Panel of Experts (Hydrology Specialist)

Asian Development Bank (ADB)


Expertise: Panel of Experts – Hydrology Specialist
Expertise Group: Engineering

Consultant Source: International
TOR Keywords Jamrani Multipurpose Project, dams, flood hydrology methodology, reservoir simulations, safety review of dams, design of dams, roller compacter concrete dam, climate change impact assessment, 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 be among 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 Hydrology Specialist with ample experience in hydrologic assessment for large dams is needed for
review of flood hydrology, reservoir yield and climate change impacts and adaptations. The hydrology
review includes the hydro-meteorological assessment and flood routing of the inflow design flood and
sizing of spillway facilities as well as water supply reliability/security against hydrological
variability. The expert will review and advise on models prepared by PIU. The expert will review the
hydrologic design assumptions for the spillways and flood control structures.

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) To review the flood hydrology methodology and computations for determining the design inflow
hydrographs for planning river diversion during construction;
(ii) To review the flood hydrology methodology and computations (up to and including PMP/PMF) for
determining the project design inflow hydrographs for the permanent works, including reservoir routing
and spillway sizing;
(iii) To review the reservoir simulations and yield assessment including the optimization undertaken for
reservoir storage/dam height;
(iv) To consider the impacts of climate change on flood estimates and yield, including undertaking
downscaling if needed
(v) To support with dynamic adaptive pathway planning analysis if needed
(vi) To review the final Reference Design and specifications for design adequacy.

Minimum Qualification Requirements

The Hydrology Specialist shall have as a minimum a Master’s degree or equivalent in water resources,
hydrology or engineering with at least 20 years of experience undertaking flood estimates including PMP
and PMF, reservoir yield estimates, climate change assessments and general hydrologic engineering of
large dams and reservoirs. 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:
• Expertise in hydrological assessment of large dams including extreme flood estimates and reservoir
• Experience of using latest software and programs in hydrology, flood routing and reservoir operation.
• Expertise in climate change impact assessment.

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