In reading the attached papers, you will notice that the term hyperconcentrated flow is assigned to flows that are intermediate between clear-water floods and debris flows. It is generally thought that traditional hydraulic computational methods can be applied to hyperconcentrated flows. Following is a synopsis of the two attachments. A glossary of terms is printed at the end of this memorandum to assist readers who are unfamiliar with terminology used in these descriptions. 5 in Attachment 1 and fig.
Particles can be of a wide range of sizes.
Weak imbrication is sometimes present. Grains are typically angular but can include some rounded clasts picked up from the channel bottom. There are seldom voids between gravel clasts in the deposits. Vegetation in the channel can sustain great damage. This is the opposite of water floods where sediment tends to be deposited on the inside of meander bends.