1. Geomorphic Effects of Dams on Rivers Gordon Grant

2. Hydrologic Regime  The hydrologic “regime” Geology Geology Climate Climate Topography Topography  Changes in flow (Q) due to manipulation Direct = dams, diversions Direct = dams, diversions Indirect = climate shift, forest practices Indirect = climate shift, forest practices  Flows are influenced in magnitude, duration, frequency and time There are consequences for manipulation There are consequences for manipulation

3. Hydrograph – McKenzie River, OR Flood control dams

4. Summary  Dams alter… Sediment regime Sediment regime Hydrologic regime Hydrologic regime River morphology River morphology