The effect of antecedent soil moisture is especially important in the region known as the Northwest Wheat and Range Region (NWRR).
	The effect is related to previous crops removing water from the soil resulting in higher infiltration rates and less runoff in subsequent periods.
	Effect is important else but not explicitly represented.
	NWRR is unique with its high erosion rates in the winter, partly caused by freezing and thawing and light rain on thawing soil, and reduced infiltration rates.
	Soil is highly erodible in the NWRR during the winter.