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j[L. V ~~~^^~~\I./u4J I..LL\V 111LL1.111\V .p1.14VUV O t\~v ~uu ~. u.Y <br />TABLE 4.7c Maximum Permissible Velocities for <br /> Rock Lined Channels and Riprap <br /> Graded Rock Size In. Permissible <br />NSA No. I Max. D50 Min. I velocity fpa* <br />~ :.-1 ~ 1.5 ~ .75 ' NO. 8 ' 2.5 <br />R-2 ~ 3 ~ 1.50 ~ 1 ~ 4.5 ~ <br />A-3 ~ 6 ~ 3 ~ 2 ~ 6.5 <br />R-4 ~ 12 ~ 6 ~ 3 ~ 9.0 <br />R-5 ~ 18 ~ 9 ~ 5 ~ 11.5 <br />R-6 ~ 24 ~ 12 ~ 7 ~ 13.0 <br />R-7 ~ 30 ~ 15 ~ 12 ~ 14.5 <br />~, <br />J <br /> <br />* Permissible velocities based on rock at 165 lbs. per cubic <br />foot. Adjust velocities for other rock weights used. See <br />Figure 4.6 <br />TABLE 4.7d Maxim~+m Permissible Velocities for + <br /> Reno Mattress and Gabions <br /> Thickness Rock fill Permissible* <br />Type n ( <br />I <br />inches I <br />Gradation-in. Velocity-fps <br />~ .025 ~ 6 ~ 3 - 6 ~ 13.5 ~ <br />Reno <br />Mattress ~ .025 ~ 9 ~ 3 - 6 ~ 16.0 <br /> .025 ~ 12 ~ 4 - 6 ~ 18.0 <br />Gabion ~ .027- ~ 18 + ~ 5 _ g ~ 22.0 <br />* Permissible velocities may be increased by the introduction of <br />sand mastic grout. Refer to manufacturers <br />recommendations/specifications for permissible velocities. <br />240 <br />