The presentation provided an overview of the Mohmand Dam Hydropower Project, including project details, progress, challenges, and issues delaying completion. Key points included: the project involves constructing a 213m dam, diversion tunnels, and powerhouse; major challenges include complex geology and large rockfill quantities; delays have been caused by COVID impacts, tunnel convergence, and contractor performance issues like inadequate planning and resources; critical activities requiring focus are quarry development and tunnel completion; contractual actions may be needed to improve progress.

1. Mohmand Dam Hydropower Project
Presentation to the Chairman WAPDA
17 August 2022

2. DISCUSSION
• Project Brief
• Project Progress
• Project Challenges
• Construction Challenges
• Construction Progress
• Issues and Bottlenecks
• Status of the Contractor’s Extension of Time Claims
1

3. PROJECT BRIEF
2

4. Spillway
CFRD Dam
(213 m)
Project Colony
Switchyard
Diversion
Tunnels
Right Bank
Access Road
Left Bank Access Road
Powerhouse
u/s
Coffer Dam
LAYOUT PLAN
Right Bank
Irrigation Intake
Left Bank
Irrigation Intake
Mohmand
Dam
Reservoir

5. BRIEF PROFILE OF PROJECT
Location:
The project is being constructed across Swat River at a distance of about 48 km from
Peshawar in Mohmand Tribal District, KP.
Objectives:
Hydropower Generation 850 MW
Annual Energy 2.862 Billion units
Gross Storage 1.293 MAF
Irrigated Agricultural Development 16,737 Acres (Revised
18,237)
Drinking Water Supply to Peshawar 470 cusecs (304 MG/day)
Flood Control
Socio-economic uplift of project area

6. Operation Peaking hydropower with re-regulation
Dam height/ Crest length 213 m high with a crest length of 718 m
Type of Dam Concrete Faced Rockfill Dam
Gross / Live Storage 1.293 / 0.676 MAF
Spillway Capacity 27,427 m3/s PMF
Diversion Tunnels 2 Nos. Each 1.7 km long & 15m diameter
Power Generation
800MW from 4 x 200MW Francis Turbines
and 3,000GWh/year
Irrigation + Water Supply 18,237 Acres + 13 cumecs Peshawar WS
Right Bank Irrigation System 3.6 km Tunnel + 11.7km Canal
Left Bank Irrigation System 4.8 km Tunnel + 12.4 km Canal
PROJECT SALIENT FEATURES
5

7. Signing of Contract Agreement
March 26, 2019
Accepted Contract Price PKR
224.463 Billion
(Including Foreign Comp. of US$ 716 Million)
Contract Duration after EoT-1 of 215 days
6 Years and 3 months (2285 days)
Contractor’s Mobilization w.e.f April 04, 2019
Commencement Date Sept: 20, 2019
CONTRACTOR: CGGC-DESCON JV

8. Signing of Consultancy Service Agreement
May 20, 2019
Contract Price
PKR 9.982 Billion
Contract Duration
8 Years & 4 months (100 Months)
Commencement of Consultancy Services
w.e.f May 27, 2019
CONSULTANTS: MOHMAND DAM CONSULTANTS GROUP
JV of NESPAK (Lead Firm)-Pakistan, MWH-USA, SMEC-Australia,
DOLSAR-Turkey, ACE-Pakistan and MM Pakistan in association with 7 Firms

9. PROJECT PROGRESS
8

10. CONTRACTOR’S SITE FACILITIES AND
INFRASTRUCTURE
9
Situation:
 Contractor's mobilisation started in
mid – 2019
 Challenges through 1st and 2nd
waves of COVID
Outcomes:
 All site infrastructure now in place
 Works on key work fronts being
executed
Contractor’s Camp and Office
Batching & Crushing Plants
Site Access Roads and Infrastructure

11. DIVERSION TUNNELS INLET WORKS
10

12. DIVERSION TUNNELS OUTLET WORKS
11

13. SPILLWAY
12
Spillway Crest looking downstream
Upper Stilling Basin
Lower Stilling Basin

14. POWER INTAKE
13
Power Intake – cut slope with high capacity post tensioned anchors

15. POWERHOUSE AREA
14
Switchyard Platform
Powerhouse cut slope

16. POWER INTAKE & DT INLET WORKS
15
Main Dam fill stockpile
DT – Inlet Works
Project Colony
Power Intake
Works
Haul Road Bailey Bridge
View from Todobo Quarry

17. PROJECT CHALLENGES
16

18. 17
Situation:
 5th highest CFRD in the World at 213 m
 Seismically active area
 17M m3 of rockfill required from local sources
 Challenging rate of rock filling required = 23,000
m3 per day
Actions:
 Detailed investigations and testing of rockfill
materials from local quarry
213 m CFRD DAM
Dam Body
 Zoned rockfill dam
 Quartzite and
limestone quarries
available at Project

19. 18
Situation:
 Specialized concreting of dam face slab
 3 stage concreting
Actions:
 Experienced designers:
- Mohale Dam, Lesotho
- Kárahnjúkar Dam, Iceland
 Experienced Chinese Contractors (CGGC)
Kárahnjúkar Dam, Iceland
Mohmand Dam
213 m CFRD DAM
Situation:
 Deep main grout curtain in complex
geology
Actions:
 Extensive investigations and trials

20. 19
SPILLWAY
Situation:
 PMF Flood capacity = 27,500 cumecs
 Ogee to riverbed = 215m
 Spillway length = 600m long
Actions:
 Double stilling basin arrangement
 Extensive hydraulic model testing at IRI
Nandipur
215m
high
PMF
600m long
Upper Stilling Basin
Lower Stilling Basin
Gated Ogee

21. 20
GEOLOGY
Situation:
 Sequence of tectonically deformed Schist
 strongly developed foliation surfaces, and
 zones of polished graphitic Schist and talc
 little groundwater
Actions:
 Exacting site investigations to understand the
geology and geotechnical parameters:
 Addition borehole campaign
 Spillway crest and CFRD plinth
investigations
 Extensive Hydro jacking testing
 Real-time feedback loop during tunnelling and
surface excavations works to designers

22. 21
DIVERSION TUNNELS – Large diameter in variable geological
conditions Situation:
 2 x 17.0m excavated diameter both 1.7km long
 Encountering weaker zones in foliated Schist
Actions:
 Managed with split-heading excavation
 Prudent real time interpretation of tunnel face
conditions
 Convergence encountered at Inlet due to weak
geology in both tunnels – addition support
measures being installed
Outcome:
 DT-1 header completed - breakthrough Dec
2021
 DT-2 header completed - breakthrough Feb
2022
 Concrete lining in progress – minor excavation
left

23. 22
HIGH CUT SLOPES
Situation:
 High cut slope:
 180m at the Spillway lower stilling basin,
 150m at the Powerhouse
 120m at the Power Intake
 Foliated Schist in seismic area
Actions:
 Heavy slope reinforcement with high capacity
ground anchors
 Real time geological interpretation at each
bench
 Engineer and Contractor working together at
each bench for detailed assessment of
support
SPILLWAYS

24. CONSTRUCTION CHALLENGES
23

25. 24
DIVERSION TUNNELS COMPLETION FOR RIVER DIVERSION
Current Status
• Large Convergence at Inlet structures of DT 1& DT 2.
• Project Management:
• Lack of senior management and senior works technical managers
• No management and coordination of day-to-day material requirement / equipment
requirements
• Construction Management:
• Lack of efficient resources / unspecialized crews for lining works, resulting in
excessive assembly time for Arch shutters, rebar placement, and shutter fixing.
• Frequent material stock shortage for concrete placement including fine and
coarse aggregates
• Concrete temperature – lack of cooling plant facilities to control high concrete
temperatures. Inadequate storage facility for proper material storage.
• The Contractor proposed additional audit to overcome delays due to convergence

26. 25
DIVERSION TUNNELS COMPLETION FOR RIVER DIVERSION
WAY FORWARD:
• Expedite shutter assembly. Improve material forecast and ensure sufficient material
available to meet production needs.
• Mobilize specialized trades. Prepare realistic targets and work as a team to meet
targets and overcome challenges
• Addition of new Access Tunnel to facilitate lining works in the presence of convergence
at Inlet areas in both tunnels.

27. 26
…
NEW ACCESS TUNNEL TO MINIMIZE DELAYS DUE TO CONVERGENCE

28. 27
QUARRY DEVELOPMENT FOR MAIN DAM EMBANKMENT
SCOPE OF WORK = Quarry Development for Main Dam Fill (17 Million Cum)
Facts:
1. In the contract, the Contractor was required to explore both locations, Todobo and Sappare
2. Contractor claimed that Todobo quarry will be sufficient to meet dam embankment fill quantity
and material specifications. The Engineer required the Contractor to explore both locations.
Todobo Quarry:
1. Contractor geological investigation - results are not reliable due to poor quality of coring
technique.
2. Investigation resulted in Maximum Size 400mm and large sizes may not be obtained from
Todobo.
3. Rockfill trial embankment was initially planned in first week June 2022.
4. 2 out of 10 proposed Trial Blast considered by the Contractor. The last trial blast was done in
March 2022.
5. The access roads to the quarry are still in progress.

29. 28
Current Status - Sappare Quarry:
1. Resource for all aggregates and rockfill on the project as investigated by the Engineer.
2. Client currently drilling investigation holes to prove limestone strength for rockfill.
• Land leasing is delayed. Contractor is facing problems to find the landowner of specific area
where the material shall be tested for trial blast.
• Descon Contractor JV partner has leased 60 acres for aggregates production. CGGC has not
done any coordination for trial blast for filters and rockfill.
• Geological investigation for quarry exploitation by Contractor not started yet as per SP-21.
• Surface investigation done by the Engineer. Material was tested on the surface and tests are
ongoing for UCS and Point Load in site laboratory.
• The Client authorized the geological investigation to confirm the quality of rock for rockfill, due
to inconsistencies in the UCS results reported in the feasibility stage as compared with the
estimated value from Schmidt Hammer tests done on site in April 2022.
• Engineer already approved the laboratory proposed for large scale triaxial test in China
Changjiang Institute.
QUARRY DEVELOPMENT FOR MAIN DAM EMBANKMENT

30. 29
WAY FORWARD:
• Contractor to expedite Sappare Quarry Development (Access Roads, Blasting, Material
Testing, Stockpiling process which is pre-requisite for Main Dam Fill proposed by Contractor
in their method statement).
• Employer facilitate the Contractor in acquiring land for quarry exploration
• Engineer already approved the laboratory proposed for large scale triaxial test in China
Changjiang Institute.
QUARRY DEVELOPMENT FOR MAIN DAM EMBANKMENT

31. CONSTRUCTION PROGRESS
30

32. COMPONENT WISE PROGRESS (31 JUL 22)
31

33. OVERALL PROJECT PROGRESS (31 JUL 22)
32
698 days
Attributable
to Contractor

34. MONTHLY PROGRESS TREND
33
Report
Month
Cumulative
Planned %
Complete
Cumulative
Actual %
Complete
Cumulative
Variance Trend
Period Trend
Nov-21 34.36% 13.43% -20.94% 0.98%
Dec-21 36.94% 14.36% -22.58% 0.93%
Jan-22 39.94% 15.18% -24.76% 0.82%
Feb-22 41.37% 15.94% -25.43 0.76%
Mar-22 42.8 % 16.73% -26.07% 0.79%
Apr-22 43.95 % 17.5% -26.45% 0.77%
May-22 45.24% 18.29% -26.95% 0.79%
Jun-22 46.56% 18.98% -27.58% 0.69%
Jul-22 47.54% 19.55% -27.99% 0.55%

35. MILESTONE DATES
34
Milestone Description
Contractual Milestone
(EoT-MW-01)
Contractor’s
Monthly Forecast
(Jul 2022)
1. Diversion Tunnels Completion
15 Feb 22
(River Diversion:
17 March 2022)
25 Jun 2023
(River Diversion: 01
Mar 2023)
2. Main Dam - Quarry Investigation 23 Dec 2020 24 Jun 2023
3. Main Dam Completion 20 May 25 26 September 2026
4. Completion of Whole of the Works 21 Dec 25 02 October 2027

36. DIVERSION TUNNEL LINING PROGRESS
35

37. DIVERSION TUNNEL LINING PROGRESS
36

38. DIVERSION TUNNEL LINING PROGRESS
37

39. MAJOR REASONS FOR DELAYS
38
Milestone Milestone Description
Contractual
Milestone
Consultant's
Forecast
Delayed due to:
A Lot 1 Works
1 Construction of Right Bank Permanent Access Road 17-Mar-20 31-Aug-22* COVID 19/Slow progress
2
Construction of Wapda Colony (Project Office, Officer and staff
hostels, Category 1 & 2 family houses, mosque and high school)
including roads & utilities
15-Jun-20 31-Aug-22* COVID 19/Slow progress
3 Completion of the whole of the works 17-Mar-21 31 May 23* COVID 19/Slow progress
B Lot 2 Works
1 Completion of Diversion Tunnels 15-Feb-22 23-Oct-23
COVID 19/Slow
progress/Convergence
2
Completion of Control Room in Control House of Dam to install
instrumentation and control facilities
19-Feb-25 9-Dec-26
C Lot 3 Works
1 Completion of Left and Right irrigation Tunnels in all respects 23-Dec-24 7-Dec-26 COVID 19/Slow progress
2 Initial Filling, Testing and Emptying of Canal System 23-Mar-25 29-Sep-26
D
Combined Lot 2 Works and Lot 4 Installation/ Erection, Testing and
Commissioning
1
Ready to reservoir impounding under LOT 2 and LOT4
1) Completion of dry test of all maintenance gates of LLO
2) Completion of Spillway
3) Completion of flushing outlet including dry test of gates and
Stoplogs
20-Apr-25 1-Feb-27 COVID 19/Slow progress
E Overall Completion of Works for Lot 2, Lot3 and Lot 4
1 Completion of whole of the works 21-Dec-25 19-Nov-27

40. ISSUES AND BOTTLENECKS
39

41. CRITICAL ISSUES IMPACTING PROGRESS
40
External causes:
• Impact of Covid-19
• Convergence in Diversion Tunnels
• Delayed foreign currency payments
Contractor’s cause:
• Lack of planning and scheduling capability
• Poor submissions of Detailed Time Program /schedules (intentional)
• Lack of Resources (labour & equipment) and inefficient utilization
• Slow work progress on Critical Activities
• Lack of Contract Management/Administration:
• Poor contract understanding resulted in poor submissions: unsubstantiated
claims (intentional)

42. 41
CRITICAL PATH ACTIVITIES – REQUIRING IMMEDIATE FOCUS
• Quarry Development
• DT completion
• QA/QC
• Provide – senior experienced management for overall site management and
coordination
• Provide planning and scheduling capability
• Provide experienced Quarry Management
• Provide experienced QA/QC management
• Provide experienced HSE Management
• Build-up Resources: Manpower & Equipment / Machinery
ACTIONS

43. 42
CONTRACTUAL ACTIONS SUGGESTED FOR THE ENGINEER TO
IMPROVE WORK PROGRESS
Contractor to:
• Submit Detailed Time Program incl. EOT-1 (215 days) as per the Contract
• - Latest submission 29 March 2022 – rejected
• Manage the efficient deployment and utilization of resources.
• Deploy authorized project management and provide Head Office support.

44. 43
STAKEHOLDERS EFFORTS TO IMPROVE PROGRESS.
Employer:-
Facilitating the Contractor with land lease for Quarry development works
Engineer:-
Providing full technical assistance to the Contractor at site
Providing IFC drawings timely to the Contractor to avoid delays
Maintaining the quality of works at site
Contractor:-
Deployed new Management
Submitted acceleration proposal to cover delays due to convergence
Committed to deploy more resources

45. 44
8.3 PROGRAMME
Eight submissions by the Contractor to date.
Last submission by the Contractor was made on 29 Mar 2022 – Engineer’s major
comments were:
• Previous delays, already claimed and determined by the Engineer in EOT 1, still
present in revised schedule.
• Contractual Milestone Dates – not incorporated
• Contractor’s Resources –not provided, their productivities and Planned
durations - not justified
• Unjustified lags
• Unrealistic Total Float due to inaccurate inter-activities relationship
Submissions were rejected and returned for resubmission.

46. STATUS OF EOT AND CLAIMS
45

47. STATUS OF EOT CLAIMS
46
Sr. No. Description
Days
claimed
Date of
Submission
Cut-off date Status
1
1st
phase Extension of Time (EOT-
MW-01) for completion of Lot 2,3 &4
808 7 Sep 2020 31 July 2020
Engineer’s determination issued on 15.06.2021
for EOT for 215 days for Lot-2 &4 and 97 days
for Lot-3 after obtaining WAPDA Authority’s
approval on 25.05.2021.
2
Extension of Time for construction of
Right Bank Permanent Access
Roads under Lot-1
1271 3 Mar 2020 11 February 2020
The Contractor’s submission with letter 4471 of
12.3.2022 has been responded by Engineer with
comments, refer Engineer’s letter no. 7239 of
05.05.2022. Contractor’s response is awaited..
3
Extension of Time for construction of
Project Colony (Priority 1 Works)
under Lot-1
1597 15 Aug 2020 1 June 2020
The Engineer has prepared his draft
determination and shall invite the Employer for
review and consultation for finalization.
4
Extension of Time (EOT-PW-03) for
completion of Lot-1 Priority 2 Works
1244 5 Apr 2021 31 January 2021 Under review by the Engineer
5
2nd
Phase of Extension of Time
(EOT-DT-02) for completion of
Diversion Tunnels under Lot-2
234
25 June
2021
31 May 2021
The Engineer has prepared his draft
determination and submitted to the Employer for
review and consultation, ref. our letter no. 7400 of
22.05.2022..
6
Extension of Time for construction of
Right Bank Permanent Access
Roads under Lot-1
427 08 Aug 2021 31 March 2021 Under review by the Engineer

48. STATUS OF EOT CLAIMS
47
Sr. No. Description
Days
claimed
Date of
Submission
Cut-off date Status
7
Extension of Time for construction of
Project Colony (Priority 1 Works)
under Lot-1
509 24.03.2022 30 November 2021
Under review by the Engineer
8
EOT-3-MW: Completion of Lot-3
works
667 17 July 2021 30 April 2021
The Engineer has prepared his draft determination
and shall invite the Employer for review and
consultation for finalization.
9
EOT-4-PW: Completion of
Powerhouse Works
91 12 Oct 2021 13 April 2021
The Engineer shall initiate the consultations with
the parties for has determination.
10
EOT-5-MW: Completion of Lot-3
works
276 18 May 2022 31 Jan 2022 Under review by the Engineer
During a meeting held between the Employer, the Engineer and the Contractor on 04 July 2022, it was agreed by the parties that the Contractor shall
submit his all remaining claims for delaying events for each lot enabling the Engineer to issue his determination lot wise (i.e., combining the submitted
EOTs lot-wise) for all delaying event with following cut-off dates:
Lot-1 – 31 December 2021
Lot-2 – 31 December 2021
Lot-3 – 31 January 2022
The Engineer will proceed for the evaluation of EOTs on receipt of final submissions of remaining delaying events / EOTs which is awaited from the
Contractor.

49. Variation Orders
48
Sr.
No
Last Submission Date Description Status
1 MDCG/MF/01/7476 30/05/2022
Construction of Multi Cell Box Culverts at Left & Right Bank
Access Roads
VO prepared.
2 MDCG/MF/01/7476 30/05/2022
Variation due to provision of drain at open cut slope of Diversion
Tunnels, Access Tunnel and Power Intake Portals
VO prepared.
3 MDCG/MF/01/7476 30/05/2022 Varied work in the Sewerage System of Project Colony VO prepared.
4 MDCG/MF/01/7606 13/06/2022
Variation due to provision of Overhead Water Tanks at Project
Colony Buildings
The Contractor’s response is
awaited.
5 MDCG/MF/01/4962 30/07/2021
Variation due to Design changes in Boundary/Periphery Wall of
Project Colony
The Contractor’s response is
awaited.
6
CDJV-MDHP-MDCG-
2022-4893
27/05/2022
Variation due to change in foundation of Project Colony
buildings
Contractor’s Design
justifications is under review by
the Engineer for response.
7 MDCG/MF/01/7477 30/05/2022
Variation due to provision of Access Bridge at Power Intake and
Waterway
The Contractor’s proposal is
awaited.
8 MDCG/MF/01/4728 21/06/2021
Variation of surface excavation and rock support for power intake
and power waterway
The Contractor’s response is
awaited

50. Variation Orders
49
Sr.
No
Last Submission Date Description Status
9 MDCG/MF/01/7049 11/04/2022 Variation of Storm water drainage system in Project Colony
The Contractor’s proposal is
awaited.
10 MDCG/MF/01/6090 08/12/2021 Project Colony Land Development
The Contractor to provide the
breakdown of the Land
Development BOQ item
11
GM&PD/MDHP/TDC-
04/4050-52
04/04/2022 Variation for Provision of Cooking range in Cat-5 buildings
Upon Employer’s confirmation, the
VO has been cancelled.
12 MDCG/MF/01/7834 13/07/2022
Variation due to construction of retaining wall due to level
difference for project colony buildings.
The Contractor’s response is
awaited.
13 MDCG/MF/01/7533 06/06/2022 Variation of stone masonry retaining wall along Access Road
The Contractor’s response is
awaited.
14 MDCG/MF/01/6919 28/03/2022 Variation due to Class-G Concrete Lining in DTs
The Contractor’s response to the
Engineer’s comments is awaited.
15 MDCG/MF/01/4728 21/06/2021
Variation due to Tensioned ground anchors at Power Intake
and Power Waterway
The Contractor’s response to the
Engineer’s comments is awaited.

51. Variation Orders
50
Sr.
No
Last Submission Date Description Status
16 MDCG/MF/01/6919 28/03/2022 Variation due to Class-G Concrete Lining in DTs
The Contractor’s response to the
Engineer’s comments is awaited.
17 MDCG/MF/01/7830 13/07/2022 Variation regarding the adjustment of generator parameter
The Contractor’s response to the
Engineer’s comments is awaited.
The Employer through his letter no. 4970-74 provided comments from CCC regarding interpretation of Sub-Clause 3.1 (B)
ii of PCC and advised the Engineer to exercise his powers to issue Variation Orders up to 2% of the accepted Contract
price. After further deliberations and correspondence exchanged, the Engineer shall proceed accordingly for issuance of
the VOs.

52. CONTRACTUAL MATTERS
51
• LOT-2 - DIVERSION TUNNEL COMPLETION - APPLICATION OF LDS
EoT-2 - DT EoT only – preliminary assessment EoT 84 days
EoT assessment to be approved by BOM and Employer
• LOT-3 - RIGHT OF ACCESS TO AND POSSESSION OF SITE
EOT-MW-03 – Preliminary assessment EOT 272 days.
The Engineer’s Draft determination shall invite the Employer for review and consultation for
finalization.
• EXERCISING VO POWERS
The Employer advised the Engineer to exercise his powers to issue Variation Orders up to 2% of the
accepted Contract price.

53. CONTRACTUAL MATTERS
52
• PANDEMIC CORONA VIRUS (COVID-19)
The Contractor is serving claim notices (EoT & Cost) under force majeure Clause 19 & Employer’s
risk Clause 17.
No entitlement for cost under these clauses:
Clause 19 – not entitled to Cost under Sub-Clauses 19.4. Entitled only for events given in
Sub-Clause 19.1. (ii) – (iv) incl. rebellion, riot, munitions of war.
Clause 17 – Sub-Clause 17.3 & 17.4 - no rectification instructed by the Engineer
• PROJECT COLONY GAS SUPPLY SYSTEM
The Contractor claimed that Gas Supply System is additional to his scope
The Engineer assessed that Gas Supply System is in Contractor’s scope and issued his
Determination under Sub-Clause 3.5 of GCC accordingly.
The Contractor has disputed with the Engineer’s Determination and referred the case to DB
for their decision. DB proceedings are under way.

54. Thank You
53