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0 Water Bars <br />Introduction <br />Earth-berm water bars are narrow, earthen ridges built across roads or trails. They divert <br />water off and away from roads or trails into vegetated areas before it causes erosion. <br />When properly built, they prevent exposed soil from moving, protecting the area until it <br />is revegetated. <br />Where Used <br />Earth-berm water bars are usually built on closed logging roads and trails, since they are <br />hard to drive over and wear down quickly. They can be used on skid trails during <br />logging, particularly when broad-based dips and other measures aren't feasible. <br />Practice Description <br />To build an earth-berm water bar, excavate a trench at a 30- to 45-degree angle across the <br />traffic surface. Use the excavated material to build a berm on the downhill side of the <br />trench. (You may use logs to re-enforce an earth-berm water bar or to substitute for part <br />of the soil needed in rocky areas.) Make the top of the berm at least 12 inches higher than <br />the bottom of the trench. Make sure the outlet of the trench is at least 3 inches lower than <br />• the upper end. <br />Extend water bars slightly beyond both ends of the road to keep water from flowing <br />around them. Direct diverted water into a stable, vegetated area, not into open water. To <br />make a water bar easier to drive over, widen it by increasing the distance between the <br />bottom of the dip and the top of the berm, maintaining the correct height. <br />Space earth-berm water bars according to the grade. Your state's BMP guidelines will <br />contain information about correct spacing of water bars in your area. <br />Water bar installation <br />?ross3egpn <br />?. r <br />9.4fl <br />3.4fl <br />3.4#