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Custom Soil Resource Report <br />Very low: 0 to 3 <br />Low: 3 to 6 <br />Moderate: 6 to 9 <br />High: 9 to 12 <br />Very high: More than 12 <br />Backslope <br />The position that forms the steepest and generally linear, middle portion of a <br />hillslope. In profile, backslopes are commonly bounded by a convex shoulder <br />above and a concave footslope below. <br />Backswamp <br />A flood -plain landform. Extensive, marshy or swampy, depressed areas of flood <br />plains between natural levees and valley sides or terraces. <br />Badland <br />A landscape that is intricately dissected and characterized by a very fine drainage <br />network with high drainage densities and short, steep slopes and narrow <br />interfluves. Badlands develop on surfaces that have little or no vegetative cover <br />overlying unconsolidated or poorly cemented materials (clays, silts, or <br />sandstones) with, in some cases, soluble minerals, such as gypsum or halite. <br />Bajada <br />A broad, gently inclined alluvial piedmont slope extending from the base of a <br />mountain range out into a basin and formed by the lateral coalescence of a series <br />of alluvial fans. Typically, it has a broadly undulating transverse profile, parallel to <br />the mountain front, resulting from the convexities of component fans. The term is <br />generally restricted to constructional slopes of intermontane basins. <br />Basal area <br />The area of a cross section of a tree, generally referring to the section at breast <br />height and measured outside the bark. It is a measure of stand density, commonly <br />expressed in square feet. <br />Base saturation <br />The degree to which material having cation - exchange properties is saturated with <br />exchangeable bases (sum of Ca, Mg, Na, and K), expressed as a percentage of <br />the total cation - exchange capacity. <br />Base slope (geomorphology) <br />A geomorphic component of hills consisting of the concave to linear <br />(perpendicular to the contour) slope that, regardless of the lateral shape, forms <br />an apron or wedge at the bottom of a hillside dominated by colluvium and slope - <br />wash sediments (for example, slope alluvium). <br />Bedding plane <br />A planar or nearly planar bedding surface that visibly separates each successive <br />layer of stratified sediment or rock (of the same or different lithology) from the <br />preceding or following layer; a plane of deposition. It commonly marks a change <br />78 <br />