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 646 thousand 827 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

220

235.371

1972

Darlık

97

107.500

1989

Elmalı 1 & 2

15

9.600

1893-1950

Terkos

142

162.241

1883

Alibeyköy

36

34.143

1972

Büyükçekmece

100

148.943

1989

Sazlıdere

55

88.730

1998

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

>75

6.231

1995-1997

Kazandere

100

17.424

1997

Pabuçdere

60

58.500

2000

Yeşilçay

145

 -

2004

Melen

575

 -

2007-2014

Yeşilvadi Regulator &
Şile Caisson Wells

10

  - 

1992

Water from Wells and Springs 40 - 1994-2006
Sakarya Regulator 150 - 2014

Total

1.820

868.683