For Deposition, this are the factors that will lead to increase in deposition:
1. Low rainfall.
2. lower gradient (lower course of the river, less gravity pull)
3. increase in load (more rocks, more energy used up)
4. Increase in friction (such as rocks and plants in the way)
Follow this 4 points to help you understand the summary matrix in your textbook on page 117.
Check this animation for a better clarification:
http://www.classzone.com/books/earth_science/terc/content/visualizations/es0604/es0604page01.cfm?chapter_no=visualization
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