"Freshwater runoff" refers to the water that flows from land, such as rainwater or melting snow, into rivers, lakes, or other sources of fresh water. Full definition
The life of the inner - shelf lagoon becomes considerably more restricted near the mainland where freshwater runoff is important. (ambergrisCaye.com)
Regional climate change models predict an increased freshwater runoff into the Baltic Sea. (sciencedaily.com)
In this case, the fact that the Greenland Ice Sheet is loosing mass and contributing to freshwater runoff into the North Atlantic decades ahead of schedule may be the reason that the Atlantic Meridional Overturning Circulation (AMOC) is weakening decades ahead of schedule as well. (mashable.com)