Most of the Sacramento–San Joaquin Delta has been reclaimed for agricultural use, which has led to subsided land. View this segment to learn

• about the tidal freshwater marshes that used to exist in the Delta.
• how the construction of levees has altered the Delta.
• how reclamation of the marshes led to subsidence of the land.
• why subsided land makes levees prone to break.

Download the Viewing Guide for pre- and post-viewing discussion questions, activities, and additional resources to use with students.

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