Data from the Jal Dharohar Water bodies census conducted by the Department of Water Resources, River Development and Ganga Rejuvenation.
The census was conducted in 2018-19 and the data released in 2023.
Data for Chennai district from the Household Consumption Expenditure Survey of 2022-23 by the Ministry of Statistics and Programme Implementation.
The data is for all 15 levels as published by the MoSPI
Tamil Nadu Combined Development and Building Rules of 2019 are rules and guidelines for construction of buildings - residential and commercial in Tamil Nadu including Chennai Corporation Limits.
The document is from February 2019