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<br />, <br />.....~FAI.URE SURFACe- <br />... <br />.... . <br />,.. ." FUJVlAL EROSION <br />,./ OF LOWER BANK MATERIAL <br />, - <br />(a) NON COHESIVE <br /> <br /> <br /> <br />Fl.OW SlIDES <br /> <br />7 <br />"/ <br />/ /"FAIUJRE 6mFACE <br />/ <br />/ <br /> <br />TE/'lSION CRACK <br /> <br />SHAL!.OW ROTATIONAL SLP <br /> <br />I <br />/ I-DEEP ROTATIONAL SLP <br />/ , I <br />/ P I <br /> <br />/~x" ,,/ <br />- " <br />--- - - -_/ p~eSLP <br /> <br /> <br />( b ) COHESIVE <br /> <br />L~~~FAi1mE SURFACE <br />J"_~__c.Qti~.!YE <br />----- -------, <br />NON COHESIVE <br /> <br />L,k FAILURE SURFACE <br />... --- - --.....COHESIVE <br />NON COHESIVE <br /> <br />/ R"~FALURE SURFACE <br />{" ~EAK LAYER <br /> <br />( f':::'-FAU.URE SURFACE <br />. "WEAK LAYER <br /> <br />CANTl.EVER FAILURE PATTERNS <br /> <br />~ y; <br />COHESIVE /' . <br />_-=-_-:::, ~L..:.:- ~~:..::: <br />NON COHltSIVE <br /> <br />[jC- <br />----- <br /> <br />Ce) COMPOSITE <br /> <br />TYPICAL BANK FAILURE SURFACES: <br />(A) NONCOHESIVE, (B) COHESIVE, AND (C) COMPOSITE <br /> <br />2.8 <br />