There is a typical and clear association between passive margins, wide coastal plains, and large drainage basins. This produces large rivers and yields large sediment supply. Examples of important deltas around the world. This delta is the classic example of a delta which was scientifically studied by the ancient Greeks. Deltas are natural sites of agricultural development.
Floods deposit new sediment each year.
Delta is near base level and has shallow water table. Deltas represent the surface of thick sediment bodies which have been built up over millions of years. As new sediment is added, the entire sediment pile subsides to compensate. B. Processes of Delta Formation 1. As a river enters an ocean or lake, the jet of sediment-laden water diffuses and slows.