Trend
Siltation of HPP reservoirs
Source: unofficial: test dataUpdated: 18.10.2026 · form of 01.09.2026
VII.6
Impacts
Unofficial data only
Siltation of HPP reservoirs
Name in the form: Degree of reservoir siltation, t/km²/year or % of initial volume/year
Period
- Form 1-IK
- Unofficial
Siltation of HPP reservoirs
32.5
% of volume
+1.5
vs 2021
- Unit
- % of volume
- Frequency
- Annually
- Area
- Impacts
- Section
- VII · Energy
- Agencies
- MEWR Barqi Tojik OSHC
Not filled in on the form; test series.
Data
Values by year
| Year | Value% of volume | Source and note |
|---|---|---|
| 2021 | 31.0 | Test |
| 2022 | 31.4 | Test |
| 2023 | 31.8 | Test |
| 2024 | 32.1 | Test |
| 2025 | 32.5 | Test |
Source data
Value in Form No. 1-IK
Not filled in.
Quality
Data remarks
No remarks.
Methodology
Indicator metadata
- Definition
- An indicator of the extent to which the basin of a reservoir is filled with river sediments (silt, sand, clay), leading to a loss of its useful water volume and a rise of its bed.
- Calculation method
- The degree of siltation is calculated as the ratio of the silted volume to the initial volume of the reservoir, expressed as a percentage, and is determined on the basis of hydrographic surveys, echo sounding or calculations of river sediment discharge. The indicator is calculated annually, as well as after major floods and mudflows.
- Institution responsible for calculation
- Ministry of Energy and Water Resources of the Republic of Tajikistan; Open Joint-Stock Holding Company “Barqi Tojik”