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Custom Soil Resource Report <br />Diversion (or diversion terrace) <br />A ridge of earth, generally a terrace, built to protect downslope areas by diverting <br />runoff from its natural course. <br />Divided -slope farming <br />A form of field striperopping in which crops are grown in a systematic arrangement <br />of two strips, or bands, across the slope to reduce the hazard of water erosion. <br />One strip is in a close -growing crop that provides protection from erosion, and the <br />other strip is in a crop that provides less protection from erosion. This practice is <br />used where slopes are not long enough to permit a full striperopping pattern to be <br />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 they <br />have significantly changed the morphology of the soil. Seven classes of natural <br />soil drainage are recognized —excessively drained, somewhat excessively <br />drained, well drained, moderately well drained, somewhat poorly drained, poorly <br />drained, and very poorly drained. These classes are defined in the "Soil Survey <br />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 or <br />gulch and that has a broader bottom. The present stream channel may appear <br />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 boulders) <br />transported by a glacier and deposited directly by or from the ice or transported <br />by running water emanating from a glacier. Drift includes unstratified material (till) <br />that forms moraines and stratified deposits that form outwash plains, eskers, <br />kames, varves, and glaciofluvial sediments. The term is generally applied to <br />Pleistocene glacial deposits in areas that no longer contain glaciers. <br />Drumlin <br />A low, smooth, elongated oval hill, mound, or ridge of compact till that has a core <br />of bedrock or drift. It commonly has a blunt nose facing the direction from which <br />the ice approached and a gentler slope tapering in the other direction. The longer <br />axis is parallel to the general direction of glacier flow. Drumlins are products of <br />28 <br />