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Custom Soil Resource Report <br /> Dip slope <br /> A slope of the land surface, roughly determined by and approximately <br /> conforming to the dip of the underlying bedrock. <br /> Diversion (or diversion terrace) <br /> A ridge of earth, generally a terrace, built to protect downslope areas by <br /> diverting runoff from its natural course. <br /> Divided-slope farming <br /> A form of field striperopping in which crops are grown in a systematic <br /> arrangement of two strips, or bands, across the slope to reduce the hazard of <br /> water erosion. One strip is in a close-growing crop that provides protection from <br /> erosion, and the other strip is in a crop that provides less protection from <br /> erosion. This practice is used where slopes are not long enough to permit a full <br /> striperopping pattern to be used. <br /> Drainage class (natural) <br /> Refers to the frequency and duration of wet periods under conditions similar to <br /> those under which the soil formed. Alterations of the water regime by human <br /> activities, either through drainage or irrigation, are not a consideration unless <br /> they have significantly changed the morphology of the soil. Seven classes of <br /> natural soil drainage are recognized—excessively drained, somewhat <br /> excessively drained, well drained, moderately well drained, somewhat poorly <br /> drained, poorly drained, and very poorly drained. These classes are defined in <br /> the "Soil Survey Manual." <br /> Drainage, surface <br /> Runoff, or surface flow of water, from an area. <br /> Drainageway <br /> A general term for a course or channel along which water moves in draining an <br /> area. A term restricted to relatively small, linear depressions that at some time <br /> move concentrated water and either do not have a defined channel or have only <br /> a small defined channel. <br /> Draw <br /> A small stream valley that generally is shallower and more open than a ravine <br /> or gulch and that has a broader bottom. The present stream channel may <br /> appear inadequate to have cut the drainageway that it occupies. <br /> Drift <br /> A general term applied to all mineral material (clay, silt, sand, gravel, and <br /> boulders)transported by a glacier and deposited directly by or from the ice or <br /> transported by running water emanating from a glacier. Drift includes <br /> unstratified material (till) that forms moraines and stratified deposits that form <br /> outwash plains, eskers, kames, varves, and glaciofluvial sediments. The term is <br /> generally applied to Pleistocene glacial deposits in areas that no longer contain <br /> glaciers. <br /> 41 <br />