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<br />For channels squiring riprap, the Pader method is used to estimate the required D50 size. <br />However, based on SCC experience, the Pader method seems to underestimate the required rock <br />size, so SCC adds 3 inches to the rock size required for design purposes. For further protection of <br />the channel bed, a layer of geotextile fabric is installed prior to placement of the riprap. <br /> <br />• <br />PR-02 Oa Revised 03/05 <br />