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165 <br /> Water bars are usually installed after regular use of the forest road or skid trail has ended. <br /> A high relief water bar (three feet or greater in height) will serve as a deterrent for normal <br /> vehicle traffic. Water bars should be stabilized with grass seeding/mulching or volunteer <br /> growth at the time of project closeout. Armoring the water bars with crushed stone should <br /> be considered under circumstances of steep grades and highly erodible soils. After the <br /> tract is closed and before vegetation has fully re-colonized and stabilized the water bar, it <br /> is important to check in periodically to be certain a major storm flow event has not <br /> damaged the water bar and rendered it nonfunctional. <br /> Water Bars <br /> tl.dgln.l peed ivr[a♦ <br /> di <br /> 1. Walled af(er regular use of road or trail. <br /> Tnnk <br /> :t <br /> No OU1101 No. - <br /> Broad-based Dips <br /> As its name implies, a broad-based dip is a broad earthen dip-hump combination built <br /> into the surface of a flat or insloped access road. The dip forms a reverse or outsloped <br /> cross-drain to divert flowing water from one side of the roadway to the other. This <br /> structure is usually applied to haul roads with slopes less than 12%. The dip is preferred <br /> over the water bar as it allows truck traffic to maintain a fairly uniform speed traversing <br /> the tract as opposed to the stop and go, "speed bump" characteristics of the water bars. A <br /> broad-based dip is not a substitute stream crossing method but rather a method to control <br /> transport of water from a paralleling road should ditch on one side of the road to the <br /> other. Slope of the land again dictates the spacing of this BMP as follows: <br /> Road Grade(%)) Broad--Based Dip Spacing <br /> 2-4 200-300 <br /> 5-7 160-180 <br /> 8-10 140-150 <br /> 12 <br />