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 1

The correct option is B 1, 2 and 3

Conditions to be satisfied for Regime as per Lacey are :
(i) Channel should flow uniformly in "incoherent unlimited alluvium" of same character as that transported by the water;
(ii) Silt grade-should be constant
(iii) Silt charge should be constant;
(iv) Discharge should be constant.
(v) Flow is uniform