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First bottom <br />An obsolete, informal term loosely applied to the lowest flood-plain steps that <br />are subject to regular flooding. <br />Flaggy soil material <br />Material that has, by volume, 15 to 35 percent flagstones. Very flaggy soil <br />material has 35 to 60 percent flagstones, and extremely flaggy soil material has <br />more than 60 percent flagstones. <br />Flagstone <br />A thin fragment of sandstone, limestone, slate, shale, or (rarely) schist 6 to 15 <br />inches (15 to 38 centimeters) long. <br />Flood plain <br />The nearly level plain that borders a stream and is subject to flooding unless <br />protected artificially. <br />Flood-plain landforms <br />A variety of constructional and erosional features produced by stream channel <br />migration and flooding. Examples include backswamps, flood-plain splays, <br />meanders, meander belts, meander scrolls, oxbow lakes, and natural levees. <br />Flood-plain splay <br />A fan-shaped deposit or other outspread deposit formed where an overloaded <br />stream breaks through a levee (natural or artificial) and deposits its material <br />(commonly coarse grained) on the flood plain. <br />Flood-plain step <br />An essentially flat, terrace-like alluvial surface within a valley that is frequently <br />covered by floodwater from the present stream; any approximately horizontal <br />surface still actively modified by fluvial scour and/or deposition. May occur <br />individually or as a series of steps. <br />Fluvial <br />Of or pertaining to rivers or streams; produced by stream or river action. <br />Foothills <br />A region of steeply sloping hills that fringes a mountain range or high-plateau <br />escarpment. The hills have relief of as much as 1,000 feet (300 meters). <br />Footslope <br />The concave surface at the base of a hillslope. A footslope is a transition zone <br />between upslope sites of erosion and transport (shoulders and backslopes) and <br />downslope sites of deposition (toeslopes). <br />Forb <br />Any herbaceous plant not a grass or a sedge. <br />Custom Soil Resource Report <br />39 Index #10