Land subsidence in drained histosols and highly organic mineral soils of California

A study determined the historical subsidence trends in the Sacramento-San Joaquin Delta and their environmental controls. In the western Delta, the average subsidence rates are computed as 2.3 cm per year from 1910 to 1988 and 1.5 cm per year from 1952 to 1988. This indicates that the subsidence decreased with time. The study also found that the subsidence rates are independent of the crops grown but correlate with soil organic content.