Istanbul Reservoir Levels Rise Above 40% After Recent Rainfall
💧 Istanbul reservoir levels rise above 40% after recent rainfall
Recent rains in Istanbul have significantly increased water levels in the city’s reservoirs. According to the Istanbul Water and Sewerage Administration (ISKI), the average reservoir level has reached 40.48%, continuing to recover after falling to 17.12% on December 7, 2025.
Since the beginning of the year, 207.36 mm of rainfall has fallen across the city’s water bodies, boosting reservoir levels by 6.75% over the past 14 days.
📉 despite rise, current level remains second‑lowest in past decade
📊 Water levels in individual reservoirs
- Ömerli — 56.64%
- Darlık — 58.75%
- Elmalı — 89.46%
- Terkos — 25.84%
- Alibey — 34.23%
- Büyükçekmece — 29.19%
- Sazlıdere — 25.44%
- Istrancalar — 74.42%
- Kazandere — 39.42%
- Pabuçdere — 23.42%
📦 total capacity: 868.68 million m³ 💧 current volume: 351.32 million m³
🚰 external water supply (2026)
Melen system: 94.57 million m³ Yeşilçay: 41.81 million m³ total external: 136.38 million m³
📆 daily consumption (Tuesday): 2.996 million m³
⚠️ Despite the recent rise in water levels due to rainfall, the current level remains the second‑lowest in the past decade, highlighting ongoing concerns about Istanbul’s water supply.
📆 decade context
On December 7, 2025, reservoirs hit a critical 17.12% – the lowest point in recent years. The current 40.48% is an improvement, yet still below the 10‑year February average (≈52%).
📊 Source: İSKİ (Istanbul Water and Sewerage Administration) · data as of 18 feb 2026
© 2026 – Istanbul reservoir monitoring · published feb 2026
🌧️ cumulative rainfall 2026: 207.36 mm
