Hydrology is the study of the movement, distribution, and quality of water on Earth, including the hydrologic cycle, water resources and environmental watershed sustainability.
Roughly 75 percent of California’s drinking water originates in forested watersheds. When forests are properly taken care of and fires aren’t severe, forests act like natural filters, helping soils absorb nitrates, phosphorus and other nutrients. Tree canopies also deflect rain, preventing erosion and allowing soils to soak up water.
See below for current river flow rates, reservoir levels, and snowpack data.