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<br />TREE RETARDS <br /> <br />i '> <br /> <br /> <br />{ <br /> <br /><no <br /> <br />""'"'' <br /> <br /> <br />"'''II'!I''I~'"U' '~I,'" li-:::l::',:':': <br /> <br />'1IIiI'~"'~'''''' <br /> <br />I; <br />'/. \ \\ ,,' 11 <br />.'\ \ a,,~ <br />! \ ~~/"\",,-y. <br />~! - ~------ _ j /A~::2~ <br />L "i;~ -------- --- '-<5--1 "I~:::':::"'\'\ <br />,__Cobles '''''<'' I" ' <br />j Ii'~~\ \, -........_~_ <br />..../,' 1\ ;I~\\\~""""~..oc----""' Flow <br />-- I y\\.. \\\4..,--" --__ <br />(2v--n(~ )\::'~I \ x~_~_/ <br />~ r" ~r \ 't-.. <br />r(l 1\ I <br /> <br />"111,'/11'1"'" <br /> <br />'\ \~ <br /> <br />/ '.,''''''''''''' <br />; / <br />// <br /> <br />...--- <br /> <br />/~; <br />_/ <br />~; <br /> <br />stone Fill <br /> <br />SSgal. Stee/d", <br />fJlled with concrete <br />serV'es as vert: anchor. ~ <br /> <br /> <br />I, _____ Cable <br />TYPICAL SECTION <br /> <br />/,~~s:<::;----- <br /> <br />Th Is ercs Jon contro I method cons I sts of pi ac I 09 trees hor I zonta I J y in the river and <br />perpendicular to the riverbank. Approximately 30- to 40-toot trees are placed and anchored <br />at the shoreline with stone fill and concrete or other type of deadmen. The branched <br />portion of the trees wI II be resting on the bed of the rIver to protect the banks from <br />dtrect river attack and to encourage the collection of debris. ThIs type of protection Is <br />recommended for use In or near forested areas where a supply of trees would be avai lable. <br />Tree retards are an attempt to reproduce natural conditions that occur when trees along <br />the shoreline are undercut by erosion, fall Into the stream, and form a natural barrier <br />against further erosion. <br /> <br />ADVANTAGES: I) I nexpens Ive. <br /> 2) Good job deflecting flow. <br /> 3) Good debris collector with silt depositor. <br />DISADVANTAGES: 1) Replacements are frequent. <br /> 2) Protection Is only marginal. <br /> <br />19 <br />