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This animation shows how the total amount of water (snow, surface water, soil moisture, and groundwater) varies in space and time, with the passage of dry seasons and wet seasons as well as with flooding, drought, and transport due to water management. Blue colors represent wetter than average conditions (relative to 2004-2010), while red colors represent drier than average conditions. The yellow line in the graph on the left shows the evolution of the month-to-month variations for the area outlined in yellow on the map.

The Sacramento, San Joaquin, and Tulare basins are outlined in yellow, and rivers and tributaries are shown as blue lines. 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