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For channels lined with rock riprap, the PARER Method is sued to estimate the required rock size. <br />However, based on SCC experience, the PADER Method seems to underestimate the required rock size, so SCC <br />adds 3 inches to the rock D50 size specified by PARER for design purposes. For further protection of the <br />channel bed, a layer of geotextile fabric is installed prio to placement of the riprap. <br />TR -37 8a Revised 02/08 <br />