Syrdarya River basin

Water resources of the Syrdarya River basin

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