LIBYAN I

ARABJAMAHIRIYA

00,

Jawf

Hydrography

IMO Lake, reservoir

River

Intermittent river

Basin boundary

River flows

Site of flow measurement(number raterences stakon tha tatke or graphsl

Key gauging station

Subsidary gauging station

Es ¡mate from public sources

Magnitude of annual flow [km1

< 3

3 to< 5

5 to< 10

10 to< 20

20 to< 40

40 to< 60

60 to< 85

Annual precipitation [mm]

50 mm isohyet

200 mm isohyet

Legend

Administration

Country boundary

Country boundary in dispute

0 Capitat, major city

5'303,

CENTRAL AFRICANREPUBLIC

Bahr el Aral,

...............'

SUDAN

Mediterranean Sea

EGYPT

Bukawu

Bujumbura'

Alexandria

DEMOCRATIC

REPUBLICOF THE CONGO,

AL Jizah.*.

5U 1U0 2U0 JOU km

43 Lambart contormat coma promcnon IWGS 12E41 BURUNOIStandard parattats 25°N and 2°N - Cantrat mandlan 32°E

, A

Ca i ro

,S,

,.

RWANDA Kigali \/ \

.........

Khartoum

....::":

....:.

'... Asw5n

;...'Lake **.

Nasser ...

M' SYRIAN ARABISRAEL ----REPUBLIC

,lerusale *Amman

(-4 it4

_ JORDAN

.. .....

7 1

1

t

(/Port Sudan

)

s)

ERITREA

LakeVietaria

Nairobi

Lake \_ 13:

Addis Ababa

7---z» UNITE!) REPUBLItOF TANZANIA

SAUDI ARABIA

Asmara

ETHIOPIA

a KENYA

IRAQ

Medina

Jiddah

'Mecca

HYDROLOGIC REGIME IN THE NILE BASIN Mean annual flow of the Nile and main tributaries upstream of Lake Nasser

Information Products for Nile Basin Water Resources Management GCP/INT/945/ITA

burundi d.r.congo egypt eritrea ethiopia kenya rwanda sudan u.r.tanzania uganda

DisclaimerThe designations employed and the presentation of material in the map do not imply the expression of any opinion whatsoever on the part of FAO concerning the legal or constitutional status of any country, territory or sea area, or concerning the delimitation of frontiers.

www.fao.org/nr/water/faonile

A project sponsored by the Government of Italy

The project attempted to strengthen the ability of the governments of the Nile Riparian Statesto take informed decisions on water resources policy and management matters regardingthe common Nile resource. It included a major capacity building component. The projectwas implemented under the umbrella of the Nile Basin Initiative.

Nr

21

22

23

24

25

26

27

28

29

30

Setit at Kurbur

Atbara at Wad el Hiliew

Rahad at mouth

Akabo (incl. Gilla & Mokwa)

Pibor

Bahr el Ghazal (K. Dolieb)

Bahr el Arab

Pongo

Tonj

Aswa

-

-

1908 - 1997

-

-

1937 - 1964

-

-

1944 - 1985

1940 -1977

7.0

4.0

1.1

2.8

1.0

0.3

0.3

0.6

1.4

3.0

1

2

3

4

5

6

7

8

9

10

River and Station Name

Main Nile at Dongola

Atbara at mouth

Main Nile at Tamaniat

Blue Nile at Khartoum

White Nile at Mogren

Dinder at mouth

Blue Nile at Diem

White Nile at Malakal

Sudd Outflow

Sobat at Hillet Dolieb

Data Period

1890 - 1995

1903 - 1994

1911 - 1995

1900 - 1995

1911 - 1995

1907 - 1997

1912 - 1997

1905 - 1997

1905 - 1983

1905 - 1983

Avg Ann Flow[km3]

84.1

11.1

72.7

48.3

26.0

2.8

48.7

29.7

16.1

13.5

16

17

18

19

20

11

12

13

14

15

Lake Albert outflow

Semliki at mouth

Lake Kyoga outflow

Lake Victoria outflow

Kagera at Kyaka Ferry

Baro at Gambeia

Baro at mouth

Lol at Nyamlel

Jur at Wau

Bahr el Jebel at Mongalla

1940 - 1977

1940 - 1977

1940 - 1977

1940 - 1977

1940 - 1978

1905 - 1959

1929 - 1963

1944 - 1985

1942 - 1986

1940 - 1977

32.8

4.6

28.6

28.6

6.3

13.2

9.5

3.2

4.5

36.0

Mean monthly flow in cubic kilometers (km3) at key stations (numbers indicated on map)

Mean annual flow in cubic kilometers (km3) at key stations (numbers indicated on map)

0

5

10

15

20

J F M A M J J A S O N D

0

5

10

15

20

J F M A M J J A S O N D

0

5

10

15

20

J F M A M J J A S O N D

Lake VictoriaOutflow(1940 - 1977)

19

Khartoum(Blue Nile)(1900 - 1995)

4

Sudd Outflow(1905 - 1983)

9

0

5

10

15

20

J F M A M J J A S O N D

0

5

10

15

20

J F M A M J J A S O N D

0

5

10

15

20

J F M A M J J A S O N D

Atbaraat Mouth(1903 - 1994)

2

Blue Nile at Diem(1912 - 1997)

7

White Nile at Mongalla(1940 - 1977)

15

0

5

10

15

20

J F M A M J J A S O N D

0

5

10

15

20

J F M A M J J A S O N D

0

5

10

15

20

J F M A M J J A S O N D

Nile atTamaniat(1911 - 1995)

3

White Nile at Malakal(1907 - 1995)

8

Lake Albert Outflow(1940 - 1977)

16

0

5

10

15

20

J F M A M J J A S O N D

0

5

10

15

20

J F M A M J J A S O N D

0

5

10

15

20

J F M A M J J A S O N D

Nile atDongola(1910 - 1995)

1

White Nileat Mogren(1911 - 1995)

5

Sobat Mouth (1905 - 1983)

10

This poster presents the average annual flow of the Nile and its main tributaries upstream of Lake

Nasser. Downstream of this point, no new tributaries join the Nile system after Aswan, and Lake

Nasser outflow is fully regulated. All data presented on this poster has been obtained from Sutcliffe

and Parks (1999) “The Hydrology of the Nile”. When comparing the relative contributions of the various

Nile components, it should be remembered that average annual discharge at key sections was

calculated from flow records of different length and periods. Full details of the basin hydrology are

given in the project ‘Synthesis Report’.

It should also be noted that the 1959 Nile agreement apportions 55.5 km3 to Egypt and 18.5 km3 to

Sudan. This was calculated in proportion to population at the time and based on a mean annual flow of

84 km3 at Dongola/Aswan inflow less 10 km3 of reservoir evaporation.

About this poster