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<br />TIMBER CRIBS <br /> <br />4 ~ <br />~ \ Sfy~1 I~__~ <br />6- r~ W9~."""'" .""" <br /> <br />""II;j,1';~"".,.. .of"" <br />../II" "Ndl'~ ~lII/'''' "1I11~'" <br />".."rll" "........,/11,... <br />"NI~'""",,~",'llr"". <br /> <br />(,;;; <br />~~~~~) <br />~ <br />__.......,jjrrl,iII.( -_ <br />.... '''''''' ~- <br /> <br />"''''1110".. <br /> <br />\. ~ <br />\'\ <br />\" <br />"'" <br /> <br /> <br />\ I, <br />\ \ <br /> <br />""""'" <br /> <br />II <br /> <br />j/ <br /> <br />I <br />i <br />, <br /> <br />I <br />,I <br />\ <br /> <br />-~ <br /> <br />/~/-- <br />"- <br /> <br />~ <br /> <br />,,/ <br /> <br />Backfill <br /> <br />7imfxrs <br /> <br />" <br /> <br />Normal <br />Water <br />Surface <br /> <br />, <br /> <br />'.. <br /> <br />--- <br /> <br />TYPICAL SECT/ON <br /> <br />Stream banks can be protected directly with timbers or railway ties cabled to deadman and <br />earth or stone-filled. The cribs then will be aligned away from the streambank. This <br />method has been used primarily on small streams and is now being used on a limited basis <br />In the western United States. <br /> <br />ADVANTAGES: <br /> <br />1) <br /> <br />Lends Itself to protecting short reaches. <br /> <br />2) Can be constructed of materials that are readily available. <br /> <br />3) Structure Is easily repaired. <br /> <br />01 SADVANTAGES: 1) Structura I I ntegr Ity depends upon adequate toe protect Ion. Vertl ca I <br />waf Is Induce severe scour at their base. <br /> <br />2) Limits use and access to river. <br /> <br />. <br /> <br />COSTS: $200/bank-foot of protection. <br /> <br />MAINTENANCE REQUIREMENTS: Repair of pilings after high water and storms. <br /> <br />ENVIRONMENTAL ASPECT: This protection method has the least aesthetic value In presenting <br />a natural landscape. The method would protect existing wi Idl Ife habitat and might provide <br />attachment sites for aquatic organisms. This method is used in urban areas due to the <br />shortage of Installation space, intense wave action from boats~ and a need for <br />recreational access. <br /> <br />29 <br />