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<br />Methods I:or Controlling Erosion <br /> <br />e <br /> <br />FIGURE 4 -15 <br /> <br />Fence <br /> <br />High lIanldine <br /> <br /> <br />Brace Boarcls <br /> <br />16' Typical <br /> <br /> <br />Lateral <br />Boarcls <br /> <br />10' Ave <br />I <br />I <br /> <br />14-16' Typical <br /> <br />-I <br /> <br />Refusal at <br />Upstream End <br />and Tiebacks <br />Not Shown <br /> <br /> <br />T <br /> <br /> <br />Varies <br /> <br />Stone Toe <br /> <br /> <br />N.W.S. <br /> <br /> <br />Tieback <br /> <br />Fence <br /> <br />4.6 Erosion Reduction Methods. <br /> <br />The structures listed below function by reducing the ability of the river to erode bed and <br />bank ma:eria!. In the case of vanes and fence revetments, this is accomplished by <br />reducing boundary shear and secondary helical cwrents. Selective clearing and <br />snagging and chute closures both function by reducing the most severe flows along <br />eroding banks. Vanes and fences do very little to the morphology of the river. Sediment <br />transport may be slightly reduced in the immediate vicinity of the structures, but this is <br />of little ,;onsequence. They are intended to have minimal impact upon the channel <br />geometr). On the other hand, clearing and snagging and chute closures can both have a e <br /> <br />44 <br /> <br />Coloraoo Erosion Control Manual <br />