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The major components of the Delta Water Supply are illustrated in the components figure along with the components which use this supply. These figures contain average annual values for the recent period of 1980-1991. The average annual inflow to the Delta is 27,840 thousand acre-feet (TAF) for this period with the Sacramento and San Joaquin rivers contributing over 75 percent. Average annual Delta water use also totals 27,840 TAF with outflow to San Francisco Bay being the major component. When Delta outflow is compared to the average tidal flow at the Golden Gate or Chipps Island, its magnitude diminishes greatly. The outflow figure illustrates this point. It compares average Delta outflows for winter and summer with average tidal flows at the Golden Gate and Chipps Island.