Egrekkaya Dam
| Egrekkaya Dam | |||||||||
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| Coordinates | 40 ° 29 ′ 41 ″ N , 32 ° 39 ′ 57 ″ E | ||||||||
| Data on the structure | |||||||||
| Lock type: | Sand-gravel embankment with a clay core | ||||||||
| Construction time: | 1985-1992 | ||||||||
| Height above valley floor: | 67 m | ||||||||
| Height above foundation level : | 100 m | ||||||||
| Building volume: | 3 900 000 m³ | ||||||||
| Data on the reservoir | |||||||||
| Water surface | 3.95 km² | ||||||||
| Storage space | 113 million m³ | ||||||||
The Eğrekkaya Dam ( Turkish Eğrekkaya Barajı ) is located 3 km north of the city of Kızılcahamam , 70 km northwest of the Turkish capital Ankara in the province of the same name .
The Eğrekkaya Dam was built between 1985 and 1992 to supply drinking water to the Ankara metropolitan area on the Sey Çayı. The Sey Çayı flows 2 km below the dam into the Bulak Çayı , which later joins the Bayındır Çayı to form the Kirmir Çayı , a tributary of the Sarıyar dam through which the Sakarya flows .
The barrier structure is a sand-gravel embankment with a clay core . The dam height above the valley floor is 67 m and 100 m above the foundation base. The dam volume is 3.9 million m³. The reservoir covers an area of 3.95 km². The storage volume is 113 million m³. The Eğrekkaya Dam supplies 79 million m³ of drinking water per year.