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<br />Methods For Controlling Erosion <br /> <br />e <br /> <br />completely "locked in". TIleS are also used to consb1Jct bulkheads. with or without <br />vegetatioll. <br /> <br />Toe mats. shown in Figure 4 - 9. do not provide much in the way of environmental <br />enhancement They are not aesthetically pleasing. However. once sediment has <br />accumulaed in the tires and vegetation is established the bank may have a naturaI <br />appearame. Wildlife access is often improved because the previously eroding bank is <br />flattened. Because tires are a readily-available. low-cost material. sb1Jctures utilizing <br />tires have been widely used. Most failures of this sb1Jcture type are related to poor <br />anchorinB. TIleS should have holes drilled into the sidewalls so that trapped air can <br />escape. Tile costs of tire mats varies greatly due to the fact that construction is very <br />labor intellsive. Material casts range from 10-40 dollars per linear foot. <br /> <br />FIGURE 4. 9 <br /> <br />TIre mat <br /> <br />Varies <br /> <br /> <br />Flow _ <br />lires Under Stone Backfill (not shown) <br />Strand Anchor <br /> <br />Streambed <br /> <br />." <br />Iii <br />t> <br />'" <br /> <br />Broken Concrete <br />Streambed <br />NW.S. <br /> <br /> <br />Existing <br />BankJine <br /> <br />r Soil Layer <br /> <br />Willows <br /> <br />Stone ~ 8 <br />arias <br />J.. w <br />Varies - 'Ii <br />> <br /> <br /> <br />IVon4H <br />Random Fill <br />Anchor <br />Anchor <br /> <br />Tree and Brush Revettnents - This type of streambank erosion protection utilizes larger. <br />locally available trees or brush cuttings placed along the eroding bank. Trees and brush _ <br />are alig",:d along the bank with the branches pointing downstream and are anchored to . <br /> <br />36 <br /> <br />Colorado Erosion Control Manual <br />