Panel of Experts (Dam Specialist/Chair)

Asian Development Bank (ADB)


Expertise: Panel of Experts – Dam Specialist/Chair
Expertise Group: Engineering

Consultant Source: International
TOR Keywords: Jamrani Multipurpose Project, dams, safety review of dams, design of dams, roller compacter concrete dam, Uttarakhand, Uttarakhand Irrigation Department

Objective and Purpose of the Assignment

ADB is supporting the State Government of Uttarakhand to prepare the Jamrani Multipurpose Project that
will (i) construct a 130-meter-high roller compacter concrete (RCC) dam across the Gola River, about 10
kilometers upstream of Haldwani, Uttarakhand, (ii) construct a 14-megawatt (MW) hydropower plant at the
toe of the dam, (iii) construct a drinking water supply system for Haldwani, and (iv) modernize an
existing irrigation system in Uttarakhand. The project benefits will include (i) provision of 117
million liters per day (MLD) of raw drinking water for Haldwani, (ii) increase water availability for
150,027 hectares (ha) cultivable command area (CCA) which includes 32,556 ha in Uttarakhand and 117,471
ha in Uttar Pradesh, and generation of 14MW of hydropower. The project feasibility study was completed
by the state of Uttarakhand and statutory clearances obtained at both state and central government
level. The project’s executing agency is the Uttarakhand Irrigation Department (UID), under which a
project implementation unit (PIU) has been established for delivering this project. The state government
has prepared a detailed project report (DPR) for the dam project along with site investigations and
preliminary design of the diversion structures and dam structures.

For the dam component, a panel of experts (POE) will be established for undertaking independent safety
review of the new dam. The objective of the POE is to provide an independent review of the
investigation, design and construction of the dam, and the start of operations and to recommend on the
required actions to ensure the safety of the dam and associated facilities to acceptable standards as
per ADB’s, World Bank’s, and Government of India’s requirements. The POE will provide due consideration
to the administrative procedure/guidelines of the Government of India, ADB, and the World Bank’s
safeguard policy OP4.37.

Scope of Work

The expert will function as the chair of a panel of experts (POE) that ADB will recruit to assist the
state government with finalizing the design of the dam and preparing the bid documents for construction
of the dam. Initially, this assignment will focus only on the investigation and design activities for
the proposed dam. The POE will undertake periodic, comprehensive, and independent reviews with the
objective of evaluating features and actions pertaining to engineering and dam safety and providing
recommendations to the PIU and ADB of actions that may be needed to design and construct the dam and
appurtenances to acceptable safety standards. The POE will review the tender documents for the dam,
including the final Reference Design, Employer’s Requirements, and technical specifications (for
procurement via an EPC route) before tendering commences. The POE may also provide advice to the bid
evaluation committee.

A Dam Specialist with significant experience in the design and construction supervision of roller
compacted concrete (RCC) dams including ones in high seismic zones. In particular, the review will
include material selection, RCC mix design, design and construction quality control manuals,
construction planning, dynamic stability / stress-strain analyses of dams, dam instrumentation,
emergency preparedness planning and dam break studies.

The overall scope of work of the POE is provided in the attachment.

Detailed Tasks and/or Expected Output

While the POE will review and evaluate mainly technical elements of the dam designs, they shall not be
concerned with the project scope, general features or economic characteristics. The specific elements to
be reviewed and evaluated by the POE shall include but not be limited to the following:

Tender Preparation Phase
(i) Review the Detailed Project Report (DPR) and all other available information (feasibility studies,
site investigations, hydrologic reports, etc.). Highlight gaps in information and identify any possible
issues that will require addressing to ensure the design of the dam, its appurtenance’s, and the
reservoir’s design meets with international best practices.
(ii) Assist the PIU and ADB project team by making recommendations on additional studies, design changes
and design development required to finalise the Reference Design and bidding documents. Prepare
individual advisory notes to guide/inform the additional studies and design changes.
(iii) Review the Reference Design and bidding documents.
(iv) Review the overall safety standard and criteria, considering the potential risk of the dam and
consequences, as well as the national regulations and international standards and practices;
(v) Review the Reference Design of the foundation treatment, proposed excavation, selected foundation
strength parameters and seepage control measures;
(vi) Review the selected aggregate source, cement type, and material characteristic for conventionally
vibrated concrete and roller compacted concrete structures including results of durability, gradation
and reactivity tests, trial mix designs, strength design parameters, and construction requirements;
(vii) Review the result of the seismic hazard assessment and appropriateness of the seismic safety
design criteria and analyses and assess any additional needs for seismic hazard assessment;
(viii) Review stability analysis and resulting factors of safety for normal, unusual and extreme loading
conditions for the dam and associated structures, spillways/energy dissipating structures and outlet
(ix) Review upstream conditions in regard to formation of reservoir landslide dams if any and handling
of floods caused by the collapse of such natural dams;
(x) Review the reservoir related factors, such as reservoir rim slope stability, resulting wave action,
their effect on dam stability, potential seepage, handling of debris, etc.;
(xi) Review the flood hydrology methodology and computations for determining the project design inflow
hydrographs, reservoir routing and spillway sizing;
(xii) Review the modelling studies and Reference Design of spillway facilities including flow
conditions, energy dissipation or need for modeling;
(xiii) Review the inlet and outlet works Reference Design, including its hydraulic designs, capacity for
emergency reservoir drawdown, sediment handling capability, selective thermal releases, regulation range
and other factors;
(xiv) Review the Reference Design of diversion works, schedule, hydrology and risk factors associated
with diversion during construction and with the closure of diversion works at initial reservoir filling;
(xv) Review the risk and hazard evaluations including need for dam breach analysis and inundation study
as part of the Emergency Preparedness Plan;
(xvi) Review the Reference Design for dam instrumentation and the program for collecting, evaluation and
maintaining data to be obtained as well as preliminary operation and maintenance plan; and
(xvii) Review the final Reference Design and specifications for design adequacy, construction,
scheduling as well as the owner’s quality control procedures and construction supervision plan.

Minimum Qualification Requirements

The Dam Specialist / POE Chair will have preferably a Master’s degree in Engineering with at least 20
years of experience in preparing, designing and implementing dam projects, good knowledge of dam
construction methods (particularly RCC dams with heights more than 100 meters), and sound knowledge of
best international practices for dam engineering and dam safety for RCC dams. Ideally the specialist
will have work experience with ADB or the World Bank and/or participation in a Panel of Experts.

POE Criteria for Selection:
• Having worked as an expert in designing and construction of large dams.
• Intensive knowledge and experience in RCC dam design and construction arrangement, procedures and
quality control.
• Intensive experience in preparing construction plan and schedule for large-scale or complex works
including RCC dam.
• Sound knowledge of seismic design and design of structures in high seismic zones
• Sound knowledge of analyzing monitoring data collected during the construction and operation phases.
• Intensive knowledge of dam safety assurance programs and emergency preparedness planning

Minimum General Experience: 20 Years
Minimum Specific Experience (relevant to assignment): 20 Years