In a straight reach of channel section, maximum velocity usually occurs below free surface at a depth of.
a.
0.75 to 0.85 of the total depth of flow
b.
0.50 to 0.75 of the total depth of flow
c.
0.25 to 0.50 of the total depth of flow
d.
0.05 to 0.15 of the total depth of flow
 Give two different versions of responses. Please separate the responses with 6 asterisk symbols: ******.
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