strath terrace C) 7 78 What is ?? 79. What is?? D what is ?? , 9 81. The highest

Question

strath terrace C) 7 78 What is ?? 79. What is?? D what is ?? , 9 81. The highest and driest area in the bottom of a mean- dering stream's valley-where you would build your house or barn, given the choice-would be on a/the: A) point bar B) yazoo stream C) oxbownatural levee E) backswamp 2 82. When does most of the erosion and channel forming work in streams usually occur? during floods B) when the water table drops C) when a stream flows into a slower-moving stream D) when the velocity decreases E) when stream turbulence decreases the velocity decreases E) when stream turbulence decreases 83. Topset, foreset and bottomset beds and crows-feet are components of: A) terraces B) channels C) debris flows D) bedrock channelsdeltas braided 84. On undisturbed hillslopes in the humid climate and lush vegetation of western Oregon, most of the precipitation during a short rainstorm goes into: A) Horton overland flow B) precipitation-excess flow subsurface stormflow D) return flow E) deep groundwater 85) A watershed with a high drainage density probably has a large proportion of: A) deep loamy soils and thick vegetation B) wind-blown sands relatively impermeabl caves E) ground covered with young volcanic cinders and blocks 8 etation B) wind-blown sands d relatively impermeable soils D) porous limestone and 86) For any particular river, the phrase "100-year flood" means: A) a high flow that should never be equaled B) the flow having a 1% chance of being exceeded in any year C) if it happened last year, it can't happen again for about a century D) a property of the stream that won't change E) the area of maximum inundation according to the oldest resident

Explanation / Answer

86. B

A term used to define an extreme flow rate that has a one percent chance of being exceeded in any given year. The 100-year flood is a flood that is equaled or exceeded once every 100 years on average. The term should not be taken literally as there is no guarantee that the 100-year flood will occur within a 100-year period or that it will not recur several times.

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