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Question
Lacey's scour depth for a stream, carrying a discharge of 3 cumecs per metre width and having a silt factor 1.2 is :
,d /kjk ds fy, yslh dh vfHklj.k xgjkbZ] ftldk fuLlj.k izfr ehVj pkSM+kbZ esa 3 D;wesDl gS rFkk ftldk xkn dkjd 1.2 gSA
A.
1.32 m
B.
2.64 m
C.
3.96 m
D.
4.32 m.
Answer ( Option B)

2.64 m

Solution

Lacey's scour depth is given by:
             
Where, q = Discharge per meter width, f = silt factor
    Calculations:
    Given, q = 3 cumec per meter width, f = 1.2
           

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