A biodiversity map called ‘Theme 2012’ was released on the occasion. Depicting parks, habitation, roadways and GHMC boundaries of the city, the map prominently denotes the water tanks and water bodies in the city.
The APNGC, HMDA, Sukuki Exnora, SOUL and Blue Cross together put up the contents on the map. The map also lists the 168 recognised lakes in the city with their surface area, physiography, drainage pipelines and also a small environmental map, which is made using geographical information system.
A comparative study of the decrease in the surface area of the Hussain Sagar Lake in 1974 and now, which is from a 550 hectares to about 300 acres in the last 25 years, is also published behind the map, providing a clear idea of the encroachments around the lake. The lake is also a guide to the Ground Water Table depth in the city.