If a stream is carrying a discharge of 4.0 cumec per meter width having a silt factor 2.0, then the Lacey's scour depth will be

Question

Question

This question was previously asked in

BPSC AE Paper 6 (Civil) 14 Oct 2022 Official Paper

Answer 1

Concept:

Lacey's scour depth is given by:

Where, q = Discharge per meter width, f = silt factor

Calculations:

Given, q = 4 cumec, f = 2

Hence, the most appropriate answer is option 2.

Important Points

Various formulas deduced by lacey is given below:

1) silt factor ⇒

2) velocity of flow ⇒

3) hydraulic mean depth ⇒

4) wetted perimeter ⇒