Historical data is past information collected long back in time. Some time it may be relevant today when it happens to contrast development process in the society.
Historical data on natural resources is conspicuous by their absence due to very limited data collection platforms available in the past.
Water and Water quality is one such area and documentation of such historical data would be invaluable where it compares / conflicts with current data. Some information of groundwater quality data of Chennai will be shared here.
