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D50 = 12(118 Q $z.~~ (R/P))o.e <br />Where D5o = Riprap mean particle size <br />Q =Flow rate (cfs) <br />S = Channel bottom slope (ft/ft) <br />R =Hydraulic radius <br />P =Wetted perimeter <br />The diameter of the largest stone size should be 1.5 times the D50 size. <br />The minimum thickness of the riprap layer will be 1.25 times the median <br />stone size, but not less than six (6) inches. <br />A rock filter blanket will be placed below the riprap. The filter blanket <br />will consist of uniformly graded durable rock material with a thickness of <br />six to nine inches. For further information on channel protection refer <br />to Appendix D, Guidance for Erosion Protection. <br />n <br />a:; <br />• <br />C \WORR\PRI\EbP&QfR I].REV <br />~„15~,~ lOR Revised - April 1993 <br />