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If D is the depth of scour below original bed, then the width of launching apron is generally taken as________________?

/ Irrigation, Water Resources Engineering and Hydrology / By
If D is the depth of scour below original bed, then the width of launching apron is generally taken as________________?

A. 1.2 D
B. 1.5 D
C. 2.0 D
D. 2.5 D