According to G.W. Pickles the effect of confining the flood water of a river between levee, is to increase A. Rate of flood wave B. Water surface elevation during floods C. Maximum discharge D. Surface slope of streams above the levied portion

The correct answer is: B. Water surface elevation during floods.

Levees are artificial embankments that are constructed along the banks of rivers to prevent flooding. When a river is confined by levees, the water is forced to flow through a smaller channel. This increases the water surface elevation during floods.

The other options are incorrect because:

• Option A: The rate of flood wave is not affected by
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  levees.
• Option C: The maximum discharge is not affected by levees.
• Option D: The surface slope of streams above the levied portion is not affected by levees.