Türkiye's water
Basins: the last five years
Short answer
In the 2025-26 water year the three basins with the highest rain relative to normal were Asi (Orontes) 148%, Eastern Mediterranean 138%, Ceyhan 137%.
The three lowest were Meriç-Ergene 93%, Marmara 97%, Western Black Sea 97%.
One measurement: rain as a share of the 1991–2020 normal (CHIRPS; normal computed by the site). No score, no ranking. Data for 25 basins.
Summary
The 2021-22–2025-26 water years for Türkiye's 25 river basins: rain as a share of normal and its band (CHIRPS), satellite water storage (GRACE), DSİ groundwater potential, dam levels (EPİAŞ), Official Gazette field and closure records and drought records. Measured figures only; no score, no forecast.
The table gives the values of the 2025-26 water year. Each basin's Turkish page has five water years, source and date notes and a citation box. The rain band follows one rule: water-year rain (1 October–30 September) divided by the 1991–2020 average of the same months (CHIRPS; normal computed by the site). Below 80% is low, 80–120% usual, above 120% high. In the 2025-26 water year 0 basins were low, 15 usual and 10 high.
Source: CHIRPS · GRACE · DSİ · EPİAŞ · Resmî Gazete (Official Gazette) · Data as of: 7 November 2026
| Basin | Rainshare of normal, band | Satellite water storagewater-year mean anomaly, cm | Groundwater potentialhm³/year (DSİ) | Dam levellast day and water-year mean, % | Official Gazette fields / closuresnumber of records | Drought recordsOfficial Gazette title records |
|---|---|---|---|---|---|---|
| Meriç-ErgeneH01 | 93% usual | -7.1 cm | no data (DSİ table ends in 2024) | no data (no dam in this basin on the EPİAŞ list) | no record | no record found in Official Gazette titles |
| MarmaraH02 | 97% usual | -8.8 cm | no data (DSİ table ends in 2024) | last 15.5% · mean 43.2% | no record | no record found in Official Gazette titles |
| SusurlukH03 | 111% usual | -12.6 cm | no data (DSİ table ends in 2024) | last 37.5% · mean 51.8% | no record | no record found in Official Gazette titles |
| North AegeanH04 | 130% high | -9.4 cm | no data (DSİ table ends in 2024) | last 9.9% · mean 34.7% | no record | no record found in Official Gazette titles |
| GedizH05 | 115% usual | -13.8 cm | no data (DSİ table ends in 2024) | last 43.2% · mean 48.7% | no record | no record found in Official Gazette titles |
| Küçük MenderesH06 | 110% usual | -10.9 cm | no data (DSİ table ends in 2024) | no data (no dam in this basin on the EPİAŞ list) | no record | no record found in Official Gazette titles |
| Büyük MenderesH07 | 110% usual | -14.6 cm | no data (DSİ table ends in 2024) | last 43.7% · mean 52.3% | no record | no record found in Official Gazette titles |
| Western MediterraneanH08 | 122% high | -11.7 cm | no data (DSİ table ends in 2024) | last 28.4% · mean 43.3% | no record | no record found in Official Gazette titles |
| AntalyaH09 | 136% high | -17.8 cm | no data (DSİ table ends in 2024) | last 68.5% · mean 74.9% | no record | no record found in Official Gazette titles |
| BurdurH10 | 119% usual | -17.1 cm | no data (DSİ table ends in 2024) | no data (no dam in this basin on the EPİAŞ list) | no record | no record found in Official Gazette titles |
| AkarçayH11 | 113% usual | -17.5 cm | no data (DSİ table ends in 2024) | no data (no dam in this basin on the EPİAŞ list) | no record | no record found in Official Gazette titles |
| SakaryaH12 | 101% usual | -14.9 cm | no data (DSİ table ends in 2024) | last 46.2% · mean 45.2% | no record | no record found in Official Gazette titles |
| Western Black SeaH13 | 97% usual | -6.9 cm | no data (DSİ table ends in 2024) | last 27.9% · mean 41.9% | no record | no record found in Official Gazette titles |
| YeşilırmakH14 | 123% high | -4.3 cm | no data (DSİ table ends in 2024) | last 68.8% · mean 77.5% | no record | no record found in Official Gazette titles |
| KızılırmakH15 | 115% usual | -10.4 cm | no data (DSİ table ends in 2024) | last 60.4% · mean 63.1% | no record | no record found in Official Gazette titles |
| Konya ClosedH16 | 121% high | -19.7 cm | no data (DSİ table ends in 2024) | no data (no dam in this basin on the EPİAŞ list) | no record | no record found in Official Gazette titles |
| Eastern MediterraneanH17 | 138% high | -20.6 cm | no data (DSİ table ends in 2024) | last 45.8% · mean 68.2% | no record | no record found in Official Gazette titles |
| SeyhanH18 | 129% high | -22.2 cm | no data (DSİ table ends in 2024) | last 55.1% · mean 64.1% | no record | no record found in Official Gazette titles |
| Asi (Orontes)H19 | 148% high | -29.7 cm | no data (DSİ table ends in 2024) | last 65.4% · mean 79.8% | no record | no record found in Official Gazette titles |
| CeyhanH20 | 137% high | -26.8 cm | no data (DSİ table ends in 2024) | last 62.1% · mean 70.5% | no record | no record found in Official Gazette titles |
| Euphrates-TigrisH21 | 126% high | -27.5 cm | no data (DSİ table ends in 2024) | no data (no dam in this basin on the EPİAŞ list) | no record | no record found in Official Gazette titles |
| Eastern Black SeaH22 | 111% usual | -3.9 cm | no data (DSİ table ends in 2024) | last 35.4% · mean 55.6% | no record | no record found in Official Gazette titles |
| ÇoruhH23 | 104% usual | -11.5 cm | no data (DSİ table ends in 2024) | no data (no dam in this basin on the EPİAŞ list) | no record | no record found in Official Gazette titles |
| ArasH24 | 115% usual | -17.3 cm | no data (DSİ table ends in 2024) | no data (no dam in this basin on the EPİAŞ list) | no record | no record found in Official Gazette titles |
| Lake VanH25 | 110% usual | -24.2 cm | no data (DSİ table ends in 2024) | last 52.3% · mean 62.1% | no record | no record found in Official Gazette titles |
The licensed-well column is "no open source" in every basin, so it is left out of this summary table; it appears as a row on each basin page. The dam column is filled only for the 17 basins with a dam on the EPİAŞ list. Basin pages (/karne/…/) are in Turkish.
Sources and methodsource, date and limit of each column
- Rain
- CHIRPS v3.0 (UCSB Climate Hazards Center, CC BY 4.0) · 5 November 2026
Normal 1991–2020 computed by the site; band rule as above. - Satellite water storage
- NASA GSFC GRACE/GRACE-FO mascon RL06 v2.0 · 16 July 2026
Total water storage anomaly (cm, relative to the 2004–2009 mean); mascon resolution about 300 km, so the basin mean is approximate; it is a change value, not an absolute quantity. - Groundwater potential
- DSİ Resmî Su Kaynakları İstatistikleri, Tablo 1.3 (Havzalara Göre Yıllık Yeraltısuyu Potansiyeli, 2013-2024) · 20 July 2026
Calendar-year table; the calendar year closest to the water year is shown with a label. - Dam level
- EPİAŞ Şeffaflık Platformu (seffaflik.epias.com.tr) · 6 November 2026
Daily active fill (%), simple mean of the basin's dams; the archive began on 16 July 2026, earlier water years have no archive (EPİAŞ does not publish past values). - Official Gazette fields / closures
- T.C. Resmî Gazete — ilan sayfaları (ilanlar/eskiilanlar) ve arşiv PDF (arsiv/*.pdf); metin kaynaktan yeniden ayrıştırıldı · 10 October 2026
Counted through the basin's provinces (province → basin mapping), not by overlaying basin boundaries. - Drought records
- Resmî Gazete arama ucu (başlık araması) · 6 November 2026
Records whose title contains a drought keyword; linked to a basin when a province or basin name appears in the title; nationwide records are counted separately. - Licensed wells
- açık kaynak yok
DSİ does not publish licensed-well counts by basin; an information request is with the site owner.
Water year: 1 October–30 September. This page gives no score, no ranking and no forecast; the site's composite water-risk figure is not included in this table. Data: /veri/karne.json (CC BY 4.0; source licences apply separately).