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Sacramento-San Joaquin Delta <br /> Natural levees were formed by <br /> sediments deposited during spring Peat soils were formed <br /> floods and stabilized from decaying vegetation <br /> by vegetation. "rule" (bulrush over thousands of years. Water table <br /> and reed species) <br /> Main channel Channel <br /> PREDEVELOPMENT <br /> 747. <br /> :x:I? �✓v.S.�Gti�•.,.���.��� �.i( if���'-.t�i.-ice/?�.� _ <br /> Riparian vegetation was `Semicontinuous pumps Levees must be periodically <br /> cleared and levees were remove agricultural reinforced to support increasing <br /> built to create farmland. drainage to maintain a stresses from stream channels. <br /> low water table. Saucer-shaped profile reflects / <br /> i greatest thickness and subsi- l <br /> Bence of peat soils near the . <br /> POSTDEVELOPMENT /J center of islands. <br /> AIF <br /> . 'i J,�(IS,�ty�, ��-.{�•"ir .��. .�r�. 1�S:t17� l�:rt� .1Y•�'1'�,� <br /> .'�Jr/:i✓�ir{�7�1/' {fi}r� y5'I�•..�.�fA:•' i� �r �(�f�tr.1 i'f�� �\l(j!• <br /> Notes: USGS Sacramento-San Joaquin Delta Islands <br /> Taken from S.E Ingebritsen,US Geological Survey Menlo Park,California,and Marti E.Ikehara,National Geodetic Survey Sacramento,California. Conceptual Site Model <br /> 2000 Delta Subsidence in California,The sinking heart of the state,USGS Fact Sheet FS-005-00,April <br /> Rough and Ready Island,Port of Stockton <br /> Stockton,California <br /> Geosyntec° Figure <br /> consultants 5 <br /> SAC233 February 2018 <br />