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Y1 Y2 = flow depth at bridge ≈ Y1 +ds −3 / 7 τc τc 0.25 d Y2 β 6 / 7 β 1 / m 1 − = 8.375 + Gill (1972) Equation given at the threshold τ1 τ1 Y1 Y1 condition F1=Froude number of the approach flow upstream of the abutment; Fc=critical F Sturm and ds = 7.7 1 − 0.35 MF Janjua Froude number for initiation of motion; Yf (1994)
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