Quality controlled, reliable groundwater level data with corresponding specific yield over India

This repository includes the raw groundwater level dataset obtained from Central Ground Water Board (CGWB), comprising measurements from 32,299 wells across India (1_India_GWLs_2000_2024_wells_within_India.csv). After applying a series of quality control and preprocessing steps including removal of missing/negative values, outlier filtering using the three-sigma method, and consistency checks (e.g., minimum two readings per year and avoidance of repeated values), a refined subset of 2,759 reliable wells was identified for the period 2000-2022 for robust long-term spatiotemporal analysis.In addition, the dataset includes specific yield estimates for each reliable well, derived using a Vectorization-based method and a hydrogeological map of India. The provided scripts enable users to reproduce the data processing steps and perform further analysis, including comparison with satellite-based (e.g., GRACE) or model-based groundwater storage estimates.