MOHMAND DAM HYDROPOWER PROJECT
DT-2 Tunnel Shuttering
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Project Background
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PROJECT BACKGROUND
Reconnaissance Study 1969
Pre-Feasibility Study 1992
JICA Feasibility Study 2000
Tender Design & Tender Documents 2017
Construction Contract Award March 2019
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Key Project Objectives
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MULTI-PURPOSE DAM AND HYDROPOWER PROJECT
Power
Generation
Water Supply Development
to Peshawar of Irrigation
City Canals
Agriculture
Flood Development
Mitigation
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KEY OBJECTIVES
FLOOD PROTECTION
Munda Headworks – 2010 Flood
Munda Headworks - reconstructed
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PUBLIC WELFARE PROJECTS
Education Institutes Road Infrastructures
Health Institutes
Drinking Water Tree Plantation Employment Opportunities
Benefits to Local Communities and Stakeholders
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Project Layout and Features
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SALIENT FEATURES
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 1.7km long & 15m diameter
Power Generation Capacity 800MW from 4 x 200MW Francis Turbines
Cultivable Command Area 18,237 Acres
Right Bank Irrigation System 3.6 Km Tunnel + 11.7km Canal
Left Bank Irrigation System 4.8 Km Tunnel + 12.4 km Canal
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CFRD DAM & SPILLWAY
Dam & Spillway – looking at
upstream
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CFRD DAM & SPILLWAY
Dam & Spillway – view
looking downstream
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Milestones Achieved
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PROJECT INAUGURATION MAY 02, 2019
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PROJECT – 1ST CONCRETE
Project Colony – February 2020
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GROUND BREAKING FOR TUNNELLING WORKS
Main Access Tunnel - May 2020
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MAIN DIVERSION TUNNEL EXCAVATION START
Diversion Tunnel 1 - August 2020
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MAIN DIVERSION TUNNEL EXCAVATION START
Diversion Tunnel 2 - October 2020
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10 BILLION TREE PLANTATION CAMPAIGN
August 2020 – ongoing….
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The Project Site
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CONTRACTOR’S FACILITIES
Contractor’s Camp and Office
Crushing Plant 22
PROJECT COLONY
Colony Mosque WAPDA Project Office
Senior Officers Hostel 23
DIVERSION TUNNELS INLETS
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DIVERSION TUNNELS
Tunnel Excavation Works
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DIVERSION TUNNELS OUTLETS
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DIVERSION TUNNELS OUTLETS
Assembly of Tunnel Lining Mobile Shutters
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DIVERSION TUNNEL OUTLET
Assembly of Tunnel Lining Formwork
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DIVERSION TUNNEL LINING
First Concrete in Diversion Tunnel -2
February 2022
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SPILLWAY
Lower Stilling
Basin
Upper Stilling
Basin
Spillway Crest looking 30
SPILLWAY
Spillway Crest Spillway – Lower Basin
180m cut slope
Upper Stilling
Basin
Lower Stilling
Basin
Flow
Spillway – looking upstream from the Right
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POWER INTAKE
Power Intake – cut
slope with high capacity
post tensioned anchors
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POWERHOUSE AREA
Switchyard Platform
Powerhouse cut slope
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POWER INTAKE & DT INLET WORKS
View from Todobo Quarry
Power Intake Project Colony
Works
DT – Inlet
Works
Main Dam fill stockpile -
hardstanding
Haul Road Bailey Bridge 34
Project Challenges
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PROJECT CHALLENGES
213 m CFRD DAM Situation:
5th highest CFDR in the World at 213 m
Seismic area
17M m3 of rockfill required from local
source
Actions:
Experienced designers and Contractor
Detailed investigations and testing of rockfill
materials from local quarry
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PROJECT CHALLENGES
SPILLWAY
Situation:
PMF Flood capacity = 27,500 m3
High head = 215m for PMF to Riverbed level
and 600m long
Actions:
Double stilling basin arrangement
Extensive hydraulic model testing
PMF
215m
high
600m long
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PROJECT CHALLENGES
GEOLOGY
Situation:
Across the Site – generally, tectonically
deformed Schist with foliations with weak
zones
Actions:
Exacting site investigation to understand the
geology and geotechnical parameters for the
Project design
Real-time feedback loop during tunnelling
and surface excavations works to designers
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PROJECT CHALLENGES
DIVERSION TUNNELS
Situation:
2 x 17.0m excavated diameter both 1.7km long
Encountering weaker zones in foliated Schist
Actions:
Prudent real time interpretation of tunnel face
conditions – with forward drilling to test rock
conditions
Engineer and Contractor working together at
the tunnel face
Outcome:
DT-1 header completed - breakthrough Dec
2021
DT-2 header nearing completion 39
PROJECT CHALLENGES
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 of each
bench
Engineer and Contractor working together at
each bench for detailed assessment of support
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SITE HEALTH AND SAFETY
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Public Welfare Projects
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MEDICAL CAMPS
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FREE COMMUNITY TRANSPORT
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SOLARIZATION OF MOSQUES & SCHOOLS
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COMMUNITY INFRASTRUCTURE
DEVELOPMENT
Uplift of local communities through construction of schools and rural
roads
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SPORTS / YOUTH ENGAGEMENT
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Collaborations of Experience and Capabilities
- Driving the delivery of the Mohmand Dam Hydropower Project
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PROJECT CONSULTANTS GROUP
MDC
G
In Association with:
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MOHMAND DAM CONTRACTOR
China Gezhouba Group Co., DESCON Engineering
Ltd, Ltd, Pakistan
China
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Collaboration delivering the Project
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Thank You
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