Pre-monsoon (May) and post-monsoon (November) depth to ground water by station, with January and August, and a district summary (wells, median depth, wells risi

Pre-monsoon (May) and post-monsoon (November) depth to ground water by station, with January and August, and a district summary (wells, median depth, wells rising/falling over the monsoon), derived from CGWB readings on India-WRIS. Default start is 1980 (the earliest manual readings); each call covers up to `max_years` years (<= 10) and returns `next_start_year` to continue. Labelled derived: CGWB's own district pre/post-monsoon reports are listed by cgwb_publications.