Geomorphic Effects of Dams on Rivers

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Geomorphic Effects of Dams on Rivers

• Gordon Grant

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Hydrologic Regime

• The hydrologic regime
• Geology
• Climate
• Topography
• Changes in flow (Q) due to manipulation
• Direct dams, diversions
• Indirect climate shift, forest practices
• Flows are influenced in magnitude, duration,
  frequency and time
• There are consequences for manipulation

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Hydrograph McKenzie River, OR
Flood control dams
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Summary

• Dams alter
• Sediment regime
• Hydrologic regime
• River morphology