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165 <br />RIPRAP SPECIFICATIONS <br />Size: <br />~~ <br />K100 - 2 Km <br />K50 - Km <br />K15 - 1/3 Km <br />Kx is the sieve diameter for which x percent (by weight) <br />of the riprap material is finer, i.e. 100 percent passes <br />a diameter of 2 K K is the median or effective stone size. <br />m m <br />Shape: blocky, cubical shape with sharp edges <br />not more than 25 percent of the stones reasonably <br />distributed throughout the gradation shall <br />have length more than 2.5 times breadth <br />no stone shall have length exceeding three <br />times its breadth or thickness <br />I • Blanket Thickness: <br />thickness - 1.5 Km; 12 inches minimum <br />increase thickness by 50 percent if placed <br />under water <br />increase thickness by 6 to 12 inches (with <br />stone size increase of 4 to 8 inches) when <br />subject to attack by waves or floating debris <br />General: <br />Riprap must be sound, durable and not subject <br />to disintegration due to repeated wetting <br />and drying or freezing and thacaing. <br />3 - 6 inches of concrete sand must be provided <br />• as a filter material beloca Che riprap <br />Leonard Rice Consulting Water Engmeers.lnc <br />