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)
The differential of q with respect to y is set equal to zero.
q (2H - 3y)
2 (H - y)1/ 2