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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