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© Outslope <br /> As the trail contours across a hillside, the downhill or outer edge of the tread should tilt slightly down and <br /> away from the high side. This tilt is called outslope,and it encourages water to sheet across and off the trail <br /> instead of funneling down its center. <br /> Outslope is one reason why contour <br /> trails last for years and years. IMBA Sheet Flowa <br /> recommends that all trail treads be <br /> built with a 5-percent outslope. moi` <br /> Outslope can be difficult to <br /> maintain in loose soils. Tires, feet, <br /> and hooves constantly compact the � lli <br /> 5%Tread Outslope <br /> center of the trail and push loose soil :�� <br /> to the sides, creating a concave �4. j�', �/ <br /> tread. Frequent grade reversals are , ` <br /> N �" <br /> essential in order for water to drain �,'' <br /> in this situation. ,\'..k a -. <br /> IPA <br /> wg \ <br /> OutslopeL , <br /> 1 4," Above:An outsloped trail <br /> tread allows water to drain in <br /> a gentle, non-erosive manner <br /> "sheet flow." <br /> N5% Outslope b , P•f <br /> py <br /> y . <br /> v< 5% Outslope <br /> ^;fie / s ;',,\�. `+/ <br /> 69 <br /> Part Three: Principals of Sustainable Trails <br />