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Riprap <br />Ai <br />Water <br />BaCklili to Original <br />'-"~-~ - <br />for Scour <br />a <br />USUI, FAS 19ffi <br />b <br />Depends an Potential <br />Figure D-8 <br />Cross-Sections of Toe Protection Configurations: <br />a) Extension of the Riprap Below the Dry Bed and Backfilling, and <br />b) Placement of Extra Material Along the Bed to Launch Itself into Developing <br />Scour Holes <br />