India should establish a national Strategic Drinking-Water Reserve Standard requiring every state to demonstrate sufficient dependable water reserves to provide 150 liters per person per day for three years.
The requirement is straightforward:
1 million people: 0.055 BCM per year → 0.164 BCM for three years
10 million people: 0.548 BCM per year → 1.64 BCM for three years
100 million people: 5.48 BCM per year → 16.43 BCM for three years
Therefore:
Required Strategic Reserve = Population × 150 litres × 365 days × 3 years
Each state should conduct a verified water-security assessment determining how much water from its existing reservoirs and other dependable sources would actually remain available for household consumption during a severe multi-year drought.
That amount should then be deducted from its three-year requirement.
Three-Year Requirement − Existing Dependable Drinking-Water Reserve = Drinking-Water Storage Deficit
States that already meet the standard would not need additional storage. States with a deficit should be required to close it.
Government should fund the infrastructure necessary to do so as a core public responsibility.
Depending on local geography and hydrology, this could include new regional reservoirs, expansion of existing reservoirs, off-stream storage that captures excess monsoon flows, restoration and expansion of lakes and tanks, managed aquifer recharge, or other appropriate large-scale storage systems.
The national government should establish the standard, measurement methodology, and independent verification framework. States should prepare regional water-security plans and build the infrastructure necessary to meet the standard.
The objective should not be to prescribe one type of dam or reservoir. It should be to guarantee the outcome:
Every state must be able to demonstrate three years of dependable household water reserves.
A national dashboard should publicly report Days of Drinking Water in Reserve for every state and major water-supply region. This would make water security measurable and allow investment to be directed first toward the areas with the greatest deficits.
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