Assertion: delta's sediment | /r/HasProperty | deposited by annual river floods
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Source sentences:
text: The height of these natural levees, formed from overbank deposits of sediments deposited by annual river floods, ranged from one foot (0.30 m) above mean high tide at Sherman Island on the Sacramento River, to seven to eight feet (2.1 to 2.4 m) at Andrus, Staten and Tyler Islands, located further east near the Mokelumne River.