Groundwater Assessment
DRASTIC vulnerability index calculation, BIS 10500 water quality screening, and safe yield estimation. Supporting CGWA NOC applications and environmental impact assessments for Indian industrial and infrastructure projects.
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Groundwater Assessment in India: CGWB Framework
India extracts more groundwater than any country — 249 billion m³ annually, accounting for 63% of irrigation and 85% of drinking water. CGWB classifies 6,965 groundwater units as safe, semi-critical, critical, or over-exploited. 1,186 units are over-exploited (2022 assessment).
Assessment Methodology
The tool follows CGWB GEC-2015 norms for recharge estimation, BIS IS 15792 for artificial recharge feasibility, and IS 10500:2012 for water quality. It evaluates aquifer transmissivity, storativity, specific yield, and safe yield calculations.
Regulatory Requirements
Groundwater extraction exceeding 100 m³/day requires CGWB NOC. NGT orders mandate rainwater harvesting for institutions and industries. BRSR Principle 6 requires disclosure of groundwater withdrawal volumes and dependency.