New York State has a diverse hydrological landscape with significant variations in flow conditions. Major surface flows include the Hudson River, Lake Ontario, and the Great Lakes. The state's reservoirs and dams, including the Ashokan Reservoir and the Niagara Falls hydroelectric plant, play an important role in water management. The state's climate characteristics, with humid summers and cold winters, can have significant impacts on hydrological patterns. Major rivers and tributaries include the Mohawk River, the Genesee River, and the Delaware River. Snowpack and watershed data are also important factors in understanding New York's hydrology, with snowmelt contributing to springtime runoff and potentially affecting water availability during the summer months.