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<br />V. <br />ADVANTAGES, <br /> <br />CONSTRUCTION MEASURES- <br />DI SADVANTAGES, COSTS <br /> <br />ROCK RIPRAP PROTECTION - FULL BANK <br /> <br />~1~ j.2. (J ) FULL flANKLlNE RII'RAP rf <br />q. ~ ?F N'I_~ .~ L_/ <br />~1Ir'r-'1(J ~/=~[ <br /> <br />I <br />." IIII,,,'''''>!' ),"",..,~:"," <br />."""",,'" ",,,"'" <br /> <br /> <br />.~>i- <br /> <br />TYPICAL SECTION <br /> <br /> <br />Rock rlprap placed on eroding banks Is an effective measure to control erosion. <br />Generally, a 12- to 18-lnch thick blanket of stone weighing from 20 to 150 pounds Is an <br />acceptable specification. Stone rubble and broken concrete have been successfully used. <br />Pr lor to placement. the bank Is usua I I Y graded, I f the s lope I s I rregu I ar, and a bed of <br />gravel or porous filter material Is laid to allow seepage but which wi II prevent erosion <br />of the bank material. Varying the rock and rubble size from small to large produces a <br />compact blanket. <br /> <br />ADVANTAGES, <br /> <br />I) <br /> <br />Local damage or loss Is &as I ly repaired by placement of more rock. <br /> <br />2) Construction is not complicated and only standard construction and <br />practices are necessary. <br /> <br />3) Appearance Is natural, hence acceptable In recreational areas. <br /> <br />4) If rlprap Is exposed to fresh water, vegetation will often grow <br />through the rock adding sTrucTural value to the bank material and <br />restoring natural roughness. <br /> <br />5) Riprap Is recoverable and may be stockpiled for future use. <br /> <br />11 <br />