While a nearly record-breaking rainy season has battered California’s dams and stretched the limits of local levees, the storms that began to hit Sacramento on Tuesday aren’t expected to put much additional strain on the state’s flood-control system. Spanning into next week, the storms are expected to drop as much as two inches of rain in Sacramento and two feet of snow in the higher elevations of the Sierra Nevada. But federal weather forecasters said Tuesday they aren’t too worried about widespread problems.