Small Reservoirs maximum water area extent polygones composing the Rainwater Harvesting System over the Telangana state, South-India. Maximum water area extent (occurence >0) is extracted form the Global Surface Water dataset at 30 meters resolution (doi:10.1038/nature20584) and currated from rivers, canal and dammed reservoirs related surface water areas. The last access to GSW maximum water extent to build this dataset was in November 2022.