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Common water resources of Syrdarya river are 37.2 km3 from which transboundary waters — 27.6 km3, from which operates and allocates by ICWC — 21.1 km3. Especiality of water resources of Syrdarya river that return flow, which appears back to river achieves in average year 70% from intake to uppershed reservoirs (it include also side flow of some small rivers). Presence of this return flow permits to satisfact in multiwater and average year requirement of the water management subregion without multiyear regulation and only in low-water year we need to involve reserves of water from them.
Average multi-year resources of transboundary river flow
in the Syrdarya river basin (km3/year)
Source, river basin |
The state, where it is formed |
Total |
Kyrgyzstan |
Kazakhstan |
Tajikistan |
Uzbekistan |
the Syrdarya basin |
Total |
Transb. |
Total |
Transb. |
Total |
Transb. |
Total |
Transb. |
Total |
Transb. |
Naryn |
14.544 |
12.831 |
— |
— |
— |
— |
— |
— |
14.544 |
12.831 |
Karadarya |
3.921 |
2.060 |
— |
— |
— |
— |
— |
— |
3.921 |
2.060 |
Rivers of Fergana valley |
6.040 |
5.400 |
— |
— |
0.855 |
0.700 |
0.910 |
0.800 |
7.805 |
6.900 |
Rivers of midstream |
— |
— |
— |
— |
0.150 |
— |
0.145 |
— |
0.295 |
— |
Chirchik |
3.100 |
3.100 |
0.749 |
0.749 |
— |
— |
4.100 |
2.000 |
7.949 |
5.849 |
Akhangaran |
— |
— |
— |
— |
— |
— |
0.659 |
— |
0.659 |
— |
Keles |
— |
— |
0.247 |
— |
— |
— |
— |
— |
0.247 |
— |
Arys |
— |
— |
1.183 |
— |
— |
— |
— |
— |
1.183 |
— |
Rivers of downstream |
— |
— |
0.600 |
— |
— |
— |
— |
— |
0.600 |
— |
Total, km3, the Syrdarya river basin (%) |
27.605
(100) |
23.391
(84,7) |
2.426
(100) |
0.749
(30,9) |
1.005
(100) |
0.700
(69,7) |
6.167
(100) |
2.800
(45,4) |
37.203
(100) |
27.640
(74,3) |
Share of states, % |
74.2 |
84.6 |
6.5 |
2.7 |
2.7 |
2.6 |
16.6 |
10.1 |
100 |
100 |
General water balance of transboundary rivers in the Syrdarya basin, km3/year
Items |
Humid year (10%) |
Average
humidity year (50%) |
Dry year (90%) |
Inflow to reservoirs
(Toktogul, Andijan, Charvak) |
28.5 |
21.1 |
15.8 |
Lateral inflow minus flow losses |
15.5 |
14.9 |
13.3 |
Flow regulation by reservoirs
(+ filling, – release) |
+4.0 |
0 |
–3.5 |
Total water diversion from the rivers |
32.0 |
32.0 |
29.3 |
including from Naryn and Syrdarya |
21.5 |
21.5 |
18.8 |
Release to the Aral Sea |
8.0 |
4.0 |
3.0 |
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