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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 stripcropping 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 />stripcropping 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 />Custom Soil Resource Report <br />35 Index #10