Expert Says Indians Will Soon Be Water Refugees Heading for Water-Rich Europe
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Some of the causes are deforestation of hill slopes, large, ill-planned dams which are silting over, lack of water micro-management, storm-water drains instead of recharge wells, lack of rainwater harvesting, excessive consumption, encroachment of nearly every water-body, pollution of most of the remaining lakes and rivers etc. etc. It goes on and on. The point is India does get enough rainwater despite very hot summers, but human management sucks abysmally.
I presume you're in Tamil Nadu because TN's rainy season is mostly due to the NE monsoon which hasn't started yet. Rainfall in the North-Western regions like Punjab really has been insufficient in past years. In many regions in Punjab it simply doesn't rain in the 'rainy season' anymore. Even in Tamil Nadu, didn't Chennai experience more than a 50% deficit in 2018?[1] When I visited Pondicherry a few years ago, everyone I spoke to said it now rains very little compared to the usual. This year's SW monsoon has seen heavy rains but it seems to be an outlier compared to the past few years.
You are correct that there is gross water mismanagement and unplanned urbanisation. Ironically, Chennai's National Institute of Ocean Technology -- one of whose jobs is to prepare impact assessment reports on 'the implications of constructing on waterbodies'[2] -- is itself constructed on a paved-over former catchment area (and gets flooded as a result).[3]
[1] https://weather.com/en-IN/india/monsoon/news/2018-12-23-hist...
[2] https://qz.com/india/563396/chennai-floods-are-not-a-natural...
[3] https://www.downtoearth.org.in/news/natural-disasters/why-ch...
Causes of Syrian war are a bit more complicated than what you say. Marches don't necessarily lead to war.
Since the originally-British water system was not maintained, it now leaks. So, unlike a pressurized water system--where leaks cause water to LEAVE the system, a non-pressurized system--as Indians now have--combined with the aforementioned pumps, makes it so leaky pipes cause outside filth to ENTER the system. Combine that with the practice of co-locating sewer lines in the same trenches as water lines, means that when the water comes on and individual pumps kick in, causes sewage water to enter the water system and be pulled into people's cisterns. That's why any Indian household like this must use reverse osmosis to make their water potable.
All because the pressurized water system was allowed to go derelict.