Slopes range from 0 to 5 percent. The soils formed in alluvium that mostly eroded from soils formed in loess in the uplands. Mean annual temperature is 53 to 59 degrees F, and mean annual precipitation is 32 to 40 inches. These include the coarser textured Landes and Norborne soils and the finer textured more poorly drained Bremer soils. Landes and Norborne soils are on similar positions and Bremer soils are on lower positions.
Permeability is moderate.
Runoff is slow. Cotter soils are used for agricultural crops. Major crops grown include alfalfa, corn, soybeans, and wheat. Native vegetation is tall grasses mixed with cottonwood and willow trees. The series is of moderate extent.