GEOL
Assignment 10

Assignment 10 - Assignment 10 1 List the 4 key variables...

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Assignment 10 1. List the 4 key variables that describe how streams work. The four key variables are discharge, available sediment, gradient, and the sinuosity of the stream path. 2. A) Describe what happens to a stream if it has too much discharge. When a stream has too much discharge, there is an increase in erosion of the stream bottom and there can also be an increase in the sinuosity of the channel which creates meanders. B) What happens if a stream has too much sediment load? Too much load causes sediment disposition on the stream bottom which creates a braided stream. 3. A) What expected flood size does FEMA use to establish its regulatory requirements? FEMA uses 100-year floods to establish its regulatory requirements. B) In any given year , what is the probability that a 100 year flood will occur? The probability that a 100-year flood will occur in a year is 1%. 4. What are 6 ways that killer floods can occur? The 6 ways are a local thundercloud that can form a flash flood in a couple hours, abundant rainfall lasting for several days, storm surges of cyclones flood the coasts, the breakup of winter ice can block a water flow and then when the block fails an ice-jam flood can occur, hot weather that causes rapid snow melt, and short-lived natural dams that fail. 5. A) Are the canyons of Utah susceptible to flash floods? Why or why not? Yes, because the steep topography provides valleys to channel the floods when there is a thunderstorm that occurs.

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B) How deep does water have to be to possibly be fatal
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• Spring '09
• Berelson
• San Diego, River, San Diego River

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