Levees

Levees

1. Sediment

   • banks
     • deposition
       • lower stage
         • loses energy
           • slows down when it floods
             • becomes shallower
               • deposition will occur on riverbed
                 • overflows on to floodplain
                   • River overflows
                     • loses energy
                       • deposits
                         • heaviest stones close to banks
                           • sediment builds on banks
                             • natural defence
                               • rises higher to escape levees
                                 • levees preventing overflow
                           • humans interfere with natural processes
                             • triggering extreme floods
                               • examples
                                 • DON'T FORGET DIAGRAM