Subsidence of peat lands of the Sacramento-San Joaquin Delta, California

Abstract

Subsidence which has totalled 5.5-7.3 ft. in 26 years, is progressing at an annual rate of 3 in. It is primarily due to an increased rate of oxidation, the practice of burning and to wind erosion, and not, as originally believed. to compaction by cultivation. Pressure on levees is increasing, drainage conditions are deteriorating due to lowered levels, and alkali salts are tending to accumulate. The soils from which the peat has gone have a considerable organic content and remain very fertile.