The storm and heavy downpour that were effective in Istanbul caused disruptions in city life while also significantly increasing water levels in the dams. According to data shared by the Istanbul Water and Sewerage Administration (ISKI) on the morning of October 15, 2026, the general dam occupancy rate in the city rose from around 38 percent to over 45 percent in one day.
Beykoz stood out among the regions where the rainfall was recorded as the most intense. While flooding and transportation problems were experienced across the city, the rainfall falling on the dam basins caused a rapid increase in water reserves.
LATEST STATUS IN DAMS
According to ISKI data, the occupancy rate in Elmalı Dam rose from the 77.79 percent level measured the day before to 100 percent. While the rate in Istrancalar Dam rose from 43.73 percent to over 84 percent, the occupancy in Alibey Dam reached approximately 68 percent from 34.44 percent.
Occupancy in Ömerli Dam rose from 54.25 percent to the 62 percent level, and in Darlık Dam from 59.91 percent to the 68 percent level. Increases were also observed in the Büyükçekmece, Terkos, and Sazlıdere dams.
| Dam | Previous level | October 15 level |
|---|---|---|
| Elmalı | %77.79 | %100 |
| Istrancalar | %43.73 | Over %84 |
| Alibey | %34.44 | Approx. %68 |
| Ömerli | %54.25 | Approx. %62 |
| Darlık | %59.91 | Approx. %68 |
| Büyükçekmece | %26.04 | Approx. %29 |
| Terkos | %30.57 | Approx. %34.5 |
| Sazlıdere | %20.16 | Approx. %27 |
Among the other sources in the city, occupancy in Kazandere Dam rose to approximately 8.5 percent, and in Pabuçdere Dam to the 3.3 percent level. Although the rainfall provided a strong recovery in Istanbul's water resources in a short time, it was observed that occupancy rates in some dams still remained at low levels.
News Source: 12punto
