road

from Tumse to Panchan is being upgraded on timely basis by Sahas Urja Ltd. From Panchan

onwards Road E will be used to access Maikhubesi i.e. Powerhouse location.

At various locations road upgradation activities are ongoing. Till February, approximately 8,158m3

of gabion works, 302 m3 of dry wall and 318 m3 of stone masonry works has been executed at site.

Figure 2 and Figure 3 shows the access road with structures at Road A sections.

Figure 3. Side Drain work at Road A

Figure 4 shows the upgraded section of Road B and Figure 5 shows the gabion structure at Road

C. Similarly, Figure 6 and Figure 7 shows the upgradation of Road D and Road E respectively.

Figure 2. Stone Masonary work at Road A


March 2018 11

Figure 4. Road B widening

Figure 7. 24 Feet Three axle vehicle at Panchan,

Road E

Similarly, Figure 8 and Figure 9 shows the sections of road F.

Figure 8. Gabion work at Road F near Bhorleni school

Figure 9. Extended road section at Road F

iii. Bailey Bridge

Two bridges 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 70 R according to Road

Standards. The span of these bridge is 120 feet.

Figure 5. Gabion work at Road C

Figure 6. Gabion work at Road D


March 2018 12

Bridge 1

Construction of Abutments with installation of Bailey Bridge -1 was 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

Installation of Bailey bridge 2 is completed whereas the second stage concrete is planned to

complete in a week period. There are concrete pads on both banks for Bridge 2 as the foundation

of these pads are on rock surface. The hard rock was excavated up to the design level and the

concrete pads were constructed on both the sides. After that Bailey Bridge 2 of 70 R capacity was

installed. Figure 10 shows the rock bolt at the foundation of bridge similarly Figure 11 shows the

concreting work of the bridge foundation. Similarly, in Figure 12 slump test and cube casting is

shown. Figure 13 shows the progress of Bailey bridge 2 installation at site.

Figure 10. Rock bolt at bridge 2 foundation

Figure 11. Concreting of bridge 2 foundation

Figure 12. Slump test and cube cast during concreting

of bridge foundation

Figure 13. Bailey Bridge 2 installation.


March 2018 13

iv. Camp and Other Facilities

Temporary camp establishment at Bhadaure near Headworks, Bhorleni, near Adit-2 and Surge

tunnel area and Maikhubesi near powerhouse has been completed. Most of the camp work like

fencing, landscaping is also completed except some finishing works.

There are five building blocks 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. Office building along with admin site office has been

set up at headworks.

Similarly, there are five blocks at powerhouse with three senior residential quarters, one office

block and one kitchen block. The camp is being used for accommodation since December 2017.

Figure 14 shows the metallic staircase installed for the access from resident quarter to kitchen and

office. The land scaping and the camp area at powerhouse is shown in Figure 15

Figure 14. Metallic staircase at

powerhouse camp area.

Figure 15. Powerhouse camp area.

The camp facilities include furniture, mesh utensils, office equipment’s, TV, internet etc.

v. 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. TOR of IEE for transmission line has been approved and

IEE report is in process. Figure 16 shows the transmission line route with the position of tower in

google map.


March 2018 14

Figure 16: Transmission line route in google image

vi. 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, modification of headworks was done. The headworks

model has been revised as per the suggestion from Professor Dr. Haakon Stole. The new model

contains the settling basin as a part of headworks modelling. The photograph of model test is shown

Figure 17, Figure 18, Figure 19, Figure 20. Representatives of the lead bank and the consortium

member of financing institutions visited the Hydro Lab on 9th January 2018 after the completion of

design modification. Figure 21 shows the representatives of financing institutions with Sahas Urja

Ltd. team at Hydro Lab.

Figure 18. Revised Headworks Model Figure 17. Initial Headworks Model.


March 2018 15

Figure 19. Revised model with settling basin.

Figure 20. Headworks model with settling basin.

Figure 21. Representatives of financing institutions with Sahas Urja Ltd. team at Hydro Lab

vii. Contractor’s Mobilization

Contractor’s team is at site since October 2017. The Project Manager and Production Manager

along with other supporting staffs were initially mobilized. Currently, Technical team, Camp

construction team and survey team are also mobilized. The Adit 4 tunnel work and camp

construction work at headworks and powerhouse area is in progress. Technical Consultant of the

EPC contractor, Lombardi Engineering Limited from Switzerland has visited the site on 2nd week

of February 2018, and the design works has started after the site visit. Table 7 and

Table 8 below shows the manpower, plant and equipment of the contractor at site.

Table 7. Manpower of EPC contractor at site.

S.N Personnel Nos

1 Project Manager 1

2 Managers 3

3 Technical Engineer 1

4 Surveyors 2

5 Electrician 3


March 2018 16

Table 8. Plant and equipment of EPC contractor at site.

Figure 22 shows the temporary camp construction progress of EPC contractor at Headworks

area, and Figure 23 shows the progress of camp construction work of EPC contractor near

powerhouse.

Figure 22. EPC contractor's camp area progress at

headworks

Figure 23. EPC contractor’s Camp work at

Powerhouse area

6 Supervisors/Foremen 4

7 Mechanic 2

8 Welder 2

9 Driller 4

10 General Helper 7

11 Assistant Surveyor 1

12 Blaster 1

Total 31

S.N Plants/Equipment Nos

1 Excavator 1

2 Dump Truck 4

3 Shotcrete Machine 1

4 Drill Gun Machine Pneumatic 1

5 Welding Machine 3

6 Diesel Compressor 1

7 Generator 1

8 Concrete mixture 1


March 2018 17

viii. Employer’s Representative Mobilization

Contract has been awarded to Consortium of Hydro-Consult Engineering Limited and Fichtner

GmbH & Co.KG on 18th December 2017 as an Employer’s Representative. A team of Consortium

has already been mobilized at site.

Figure 24. Team of Employer’s Representative along with Sahas Urja Team

ix. 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 expert suggested 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.

x. Social Works

The project has been doing different social activities in project affected areas. 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 in Figure 25 and Figure

26. Beside that maintenance of village road from Tumse to Panchan, and Maikhubesi to old

suspension bridge was also upgraded on the request of local people. The recent activities on the

different sections of the social road are listed in Table 9.

Figure 25. Road extension work at Ramite

Figure 26. Social Road upgradation work


March 2018 18

Similarly, a water tank of 1000 ltrs capacity shown in Figure 27 has been constructed at Bhorleni

on the request of local people. Excavator and JCB has also been used for various social purpose at

Panchan and Tingla area. Figure 28 shows the upgradation of Tumse Panchan road.

Figure 27. Water Tank constructed for society at

Bhorleni

Figure 28. Social Road upgradation at Tumse area

Table 9. List of Road constructed for society

S.N Road Description Total length(km) Status

1 Ramite to Surge tank of LSHEP

(82mw)

2.5 Widening and upgrading

2 Maikhubesi to old suspension bridge 0.7 Upgrading

3 Tumse to Panchan 9.3 Widening and

maintenance

3.2 Civil Works

3.2.1 General

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

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


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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

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 low pressure tunnel

from the surface settling basin to the surge tank. However, the size of the tunnel is taken as 4m


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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.

3.2.2 Adit 4

Adit 4 located near powerhouse is of length 337.84 m and of internal size 3.8 m inverted D shape.

EPC contractor is currently preparing for the construction of Adit 4. Portal preparation is

completed. First blasting was started on 22nd January 2018 by CMC. Figure 29 shows the

preparation of portal at Adit 4 similarly Figure 30 shows the progress of tunnel of Adit 4.

Figure 29. Portal preparation at Adit 4 area.

Figure 30. Progress of Adit 4 tunnel.

3.2.3 Explosive

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 is in progress. Currently excavation for the bunker is going on. The Figure

31and Figure 32 shows the construction work of army camp and the storage for the explosive near

Bhorleni camp.

Figure 31. Construction of army camp and storage

for explosive

Figure 32. Camp for Army in construction progress


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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 12.21 was 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%.

3.5 Transmission Facilities

Power from the powerhouse is evacuated to Lamane, Tingla sub-station through 132 kV double

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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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. Details of this financing is shown in the table below;

Table 10. Total project cost

Cost Amount NRS (Crore)

Total Project Cost 1186.00

Bank Loan 865.00

Equity Financing 321.00

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%


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4.2 Human resources

4.2.1 Employer’s Staff

The human resources of the employer in this project are sub categorized as head office staff and

site office staff. There are in total 17 staffs working in this project including head office and site

office.

4.2.2 Employer’s Representative’s at Site

After the contract agreement as Employer’s Representative, Consortium of Hydro-Consult

Engineering Limited and Fichtner GmbH & Co.KG are in site since February 2018. Table 12 shows

the list of Employer’s Representatives at site.

Table 12. Employer’s Representatives

S.

N

Department Number

1 Resident Manager 1

2 Resident Engineer 1

3 Civil Engineer 3

4 Geologist 1

5 Geomatics Engineer 1

6 Account and Admin Officer 1

7 Supervisor 2

8 Helper 3

Total 13

4.3 Construction Planning and Scheduling

The company has already completed the construction of camp and installation of Bailey bridge 1

and Bailey Bridge 2. The revised RCOD as agreed with NEA is 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. Similarly, contract has been awarded to Consortium of Hydro

Consult Engineering Limited and Fichtner GmbH & Co.KG on 18th December 2017 as an

Employer’s Representative.

The overall construction schedule of the project is given in

Figure 33.


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Figure 33. Construction Schedule


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Some Additional Photos

Figure 34. Puja at Powerhouse area

Figure 35. Sahas Urja Team during ground breaking

program

Figure 36. Army team preparing for 1st blasting at site

Figure 37. Portal preparation at Adit 4.

Figure 38. Concreting work ft bridge 2 foundation

Figure 39. Bridge 2 foundation at Left bank


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Figure 40. Bailey Bridge 2 installation work.

Figure 41. Construction material being transported.

Figure 42. Social road Upgradation at Ramite

Figure 43. Social road being upgraded at Ramite.

Figure 44. Material transported to site

Figure 45. Team of contractor at site.

SOLU KHOLA (DUDH KOSHI) HYDROELECTRIC PROJECT...

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