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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. "Tule" (bulrush over thousands of years, Water table <br /> and reed species) <br /> Main channel Channel <br /> PREDEVELOPNIENT <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 /> greatest thickness and subsi- <br /> dence of peat soils near the <br /> POSTDEVELOPMENT center of islands. <br /> � �r2•fti •r1•iti ._ •r2�v �rA�ti r1•iti ,s <br /> lF.lt- <br /> rJej1, f5 'J�J} <br /> T-?!r f-�i-�'— f-lF-'�� f-1►' y�� f-}i� T� i-li-�`� T-fry � .f f. 9. <br /> Not to scale <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 n Figure <br /> consultants 10 <br /> WR2501B June 2022 <br />