Why it is in the news
Water in the backwaters of the Priyadarshini Jurala reservoir turned dark green with a foul smell, killing fish and prompting officials to stop drinking-water supply and test samples, as reported on 7 October 2026.
The exam angle
Syllabus: Group 1 Prelims: 6. World Geography, Indian Geography and Geography of Telangana state; 4. Environmental Issues; 11. Society, Culture, Heritage, Arts and Literature of Telangana. Groups 2–4: rivers, drinking-water schemes and heritage of Telangana.