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<br />stetlstlcel analyses of streamflo~ records and analyses of raln- <br />fell and runoff characteristics In the general region of the <br />~atershed. <br /> <br />I <br />I <br /> <br />Sheet flow <br /> <br />The water whiCh Is diverted from the meln floodflOw by <br />obstructions end varlences In topography. ThiS water flows at <br />shallo~ depths and normally at elevetlons different from the water <br />flowing In the adjacent channel or on the adjacent flood plain. <br />Oue to the shallow depths and Irregular flow patterns essoclated <br />with this type of flow, computatIons to predict flow depth are <br />consIdered ImpractIcal. <br /> <br />TopofWaterwav <br />This 15 the roof of the opening In a stream crossing <br />through whIch water flows under nOnMl conditions. It Is the <br />underside of thedeckspan-sornetlrooscalled "Iowsteel",the <br />roof of a box culvert, or the crown of an arched or circular <br />culvert. <br /> <br />. <br /> <br />31 <br />