Expertise: Hydrologist
Expertise Group: Engineering
Consultant Source: National
TOR Keywords: Hydrologist, Irrigation
Objective and Purpose of the Assignment
The specialist will support an international hydrologist and relevant consultants for preparation of the
proposed Ayakchi reservoir project and Obizarang reservoir project in the Amu Darya River basin in
Uzbekistan to confirm technical viability and to ensure the quality design of the project as suitable
adaptation measure under the climate change.
Scope of Work
The specialist will support an international hydrologist and relevant consultants for data collection,
technical due diligence for the Ayakchisay river basin and Obizarang river basin. The specialist’s
intermittent inputs will be delivered over an approximately 5-month period.
Detailed Tasks and/or Expected Output
The specialist’s activities are expected to include but not be limited to:
- Review the draft feasibility report for the Ayakchi reservoir project and the Obizarang reservoir
project prepared by the government of Uzbekistan, and identify necessary additional data collection and
data verifications required for the dam design and the irrigation system. - Conduct data collection (recent and historical) and data verifications related to precipitation in
the target river basins, water levels and discharges along the river systems, using a high resolution
Digital Elevation Model (DEM) as well as characteristics of river basins by conducting field studies,
communicating with the relevant authorities and local/regional institutions, etc. The remote sensing
global data shall be used to supplement the lack of dataset. If necessary, the ground truthing methods
and correlation to similar/neighboring will be considered. - Develop hydrological and hydraulic models for the target river basins and reservoirs, using the data
as described above. The hydrologic model should also simulate relevant snow accumulation and melt. The
computed output needs to be verified based on the historical observation data. The assumptions,
discrepancies, uncertainties as well as limitations should be clearly described. Once the model has been
verified for historical conditions, medium- and long-term climate change scenarios (SSP3-7.0 and SSP5-
8.5) for inflows, sedimentation, flood return periods, and extreme dry periods should be conducted to
assess technical viability under changing climate conditions. - Conduct the following scenario simulations and analyses using the verified models: (i) Inflow under
various hydrological conditions; (ii) flood flow propagation and inundation along downstream reach of
the dam under the flood conditions with various return periods; (iii) reservoir storage and filling
using hydraulic model based on the predicted inflows by the hydrological model and the planned outflows
for irrigation and other purposes. The planned outflow volume shall be examined properly, and necessary
adjustment shall be made; (iv) provision of input for water requirements and balance study for assessing
impact for irrigation systems; and (v) any other analysis by using the verified models should be
conducted if needed for checking technical viability. - Collect information about the irrigation and drainage systems such as inventory of existing
facilities, institutional setup, management, operation, maintenance arrangements, and upgrading plans.
The specialist will also collect topographic information using remote sensing data for the additional
irrigation areas that will be included in the extended command area of the projects. - Support to any other tasks assigned by the project officer. The specialist may recruit and supervise
a research assistant under this contract to support the assigned work.
Minimum Qualification Requirements
The specialist should be a graduate, preferably post graduate, degree in engineer, hydrology, water
resources, irrigation, flood management, or a related discipline. He/she has at least 7 years of
professional experience, civil engineering in the field of river basin management or water resources
management. The well-knowledge with hydrology and hydrometrics model including reservoirs and the
regional or experience in the central Asian region will be preferred.
Minimum General Experience: 7 Years
Minimum Specific Experience (relevant to assignment): 7 Years
