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<br />ROCK RIPRAP PROTECTION - <br />BANKLINE AND WINDROW REVETMENTS <br /> <br />Bankllne Revetment - nils protection method consists of protecting the lower underwater <br />slope with stone fill to prevent undercutting of the banks. This method should be used <br />along shorelines wher.e the lower bank material Is very erosive, such as a sandy material. <br />Stone fll led tiebacks should be placed Intermittently to provide erosion protection to the <br />upper bank and prevent river flows from eroding In behind the lower slope protection. <br /> <br />----{{ <br /> <br />> <br /> <br />BANKLlNf <br /> <br /> <br />-&:r------ <br />"""":"Ii~'I;~~~;------ ------ <br />..,~,"::~~.......,."",,,.,,,,,,,,,,,,~~:,,:,,,,,,., ..... <br />"~ <br /> <br /><:--- <br /> <br />"""~ <br /> <br />BoW _ <br />...---" <br /> <br /> <br />A/ormo/ <br />Wafer Surface <br /> <br />Stone Fill <br /> <br />~- <br /> <br />TYPICAL SECT/ON <br /> <br />Windrow Revetment - This erosion control method consists of placing stone along the top of <br />the existing bankllne at a predetermined locatIon beyond which additional erosion would <br />not be permItted. Rlprap has also been used effectively with a ''Trench-Fill Technique." <br />Along with bank grading, a trench Is excavated at the base and fll led with rlprap. Both <br />the surface and trench-fl I I methods consist of placing (or burying) a sufficient amount of <br />stone fll I In a windrow behind the top of the bankllne, then permitting the area between <br />the natural riverbank and the windrow to erode through natural processes, untIl It reaches <br />and undercuts the supply of stone. As the stone Is undercut It falls Into the eroding <br />area and provides protection against further undercutting. The resulting bankllne would <br />remain In a near natura' state with an Irregular appearance. Portions of the stone fil I <br />windrow that are not eroded Into the river by the natural process would be available for <br />relocation to severely eroding areas at a later date. The wIndrow revetment Is <br />recommended for use In light forested areas and along stretches of Irregular bank I Ine. <br /> <br />13 <br />