
According to İSKİ's data as of September 14, 2026, the general occupancy rate of dams in Istanbul decreased to 39.28 percent.
AI-generated summary
The occupancy rates of the dams that meet Istanbul's water needs are decreasing with summer heat and increasing consumption.
In its updated statement, Istanbul Water and Sewerage Administration (ISKİ) shared the recent change in dam occupancy rates in Istanbul. So, what is the occupancy rate of Istanbul dam on September 14, 2026?
CURRENT DAM OCCUPANCY RATES 14 SEPTEMBER 2026
According to the official data shared by İSKİ as of Monday, September 14, 2026, the general average occupancy rate of the dams that meet Istanbul's water needs has decreased to 39.28 percent. The fact that the general average, measured as 58.68 percent in mid-July, entered a rapid downward trend with the beginning of September, clearly reveals the high evaporation and increased water consumption caused by summer heat.
While the Ömerli and Elmalı dams on the Anatolian Side continue to bear the city's water load, the occupancy rates in the western basins such as Istrancalar, Pabuçdere and Sazlıdere on the European Side have fallen below critical levels.
14 SEPTEMBER 2026 DAM FULL RATES
According to İSKİ's latest hydraulic measurements dated September 14, dam-based occupancy rates are as follows:
Ömerli Dam: 54.99 percent
Darlık Dam: 58.92 percent
Elmalı Dam: 67.54 percent
Terkos Dam: 35.26 percent
Alibey Dam: 37.7 percent
Büyükçekmece Dam: 28.52 percent
Sazlıdere Dam: 23.09 percent
Istrancalar Dam: 26.45 percent
Kazandere Dam: 16.05 percent
Pabuçdere Dam: 6.61 percent

Hundreds of large fish washed ashore in Çanakkale Ayvacık Dam. District Agriculture and Forestry Directorate teams took samples from water and fish.

AICU Faculty Member Prof. Dr. Faruk Kaya stated that after the glacier disaster in Nepal, the skullcap glacier on Mount Ararat decreased from 15 square kilometers in the early 1900s to 5 square kilometers today, and warned against the increasing risk of melting and avalanches.
Between 1 October 2025 and 31 August 2026, an average of 709.2 kg of precipitation per square meter fell across Türkiye, the highest level of the last 66 years. Precipitation increased by 29 percent compared to normal.

General Directorate of Meteorology (MGM) announced that showers and thunderstorms were expected in some parts of the country and issued a heavy rain and wind warning for Zonguldak, Bartın, Düzce and Sakarya.

On September 14, 2026, 24 earthquakes occurred in Türkiye and its surroundings from 00:20:37 to 07:53:09. The largest earthquake occurred on the island of Crete at 01:05:07 with a magnitude of 3.4. Earthquakes were recorded and shared instantly by AFAD and Kandilli Observatory.

Temperatures in Europe and Türkiye continue to remain above seasonal norms due to the El Nino weather phenomenon. In mid-September, 43 degrees were measured in Adana. Long-term forecasts show the possibility of increased precipitation in southern and western Europe in October, with temperatures remaining above normal. While cold air inflows are expected in the second half of November, the warm air effect may cause rain instead of snow in December and January. While snowfall may remain below average in western and low-lying parts of Türkiye, snow potential will remain high in Eastern Anatolia due to the high altitude. The winter character in Istanbul and Marmara may be short and effective cold waves between warm periods rather than long-term cold.