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and highly erosive soils, such as very fine sands and silts. This will allow a long sediment <br />deposition zone at the bottom of the slope for vegetation to establish. <br />Long slopes in excess of 50 to 100 feet, and moderate to steep slopes that are <br />greater than 5h:1 v, should be broken with some type of slope interruption. Runoff from <br />long slopes forms concentrated flow and gullies, so the length of slope and drainage area <br />should be broken into small drainage waterways and basins. These waterways and <br />ridges, in conjunction with slope shape and other microtopographic features, will break a <br />slope and concentrate the runoff in basins where a good vegetative cover will form. <br />Where possible, tie into existing drainages and low points above and below the <br />disturbance. Grading of waste dumps and tailings may be limited and structures such as <br />terraces maybe the only option for breaking the slopes. <br />Installation <br />To create slope shape, start with the average (from toe to crest) slope angle <br />desired, using all materials that go into the fill. Any compaction requirement should be met <br />in this shape. Push material to create and finalize the concave shape. <br />Problems may occur if: <br />¦ Crest is not steep enough. Overland flow from the undisturbed area <br />above the disturbed site may saturate or seep into the fill at the crest of <br />the slope. <br />¦ Slopes are very steep. As material is pushed up the slope, the soil at the <br />crest of the slope may be at the angle of repose. This will result in settling. <br />¦ Equipment operators are not instructed that the toe will be flatter and the <br />crest of the slope will be steeper than the overall slope angle. <br />Maintenance <br />Restrict vehicle use of area. <br />12_0 „