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In August 2018, Kerala received its heaviest monsoon rains in about a century. The worst landslides hit hill districts such as Idukki and Wayanad, where quarrying and slope clearing had been heavy, which makes the event a test case for separating natural rainfall from human-made vulnerability.
Extreme rain became catastrophic because hill slopes had been stripped of the forest cover and root systems that hold soil and slow runoff. Blasting and cutting from quarries loosened and destabilised the slopes further. The disaster was therefore not simply an act of nature; land-use decisions in the uplands set how much damage the same rainfall would do downstream.
The 2011 Western Ghats Ecology Expert Panel, led by Madhav Gadgil, mapped ecologically sensitive zones and recommended limits on quarrying, mining and construction there. Opposition from political parties, church groups and local economic interests led governments to set it aside for a diluted alternative that protected far less area. When scientific warnings threaten concentrated livelihoods and interests, they tend to be buried, and their costs return later as disasters spread across everyone.
Dams run mainly to maximise hydropower and storage keep reservoirs near full ahead of peak rainfall, so they have no buffer left to absorb extreme inflows. When a deluge arrives, operators must release water from many dams at once, and those releases add to river floods that are already rising. Infrastructure built partly to control water can then deepen a flood if its operating rules ignore worst-case rainfall.