Drought
7 events, 1818 to 2019; 1 marked as turning points.
1818
Ellis orders new wells during the Madras water shortage
During a severe drinking water shortage in Madras, Collector Francis Whyte Ellis had 27 wells dug, one bearing a Tamil inscription honouring Thiruvalluvar.
1832
Guntur famine strikes the Madras Presidency
Crop failures led to a famine that took roughly 150,000 lives in Guntur district and spread as far south as Madras.
1876
Brought on by drought, a severe famine hit the Madras Presidency and other regions of India, killing millions.

1896
Famine of 1896-1897 reaches the Madras Presidency
A famine that began in Bundelkhand in 1896 spread across India, including parts of the Madras Presidency, where grain exports continued.

2003
Rainwater harvesting made mandatory for all buildings
After severe drought, a 2003 ordinance required every building in Tamil Nadu to install rainwater harvesting structures by 31 August.

2004
New Veeranam water supply project completed
A project to pipe water from Veeranam Lake to Chennai, first conceived in 1967, was completed during a severe water shortage.

2019
After a failed monsoon, Chennai's main reservoirs dried up, forcing heavy reliance on tankers and water brought by train from Jolarpet.