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Open channel applications include bank stabilization, flow and grade control, scour protection for bridge piers, and biostabilization.The primary mechanism of protection employed is an increase in the relative roughness of the channel bank (as characterized by the Manning's Roughness Coefficient); the Manning's n is relatively high at 0.1.
Cribbing is usually accomplished with blocks of wood, often 4×4 (3 + 1 ⁄ 2 in or 89 mm) or 6×6 (5 + 1 ⁄ 2 in or 140 mm) and 18–24 in (460–610 mm) long.Soft woods, like spruce and pine, are often preferred because they crack slowly and make loud noises before completely failing, whereas stiffer woods may fail explosively and without warning.
Story – A post only one story tall as in "storeyed construction" [12] also known as platform framing. Prick – 1) Same as story post, a one-story post for extra support at a particular location; 2) In a roof truss a side post. [13] Ridge – A post extending from the ground or foundation to the ridge beam.
Early research (Bathurst and Jarrett, 1988) [13] found that cellular confinement reinforced gravel bases are "equivalent to about twice the thickness of unreinforced gravel bases" and that geocells performed better than single sheet reinforcement schemes (geotextiles and geogrids) and were more effective in reducing lateral spreading of infill under loading than conventional reinforced bases.
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