Water Resources

İstanbul is supplied with only surface water resources. Water from rainfall times are collected in dams and regulators, and then supplied to the city upon necessary treatment processes. To meet the increasing water demand in İstanbul due to population increase and geographical expansion of service areas, potable water is provided from a long range of water basins extending from Tekirdağ on the European side to Düzce on the Asian side.

An average of 2 million 733 thousand 388 m³ of water is consumed in İstanbul in a day. Melen, which is among of the water resources of Istanbul, takes water from Sakarya River and Yeşilçay system.

 

Water Resources in Istanbul

Water Resource

Annual Yield
(Million m³)

Max. Collection Volume
(Million m³)

Opening Year

Ömerli Dam

220

235.371

1972

Darlık Dam

97

107.500

1989

Elmalı 1 and 2 Dams

15

9.600

1893-1950

Terkos Dam

142

162.241

1883

Alibeyköy Dam

36

34.143

1972

Büyükçekmece Dam

100

148.943

1989

Sazlıdere Dam

55

88.730

1998

Istrancalar (Düzdere, Kuzuludere,
Büyükdere, Sultanbahçedere, Elmalıdere)

75

6.231

1995-1997

Kazandere Dam

100

17.424

1997

Pabuçdere Dam

60

58.500

2000

Yeşilçay Regulator

145

 -

2004

Melen 1 and 2 Regulators

575

 -

2007-2014

Yeşilvadi Regulator 

10

  - 

1992

Şile Caisson Wells 30 - 2006

Total

1 Billion 660 Million m³/ Year

868.683