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Homework answers / question archive / 1) Describe the concept of a runoff?  Define the concept of drainage basin and describe one of the major watersheds in North America

1) Describe the concept of a runoff?  Define the concept of drainage basin and describe one of the major watersheds in North America

Earth Science

1) Describe the concept of a runoff? 

  1. Define the concept of drainage basin and describe one of the major watersheds in North America. What are the major tributaries? boundaries of this drainage basin, and what are some of the major tribunes?  
  2. Imagine that two drainage basins are found in a humid environment. One of the watersheds has high drainage density, whereas the other one does not. Assuming that each drainage basin lies within a region of similar relief, what environmental variable most likely accounts for the difference in drainage density? Why? 
  3. What is the minimum number of tributaries that a fourth-order stream has? How many stream confluences are there in this watershed? 
  4. Name four primary hydraulic variables. Provide an example of how one variable influence another.
  5. Compare and contrast the concept of base flow and base level. 
  6. Which landscape is more likely to contain graded streams: one that has recently been uplifted or one that has been stable for a long period of time with a consistent climate? Why?  
  7. Name and describe three landforms associated with a stream that is striving to reach a graded condition. 
  8. Name and describe three landforms associated with a graded stream. 
  9. How can deposition and erosion both occur along a stream meander? 
  10. Imagine that you encountered a stream with well-developed meanders that are deeply entrenched. Describe two reasons why this landscape would evolve. 
  11. Why is a terrace an abandoned floodplain? Describe the two ways that terraces form. 
  12. Describe the formation of river deltas.
  13. Why is peak discharge greater in streams contained within urban areas than those in the surrounding countryside? 
  14. Describe how a dam provides flood control for a city that lies downstream of the structure. 

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