The Mississippi AlluvialPlain (73) extends along the Mississippi River from the confluence of the Ohio and Mississippi rivers southward to the Gulf of Mexico; temperatures and annual average precipitation increase toward the south.
The Mississippi AlluvialPlain is in the northern part of the Mississippi Embayment, a geologic structural trough in which the underlying crust of the Earth forms a deep valley.
The natural regional flow of ground water in the Mississippi Embayment in the Tertiary aquifers is from the outcrop areas in the upper Gulf Coastal Plain, laterally along the aquifers toward the embayment axis, and then upward through overlying confining units and aquifers to the surface of the Mississippi AlluvialPlain (Grubb, 1986; Ackerman, 1989).
Flood plain is the term in physical geography for a plain formed of sediment dropped by a river.
Flood plains may be the result of planation, with aggradation, that is, they may be due to a graded river working in meanders from side to side, widening its valley by this process and covering the widened valley with sediment.
The flood plain during its formation is marked by meandering, or anastomosing streams, ox-bow lakes and bayous[?], marshes or stagnant pools, and is occasionally completely covered with water.
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