In an open channel of wide rectangular section with constant n value, the bed slope is $1.2 \times 10^{- 3}$ , the local friction slope at a section is $1.05 \times 10^{- 3}$ , the local Froude number of the flow is 0.8. The local rate of variation of depth with longitudinal distance along the flow direction is

- 1
  
  $\frac{1.2 - 1.05}{1 - 0.8} \times 10^{- 3}$
- 2
  
  $\frac{- 1.2 - 1.05}{1 - 0.8} \times 10^{- 3}$
- 3
  
  $\frac{1.2 + 1.05}{1 - 0.64} \times 10^{- 3}$
- 4
  
  $\frac{1.2 - 1.05}{1 - 0.64} \times 10^{- 3}$

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