Consider the following statements:
1. A regime channel will always have side slopes of value 0.5 H : 1 V
2. Lacey's regime formula is applicable to regime channels with sediment concentration more than 5000 ppm
3. For a Lacey's regime channel the Mannings roughness coefficient is estimated by strickler's formula
4. The measured velocity in a Lacey channel is proportional to R2/3 where R - hydraulic radius
Which of these statements are correct?
1
1 and 2
2
1 and 4
3
2 and 3
4
3 and 4