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<br />3, Abutment Shape <br /> <br />There are two general shapes for abutments; i.e., vertical-wall <br />abutments with wing walls and spill-through abutments, Figure <br />4.3. Depth of scour is about double for vertical-wall abutments <br />as compared with spill-through abutments. <br /> <br />~~' <br />, I'"' <br /> <br />Elevation <br /> <br />\ <br />! <br />! <br />I <br />Plan <br /> <br />~~'''T~ <br /> <br /> <br />r-A <br />r.:. <br />I <br />l- <br />I- <br />>-- <br />". <br />L-t: <br /> <br /> <br />Section A-A' <br /> <br />(A) SPILL THRCUGH <br /> <br />~ <br />" , ""' - ~ ,,'!, ,.,.,," ' <br /> <br />.,,/ <br />Elevation <br /> <br /> <br />I <br />I <br />I <br />I <br />Plan <br /> <br /> <br />".""u <br /> <br />, ,. I . '.. r- <br /> <br />Section A-A' <br /> <br />(B) VERTICAL WALL <br /> <br />Figure 4,3 Abutment Shape <br /> <br />46 <br />