Consider the following statements for quasi-alluvial streams. i. The bed is not pitched and sides are banked with stable soils or pitching ii. The bridge span length is equal to the length of water line between banks measured along HFL iii. The stream is not contracted Which of the following statements are correct?

Consider the following statements for quasi-alluvial streams. i. The bed is not pitched and sides are banked with stable soils or pitching ii. The bridge span length is equal to the length of water line between banks measured along HFL iii. The stream is not contracted Which of the following statements are correct? Correct Answer i and ii

The stream is contracted so as to keep span length (L) lesser than the regime width (W) for the quasi-alluvial stream. The normal scour depth (D) is given by- D = D’ (W’/L)0.61 where W’ = the natural unobstructed width of the stream and D’ = the scour depth in the quasi-alluvial stream having L=W’.
Bissoy MCQ

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