Watersheds

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Unit 6

• Watersheds

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Watersheds

• The land that supplies water to a river system is
  called a watershed.

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River Systems

• Tributaries are the smaller streams and rivers
  that feed into a main river.
• A river and all its tributaries together make up
  a river system.

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Divides

• One watershed is separated from another watershed
  by a ridge of land called a divide.

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watershed
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Water Monitoring

• Water quality monitoring is the collection of
  water samples.
• Simple tests are done such as pH, temperature,
  salinity, and the presence of macroinvertebrate
• organisms.

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Biotic Factors

• The organisms that make up the living part of an
  ecosystem are called biotic factors.

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Abiotic Factors

• The nonliving things found in an ecosystem are
  called abiotic factors.

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Point Sources

• Major sources of water pollution human wastes,
  industrial wastes, agricultural chemicals and
  runoff from roads.
• Point source a specific source of pollution
  that can be identified, such as a
• pipe gushing dirty water into a river.

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Nonpoint Sources

• Nonpoint source - a widely spread source of
  pollution that cannot be tied to a specific
  point, such as pesticides and fertilizers.