This chapter focuses on the general physical and morphometric changes associated with the 1993 flood, including soil erosion, channel scours, bank erosion, and the movement and deposition of eroded sediments and chemicals. As part of this physical assessment of the hydraulic and hydrologic impacts in the Upper Mississippi basin, the changes produced in the river courses, fioodplains and levees, and ground water are documented. Effects on river water quality extending down the lower reaches of the Mississippi River and into the Gulf of Mexico are also documented.