Which of the following is the correct relation given by Lacey, for determining the silt factor in the design of irrigation channels?
1
1.76 × (Average particle size of alluvium in millimeter)0.64
2
1.76 × (Average particle size of alluvium in millimeter)2
3
1.76 × (Average particle size of alluvium in millimeter)1/6
4
1.76 × (Average particle size of alluvium in millimeter)1/2