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<br />STREAMBANK PROTECTION EXAMPLES <br /> <br />Streambank protect i on pract i Cl:~S are genera I I y used In <br />reaches of a stream \oIh i ch have a s.l:ab I e channe I bottom, If <br />the channel bottom is not stable, other typ",s of praGtices <br />may be more beneficial, Streambank protection practices are <br />used to keep a streambank from eroding and causing meanders <br />in a stream, Some of these types of practices can also be <br />used to help heal existing meanders by slowing the velocity <br />and allowing sedimentations to occur in the eroded a,'ea, <br /> <br />The practices described in th'i> following pages (see <br />"Summary of Practices") are some types of measures which can <br />be used to protect streambanks, Also included are measures <br />that were not considered, in this ",tudy, yei: may be a <br />possible solution to streambank problems. <br /> <br />A few requirements are common to al I types of <br />streambank protection, The toe of any kind of bank <br />protection must extend below the cannel to a depth which <br />wi I I ensure that scouring wi I I not undercut the toe of the <br />practice. The upstream and downstream ends of the bank <br />protection must be stable. This can be acc()mpl ished by <br />tying the ends of the practice into stable reaches of the <br />top of the bank. However, it is usually acceptable to <br />extend it only up the bank to one foot above the high water <br />elevation. This elevation must be determinE.d by a detailed <br />hydrologic and hydraul ic analysis of the st,.eam, <br /> <br />SUMMARY OF PRACTICES <br />Streambank Protection Practice <br /> <br /> Cost PEl r Expelcted <br />St,"uctura I Practices Foot Life' (y r?) i2Jl,M <br />lL <br />Rock Riprap 100 ~iO 2 <br />Anchored Trees 20 15 <br />Rock Jetty 200 :;iO 4 <br />Jacks 10 40 3 <br />Ve(letat i ve Practices <br />Vegetated Buffer Strips 10 50 2 <br />Vefletat i ve Sprig Revetment 5 ~iO 5 <br />Riparian Zone 2 :;,0 5 <br /> <br />1/ O&M is expressed as a percentage of the original <br />construction cost, <br /> <br />31 <br />