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The size, shape, and grading 'of rock materials used for riprap are important. <br />~;~„1. Sharp, angular rock such as blasted quarry rock are preferred over <br />smooth, round river cobbles or boulders which are more readily detached <br />by swift currents. <br />2. The gravel blanket should be evenly distributed over the slope area <br />prior to placing of riprap unless otherwise directed by a technician. <br />Streambed sand and gravel can usually be used for the blanket filter. <br />3. The largest rock should be placed <br />Consult a technician for recommen <br />forces for your location. <br />!i. All rock should be graded in such <br />and spalls fill the voids between <br />Installation of rock riprap should be <br />ications prepared for your project. <br />first in the toe of the revetment. <br />ied sizes of rock to withstand stream <br />a manner that smaller rock, fragments, <br />the large stone, <br />in accordance with plans and specif- <br />1. Preparation of the site should conform to plan or as staked in the field. <br />..,.,., <br />\,;1s~ <br />~: <br />2. Placing of the gravel blanket and rock as shown above is important and <br />should be supervised by a qualified person. <br />188 <br />