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<br />Yarnell equation yie~ds DlOre satisfactory results for the type of :flow <br /> <br />shown in Figure 3&. The Yarnell equation is <br /> <br /> <br />.yo OK (<+ ~:,' - 0.6) [ ~ · " (~rJ <br /> <br />2 <br />v3 <br />28 <br /> <br />(7) <br /> <br />where <br /> <br />lJ.y . y~ - Y3 . difference between upstream and downstrelllD. wa'ter <br />surface e~eva.tions <br /> <br />K <br /> <br />. expermental pier-sbape,coefficient <br /> <br />ValUES for K are given in Tab~e ~. <br /> <br />9 <br />