The board is currently supplying 560–570 MGD to the city: Reports. HYDERABAD: The city could face a drinking water deficit of up to 50 million gallons a day (MGD) between January and August next year, with falling storage in the Singur and Manjeera reservoirs and declining groundwater levels posing challenges to supply, Hyderabad Metropolitan Water Supply and Sewerage Board (HMWSSB) managing director K.