Figure 2.21. Changes in water surface resulting from an increase in bed elevation.
Figure 2.22. Specific discharge diagram.
To determine the value of y for qmax Equation 2.137 is rearranged to obtain:
q = y 2g(h - y)
(2.145)
The differential of q with respect to y is set equal to zero.
q (2H - 3y)
dq
=0=
(2.146)
2 (H - y)1/ 2
dy
2.41
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