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<br />"espectlvely, The flood may occur In any ye<lr. It Is b<lsed on <br />statistical analyses of str(j(lmflow records and analyses of ..aln- <br />fall <lndrunoffcharact&ristlcs In the gene"lIl region of the <br />w<ltershed. <br /> <br />SheatFlo.. <br />The wate.. which is diverted from the main floodflo.. by <br />obst..uctions and variances in topography. This wate.. flows at <br />sMllow depths and normally at elevations different fromthe..ater <br />flo..lng in the adjacent channel or on the adjacent flood plain. <br />Due to the shallo....depths and 1rregularflo....patte..nsassoclated <br />..ith this type of flow, computations to pred1ct flow depth are <br />con",ldered Imp"actlcal. <br /> <br />Top of Waterway <br />This Is the ~f of the opening 1n a st..eam crossing <br />throughwh1ch "ater flo"s under nonnal condItions. It Is the <br />undersldeofthedeckspan-sometlrnescalled"lowstool",the <br />roof of a box culve..t, or the croWn of an arched or ci..cular <br />cu1vort. <br /> <br />" <br />