Environmental Engineering Reference
In-Depth Information
construction of dams, construction of levies, and alterations of flow
from water use.
6. Rivers transport dissolved materials driving global biogeochemical
cycles. The average concentrations of sulfur, nitrogen, and phosphorus
have increased 30-50% because of human activities.
7. Erosion and transport of silt and larger materials on river bottoms are
influenced by discharge and particle size.
QUESTIONS FOR THOUGHT
1. Why might some regions in deserts serve as runoff sinks (i.e., have
more water flowing in than out)?
2. How can levees act as dams to upstream areas during floods?
3. Why does channelization increase the movement of bed load during
floods?
4. How may the amount of suspended materials in streams alter the
rates of photosynthesis of organisms attached to the stream bottom?
5. How might vegetative characteristics in a watershed relate to stream
flow in terms of total amount and in terms of how many floods occur
per year?
6. How does frequency and predictability of flooding relate to the
possibility that stream organisms are adapted to flooding?
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