Abstract
Zero‐order basins are unchanneled topographic depressions that concentrate surface and subsurface flow and often fail, forming debris flows or other mass movement events. The term “zero‐order basins” is awkward, and many hydrologists find themselves using other terms (such as swales, hollows, subhollows, coves, bowls, amphitheaters, etc.) to describe these features. Whichever name you prefer, W. Megahan and R. Ziemer of the U.S. Department of Agriculture (USDA) Forest Service (Megahan at Boise, Idaho, and Ziemer at Arcata, Calif.) organized an excellent session for the AGU Erosion and Sedimentation Committee. Current interest in this topic was made evident by the number of people attending the session, which was held on December 11, 1985, in San Francisco, Calif., as part of the AGU Fall Meeting. The session began with a number of talks about the hydrologic characteristics of specific sites.
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