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<br />re~pectlva'y. The flood m~y occur In any year. <br />statistical analyses of streamflow records ~nd <br />fallan.Jr'Jnoffchilrilctoristlcs In the general <br />watershed. <br /> <br />It Is basad on <br />analysa~ 01 raln- <br />regional the <br /> <br />SheatFlow <br />The water which Is diverted froothllrrl/lln f 10000f low by <br />obstructions and varIances In topography. This water flows at <br />shallow depths and nOnnllllyatelevatlonsdlfferent from the water <br />flowing In the adjacent channel or on the adjacent flood plain. <br />Due to the shellow depths and Irregular flow patterns associated <br />with this type of f)ow, computations to predict flow depth are <br />consIdered ImpractIcal. <br /> <br />Top of Waterway <br />This Is the roof of the opening In a stream crossing <br />through which water flows under normal conditIons. It Is the <br />undersideoftMdeckspan-sometlmascalled"lowsteel",the <br />roof of " box culvert, or the crown of an arched or circular <br />culvert. <br /> <br />26 <br />