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Question
The conditions to be satisfied for a channel in 'Regime' as per Lacey are
1. Constant discharge
2. Silt grade and silt concentration are constant
3. The channel is flowing in unlimited incoherent alluvium of the same alluvial character as that transported.
Which of the above statements are correct?
A.
1 and 2 only
B.
1, 2 and 3
C.
1 and 3 only
D.
2 and 3 only
Answer ( Option B)

1, 2 and 3

Solution

All three are the essential characteristics for the true regime condition according to lacey.
According to Laceys theory for True Regime condition
1. Discharge is constant.
2. Flow is uniform.
3. Silt charge is constant, i.e. amount of silt is constant.
4. Silt grade is constant, i,e. type and size of silt is always same.
5. Channel is flowing through incoherent alluvium, and it is of same grade which is transported.

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