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#630 YPM 6-1 view from newly graded slope following <br /> Slope and channel grading(8/12/09) <br /> #637 YPM 6-1 riprap section downstream view(8/12/09) <br /> Compare to#527 <br /> #638 YPM 6-1 riprap section upstream view(8/12/09) <br /> Compare to#528 <br />