HMDA began supplying treated water through Green Tankers for gardening and landscaping at the Telangana Secretariat, replacing about 1.5 lakh litres of freshwater daily. A similar initiative at Greenlands Guest House is saving another 30,000 litres daily. Hyderabad: Hyderabad Metropolitan Development Authority (HMDA) on Sunday began supplying treated water through its ‘Green Tankers’ for gardening and landscaping at Telangana Secretariat, replacing about 1.5 lakh litres of freshwater daily.