Which of the following statements comparing Kennedy's and Lacey's silt theories is/are TRUE?
Options:
(A) Kennedy assumed that silt-supporting eddies are generated only from the bed of the channel
(B) Lacey considered silt-supporting eddies to be generated from the entire wetted perimeter (bed and sides)
(C) Lacey defined true regime, initial regime, and final regime states for alluvial channels
(D) Kennedy gave an independent regime equation for the longitudinal bed slope without needing Kutter's formula
Answer Key:
A, B, C
Step-by-Step Solution & Explanation
1. Kennedy considered eddies arising solely from horizontal channel bed (A is true).
2. Lacey recognized that eddies generate normal to all wetted boundaries (bed and sides) (B is true).
3. Lacey clearly categorized three regime conditions: true, initial, and final (C is true).
4. Kennedy did NOT provide a slope equation and had to rely on Kutter's formula with trial depths; Lacey developed independent regime equations for velocity, perimeter, hydraulic radius, and bed slope (D is false).