Hillslopes identified as main source of sediment in Arizona watershed.
A study looked at how sediment moves in a small dry area in Arizona. They collected data for over 40 years and found that most of the sediment comes from hills, not rivers. Rainfall in the summer affects how much sediment moves around. Dams can change where sediment goes, but they might not show the whole picture. Knowing where sediment comes from helps us take care of the land better.