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Custom Soil Resource Report <br /> 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 /> 45 <br />