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<br />TIMBER CRIBS <br /> <br />~ ] <br />~~&ylf' ',?----- - (~ <br />~J r~ w9~, ... ~~--- <br /><l1I;;J\'r'III' <br /> <br />~rllll ,,'Q/l11 "II \ 1\ 1\ I <br /> <br />----------- <br /> <br />\\~ <br /> <br /> <br /> <br />I~ II, <br /> <br />. ! <br />. I I <br />~-' <br /> <br />..,,"~'''~'''2'~',! <br /> <br />Streambanks can be protected directly with timbers or railway ties cabled to deadmen and <br />earth or stone-f II led. The cribs then will be aligned away from the streambank. Th Is <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 />I) <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 />DISADVANTAGES: 1) Structural Integrity depends upon adequate toe protection. Vertical <br />waf Is induce severe scour at their base. <br /> <br />2) limits use and access to river. <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 Ita 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 />