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<br />V. CONSTRUCTION <br />ADVANTAGES, <br /> <br />MEASURES - <br />DISADVANTAGES, COSTS <br /> <br />ROCK RIPRAP PROTECTION - FULL BANK <br /> <br />. .. j -i . ~ 2 / ,FULL <br />-_"- c ''0 'J ) <br />~~~'1K~--(,vett'rI9-- <br />c0ilf/0' 0vC~ <br />, ,I <br />II ",,"""'" <br />..".,L,'.\,IIlo"., <br /> <br /> <br />!lilA/KLINE RIPRAP .J' <br />. ...9 ' <-_/.. <br />.-- "\.. ~J <br />- ~ <br />,....:jr <br /> <br />.,,:/". <br /> <br /> <br />f.~ <br /> <br /> <br />Normal <br />Water SurTt.1cc <br /> <br />TYPICAL SECTION <br /> <br />Rock riprap placed on eroding banks Is an effective measure to control erosion. <br />Generally, a 12- to l8-inch thick blanket of stone weighing from 20 to 150 pounds fs an <br />acceptable specification. Stone rubble and broken concrete have been successfully used. <br />Prior to placement, the bank Is usually graded, If the slope is Irregular, and a bed of <br />gravel or porous filter material is laid to allC'lfi seepage but which will 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 />1) <br /> <br />Local damage or loss Is easfly repaired by placement of more rock. <br /> <br />2) Construction is not coop I Icated 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 fs exposed to fresh water, vegetation wll r often grow <br />through the rock adding structural value to the bank materIal and <br />restoring natural roughness. <br /> <br />5) Rlprap Is recoverable and may be stockpiled for future use. <br /> <br />11 <br />