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<br /> <br />-- <br />PLANTING FOR CLEAN WATER'. <br /> <br />Planning Worksheet 6: <br />Site Preparation and Planting <br /> <br />p. 3 of 8 <br /> <br /> <br /> <br />EROSION CONTROL <br />Seawall / Retaining Wall <br />or Rip Rap (large boulders) <br /> <br />Erosion Control Fabrics <br />& Cococut Fiber Rolls <br /> <br />For wet transition areas <br />- bare soil or weak turf <br />need protection from run- <br />off and/or wave erosion <br />while plants become established. <br /> <br />For shoreland projects, always use <br />blankets and stakes that are com- <br />pletely biodegradable. <br /> <br />Erosion-control fabrics are avail- <br />able from commercial sources. See <br />"Planning Worksheet 7: Addition- <br />al Resources" for a list of vendors. <br /> <br />Rip rap, seawalls/retaining walls are NOT <br />RECOMMENDED ON MOST SHORELINES. <br />Where they exist along shorelines, under- <br />cutting is often followed by wall failure. Rip <br />rap or a wall may also deflect wave energy <br />to adjacent shorelines resulting in increased <br />erosion. <br /> <br />Cococut fiber rolls are a "soft armor" <br />erosion control structure that is ef- <br />fective in areas of low to moderate <br />shoreland erosion. It is a dense "Iog" <br />of coconut fiber wapped in a coarse <br />.. jute net and lor burlap. They come in <br />"'. II h <br />~'j11 8", 12" and 20" diameter ro s. W en <br />- - a roll is secured along the toe of an <br />undercut/eroding shore, it provides protection from further wave erosion. <br /> <br />"' <br /> <br />Fiber blankets are also a "soft armor" fabric that can be made from many dif- <br />ferent materials and of different weaves. Examples include a coarsely woven <br />jute, coconut fiber sandwiched between a cotton net, coconut fiber sand- <br />wiched between photo-degradable plastic net, straw sandwiched between <br />net, and excelsior (packing material made from wood shavings) sandwiched <br />between net. Choose a 100% biodegradable material suited for the character- <br />istics of your site (steepness, amount of runoff, etc.). <br /> <br />Coir (coconut fiber) is known for its longevity. Coir fabrics come in mul- <br />tiple brands and forms. For shoreline projects, there are two types that are <br />more commonly used and that work in all three shoreline zones. The first is <br />a loosely packed blanket of coir fibers within a biodegradable natural fiber <br />net. It works especially well within the transitional zone. Plants can be easily <br />