Agenda - 05-26-2015 - C-1 - Laserfiche WebLink

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61 Key points to remember during the installation phase include installing the dip at a 30- degree downslope, tying the upper end of the dip into an adjacent bank to avoid water by- passing the dip,providing a cross-drain outslope of about 3%, and energy absorbers as described in the water bar discussion. On highly erodible soils,the broad-based dip should be armored with crushed stone or rock ballast. Wafter Turnouts Water turnouts can be a ditch, trench,or other conveyance used to divert stormwater runoff away from a road surface or adjacent ditch. The turnout, which can be the width of a backhoe bucket or a bulldozer blade, carries water into undisturbed areas of vegetation to both dissipate energy and disperse water flow to the forest floor. Water turnouts should intersect a ditch line at the same depth and be outsloped 1-3%. On sloping roads, turnouts should be 30-45 degrees downslope. The use of water turnouts is often dependent on gradient of the property and availability of suitable outlets. Water turnouts should be spaced at a distance to provide good road drainage thus avoiding water pooling which can lead to soil compaction, souping, or rutting. A water turnout can have a secondary application of functioning as a minor sediment trap, therefore, maintenance is important to ensure the turnout is neither suUiect to erosion itself from excessive runoff events or sedimentation to the point of becoming nonfunctional. As with other water control structures covered in this section, tract closure should include perennial grass seeding/mulching or volunteer vegetation growth to enhance long-term stability of the turnout. Most importantly, water turnouts must not empty directly into streams or other water channels (i.e., drainage ways, ditches, channalized streams, etc.) leading directly to streams and other waters of the State. Water Tur170U ul 13