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<br />29 <br /> <br />. <br /> <br />divide -- the region of higher ground ,which lies between tl'lO <br />non-communicating. drainage systems. <br /> <br />. <br /> <br />drainage basin -- the area of surface water collection,of a <br />stream or stream system. <br /> <br />evapotranspiration -- the evaporation and transpiration of water <br />from plants. <br /> <br />flood -- st-ream flow which overtops the natural or art;ificial <br />banks along any reach of the s~ream. <br /> <br />flood design -- the magnitude of flow that a sturcture is built <br />to wi ths tand. <br /> <br />flood plain -- that portion of a river valley, adjacent to the <br />river channel, ~.Jhich is' built of sediments during the <br />present regin~en 'of the stream and wThich is covere.d t.Jith <br />water when the river overflows its banks. <br /> <br />flood probability -- the probability of occurrence of a flood of <br />given size in any given' year; the 1/50 pr'obability flood <br />is a magnitude of flood that has one chance in fifty of <br />occurrence in any given year. <br /> <br />~ <br /> <br />Foxhills sandstone -- buff to light grey, silty sandstone with <br />interbeds of black to grey shale. <br /> <br />Holocene -- the portion of geologic time following the Pleistocene <br />epoch. <br /> <br />hydraulic radius (R) -- cross section area 'divided by the wetted' <br />perimeter (R = A/P). <br /> <br />Laramie forma tion -- 0 Ii ve grey,. 5 i lty sha Ie; contains Ientieu lar <br />bed of sandstone, clay and ,seams of coal. <br /> <br />loam -- e soil containing approximately 45 percent sand, 40 per- <br />cent silt and 15 percent clay. <br /> <br />magnitude -- the vo,lClme of the flow of water. <br /> <br />mean -- arithmetical mean; middle value between two extr~mes. <br /> <br />Niobrara formation -- Calcareous, chalky shale, contains thick <br />marl beds and a persis~ent basal chalky limestone bed. <br /> <br />peak flow -- maximum flood discharge. <br /> <br />, <br /> <br />pediment -- gently inclined planate' e~bsion surface carved in <br />bedr.o'ck and generally ven'cered with stream g~avels. <br /> <br />Pierre share -- clark grey shale with interbedded san'dstohe <br />membc rs. <br />