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b. A rolling grade dip incorporates a knick at the end of a long gradual dirt ramp. The <br /> knick-like depression shall be longer than a bike whereas the ramp shall be 10 to 20 <br /> feet. The excavated soil shall be used to construct the ramp. Rolling grade dips shall <br /> be placed in areas where the natural roll of the land or change in trail grade may need <br /> to be accentuated. Rolling grade dips shall be constructed whenever surface water <br /> control structures are needed unless the Owner approves a knick or other drainage <br /> structures. <br /> Profile and Oblique views of a Rolling Grade Dip: <br /> ;;n!!% _, <br /> - '•� Knick outsiope 15%maximum <br /> Ramp outsiope 5% <br /> t, <br /> .els 6 <br /> -------------- <br /> d$ <br /> ----------I- � <br /> Ramp Knick 6—10 feet <br /> 10—20 feet <br /> Source: Trail Solutions:IMBA'Guide to Building Sweet Single Track,2004 <br /> C. A knick is a semi-circular, shaved section of the trail about 10 feet in diameter on the <br /> downhill side of the trail tread. The center of the knick is outsloped at about 15%.A <br /> knick is typically used where there is a low area for the water to drain to and where <br /> water has or may tend to puddle. <br /> Profile and Oblique views of a Knick: <br />