Sediment Transport of Streams Tributary to San Francisco, San Pablo, and Suisun Bays, California, 1909-66

摘要

A review of historical sedimentation data is presented, results of sediment-data collection for water years 1957-59 are summarized, and long-term sediment-discharge estimates from a preliminary report are updated. Comparison of results based on 3 years of data to those for the 10 water years, 1957-66, provides an indication of the adequacy of the data obtained during the short period to define the long-term relation between sediment transport and streamflow. During 1909-66, sediment was transported to the entire San Francisco Bay system at an average rate of 8.6 million cubic yards per year. The Sacramento and San Joaquin River basins provided about 83 percent of the sediment inflow to the system annually during 1957-66 and 86 percent during 1909-66. About 98 percent of this inflow was measured or estimated at sediment measuring sites. Measured sediment inflow directly to the bays comprised only about 40 percent of the total discharged by basins directly tributary to the bays.