A rectangular open channel carries a discharge of $15 m^{3} / s$ when the depth of flow is 1.5 m and the bed slope is 1:1440. What will be the discharge through the channel at the same depth if the slope would have been 1:1000 ?

- 1
  
  $21.6 m^{3} / s$
- 2
  
  $18 m^{3} / s$
- 3
  
  $14.4 m^{3} / s$
- 4
  
  $12.5 m^{3} / s$

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